1407952 20240223164619.0 oai:cds.cern.ch:1407952 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Bracco, C CERN CERN PS Not applicable Carli, C CERN Fowler, T CERN Goddard, B CERN AUTHOR|(CDS)2108505 #BEARD# Grawer, G CERN Lallement, J B CERN Martini, M CERN Weterings, W CERN CERN ARTICLE 000719801CER evelyne.delucinge@cern.ch CERN-ATS-2011-277 Linac4 will inject 160 MeV H- ions into the CERN PS Booster (PSB). This will allow to reduce space charge effects and increase beam intensity but will require a substantial upgrade of the injection region. The PSB has to provide beam to several users with different requirements in terms of beam intensity and emittance. Four kicker magnets (KSW) will be used to accomplish painting in the horizontal phase space to match the injected beams to the required emittances. Multiple linear functions, with varying slopes for each user, have been defined for the KSW generators waveforms according to detailed beam dynamic studies for all target intensities and emittances. Preliminary studies have been carried out to evaluate how to obtain the required vertical emittance and the option of a transverse painting, also in the vertical plane, is explored. CC-BY publication JACoW n 201151 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407952/files/CERN-ATS-2011-277.pdf http://cds.cern.ch/record/1407952/files/CERN-ATS-2011-277.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/THPS052.pdf Published version from JACoW Studies on Transverse Painting for H- Injection into the PSB 2011 Geneva CERN 01 Dec 2011 eng 13 1378144 THPS052 sansebastian20110904 PUBLIC 1407947 20240223164619.0 oai:cds.cern.ch:1407947 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper CERN ARTICLE CERN LHC Not applicable Alessio, F CERN AUTHOR|(CDS)2068847 #BEARD# Appleby, R B Manchester U. AUTHOR|(CDS)2108501 #BEARD# Bartmann, W CERN Baudrenghien, P CERN Boccone, V CERN Bracco, C CERN Brugger, M CERN Cornelis, K CERN Dehning, B CERN del Busto, E CERN Di Mauro, A CERN AUTHOR|(CDS)2051444 #BEARD# Drosdal, L CERN Höfle, W CERN Holzer, E B CERN Jacobsson, R CERN AUTHOR|(CDS)2067737 #BEARD# Kain, V CERN Meddahi, M CERN AUTHOR|(CDS)2051014 #BEARD# Mertens, V CERN Nordt, A CERN Uythoven, J CERN Valuch, D CERN Weisz, S CERN 000719798CER evelyne.delucinge@cern.ch CERN-ATS-2011-274 Losses at injection into the superconducting LHC can adversely affect the machine performance in several important ways. The high injected beam intensity and energy mean that precautions must be taken against damage and quenches, including collimators placed close to the beam in the injection regions. Clean injection is essential, to avoid spurious signals on the sensitive beam loss monitoring system which will trigger beam dumps. In addition, the use of the two injection insertions to house downstream high energy physics experiments brings constraints on permitted beam loss levels. In this paper the sources of injection beam loss are discussed together with the contributing factors and various issues experienced in the first full year of LHC operation. Simulations are compared with measurement, and the implemented and planned mitigation measures and diagnostic improvements are described. An outlook for future LHC operation is given. CC-BY publication JACoW n 201151 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407947/files/CERN-ATS-2011-274.pdf http://cds.cern.ch/record/1407947/files/CERN-ATS-2011-274.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/THPS055.pdf Published version from JACoW Controlling Beamloss at Injection into the LHC 2011 Geneva CERN 01 Dec 2011 eng Goddard, B CERN AUTHOR|(CDS)2108505 #BEARD# 13 1378144 THPS055 sansebastian20110904 PUBLIC 1407943 20240223164618.0 oai:cds.cern.ch:1407943 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Bartmann, W CERN RCS Not applicable Balhan, B CERN Borburgh, J CERN Ducimetière, L CERN Fitterer, M CERN Goddard, B CERN AUTHOR|(CDS)2108505 #BEARD# Sermeus, L CERN CERN ARTICLE 000719797CER evelyne.delucinge@cern.ch CERN-ATS-2011-273 Conceptual studies have been made for a 2 GeV RCS at CERN as a possible replacement of the four-ring PS Booster. The lattice design has to accommodate suitable straight sections for a 160 MeV H- charge exchange injection system, and for a 2 GeV fast extraction system. The design constraints for the injection and extraction systems are described, together with the proposed concepts and potential equipment limitations. CC-BY publication JACoW n 201151 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407943/files/CERN-ATS-2011-273.pdf http://cds.cern.ch/record/1407943/files/CERN-ATS-2011-273.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/THPS054.pdf Published version from JACoW Injection and Extraction Considerations for a 2 GeV RCS at CERN 2011 Geneva CERN 01 Dec 2011 eng 13 1378144 THPS054 sansebastian20110904 PUBLIC 1407941 20240223164618.0 oai:cds.cern.ch:1407941 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Hessler, C CERN Not applicable HiRadMat Arruat, M CERN Bauche, J CERN Bestmann, K CERN Blanco Sancho, J CERN Conan, N CERN Cornelis, K CERN Efthymiopoulos, I CERN AUTHOR|(CDS)2051410 #BEARD# Gaillard, H CERN Goddard, B CERN AUTHOR|(CDS)2108505 #BEARD# Grenier, D CERN Gros, G CERN Habert, A CERN Jensen, L CERN Kain, V CERN Le Godec, G CERN Meddahi, M CERN AUTHOR|(CDS)2051014 #BEARD# Pelletier, S CERN Pepinster, P CERN Puccio, B CERN Theis, C CERN Trilhe, P CERN Vandoni, G CERN Wenninger, J CERN CERN ARTICLE 000719794CER evelyne.delucinge@cern.ch CERN-ATS-2011-272 The High Radiation to Materials facility (HiRadMat) is a new experimental area at CERN, for studies of the impact of high-intensity pulsed beams on accelerator components and materials. The beam is delivered from the SPS by a new primary beam line, which has been constructed during the 2010/11 winter technical stop. The paper summarizes the construction phase and describes the results from the beam line commissioning in spring 2011. Beam parameter and aperture measurements are presented, as well as steering tests. A special emphasis has been put on the handling of the exceptionally flexible beam line optics in the control system. CC-BY publication JACoW n 201151 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407941/files/CERN-ATS-2011-272.pdf http://cds.cern.ch/record/1407941/files/CERN-ATS-2011-272.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/THPS053.pdf Published version from JACoW Results from the HiRadMat Primary Beam Line Commissioning 2011 Geneva CERN 01 Dec 2011 eng 13 1378144 THPS053 sansebastian20110904 PUBLIC 1407939 20240223164618.0 oai:cds.cern.ch:1407939 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Geneva CERN 01 Dec 2011 CERN PS Not applicable Aumon, S CERN Bartmann, W CERN Gilardoni, S CERN Goddard, B CERN AUTHOR|(CDS)2108505 #BEARD# Sermeus, L CERN Steerenberg, R CERN CERN ARTICLE 000719793CER evelyne.delucinge@cern.ch CERN-ATS-2011-271 In the framework of the planned CERN PS Booster (PSB) energy upgrade, a study was initiated to look into the possibilities and constraints to inject protons into the PS at kinetic energies up to 2 GeV, for LHC type beams and other (high intensity) beams. This paper highlights the identified bottlenecks and potential solutions and addresses the resulting requirements for the hardware in the transfer line and injection region of the PS. In conjunction with the proposed upgrade of the PSB-PS transfer line hardware the optics can be changed for different cycles. Optics solutions optimized for the different requirements of LHC type and other beams are presented. CC-BY publication JACoW n 201151 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407939/files/CERN-ATS-2011-271.pdf http://cds.cern.ch/record/1407939/files/CERN-ATS-2011-271.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/THPS049.pdf Published version from JACoW Feasibility Study of a CERN PS Injection at 2 GeV 2011 Borburgh, J CERN eng 13 1378144 THPS049 sansebastian20110904 PUBLIC 1407937 20240223164618.0 oai:cds.cern.ch:1407937 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Fowler, T CERN Kramer, T EBG MedAustron Prost, A CERN Stadlbauer, T EBG MedAustron Borburgh, J CERN Not applicable Not applicable CERN ARTICLE 000719792CER evelyne.delucinge@cern.ch CERN-ATS-2011-270 For the MedAustron facility under construction in Wiener Neustadt, three electric field deflectors are developed in collaboration with CERN. A fast deflector is used in the Low Energy Beam Transfer line to chop the beam. The chopped beam is swept onto a Faraday cup for measurement purposes and to stop beam being sent towards the synchrotron. For the multi-turn injection of protons and ions, as well as for the slow extraction from the synchrotron, electrostatic septa are used. A novel design for MedAustron includes an inversed cathode/anode support and high voltage feedthroughs rated for 150 kV. The possibility for a higher voltage will significantly improve the conditioning process of the septa surfaces. This paper describes the requirements of these devices as well as the mechanical design and strategies adopted for their power supplies. CC-BY publication JACoW n 201151 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407937/files/CERN-ATS-2011-270.pdf http://cds.cern.ch/record/1407937/files/CERN-ATS-2011-270.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/THPS048.pdf Published version from JACoW Design of Electrostatic Septa and Fast Deflector for MedAustron 2011 Geneva CERN 01 Dec 2011 eng 13 1378144 THPS048 sansebastian20110904 PUBLIC 1407936 20241025033908.0 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Faus-Golfe, A Valencia U., IFIC Barnes, M J CERN Rumolo, G CERN Zannini, C EPFL, Lausanne Toral, F Madrid, CIEMAT Belver-Aguilar, C Valencia U., IFIC CLIC Not applicable CERN ARTICLE 000719791CER evelyne.delucinge@cern.ch CERN-ATS-2011-269 The Compact Linear Collider (CLIC) study explores the scheme for an electron-positron collider with high luminosity and a nominal centre-of-mass energy of 3 TeV: CLIC will complement LHC physics in the multi-TeV range. The CLIC design relies on the presence of Pre-Damping Rings (PDR) and Damping Rings (DR) to achieve, through synchrotron radiation, the very low emittance needed to fulfill the luminosity requirements. The specifications for the kicker systems are very challenging and include very low beam coupling impedance and excellent field homogeneity: striplines have been chosen for the kicker elements. Analytical calculations have been carried out to determine the effect of tapering upon the high frequency beam coupling impedance. In addition detailed numerical modeling of the field homogeneity has been performed and the sensitivity of the homogeneity to various parameters, including stripline cross-section, have been studied. This paper presents the main conclusions of the beam impedance calculations and field homogeneity predictions. CC-BY publication JACoW CERN EDS CLAS1 CLIC-Note CLICARCHIVE n 201151 a2011 CLIC-Note-921 4 p ATS IPAC2011 C11-09-04 https://accelconf.web.cern.ch/IPAC2011/papers/TUPC011.pdf Published version from JACoW 633129 324570 http://cds.cern.ch/record/1407936/files/CERN-ATS-2011-269.pdf 800248 414248 http://cds.cern.ch/record/1407936/files/CLIC_note_921.pdf 633129 1706977 http://cds.cern.ch/record/1407936/files/CERN-ATS-2011-269.pdf?subformat=pdfa pdfa 800248 1743040 http://cds.cern.ch/record/1407936/files/CLIC_note_921.pdf?subformat=pdfa pdfa 800248 27600 http://cds.cern.ch/record/1407936/files/CLIC_note_921.gif?subformat=icon-700 icon-700 800248 6535 http://cds.cern.ch/record/1407936/files/CLIC_note_921.gif?subformat=icon icon Striplines for CLIC Pre-damping and Damping Rings oai:cds.cern.ch:1407936 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2011 Geneva CERN 01 Dec 2011 eng CERN Library CLIC-Note-0921 13 1378144 TUPC011 sansebastian20110904 PUBLIC 1407933 20241025033907.0 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Garion, C CERN CLIC Not applicable CERN ARTICLE 000719788CER evelyne.delucinge@cern.ch CERN-ATS-2011-268 The Compact LInear Collider, under study, is based on room temperature high gradient structures. The vacuum specificities of these cavities are low conductance, large surface areas and a non-baked system. The main issue is to reach UHV conditions (typically 10-7 Pa) in a system where the residual vacuum is driven by water outgassing. A finite element model based on an analogy thermal/vacuum has been built to estimate the vacuum profile in an accelerating structure. Vacuum tests are carried out in a dedicated set-up, the vacuum performances of different configurations are presented and compared with the predictions. CC-BY publication JACoW CERN EDS CLAS1 CLIC-Note CLICARCHIVE n 201151 a2011 CLIC-Note-924 4 p ATS IPAC2011 C11-09-04 https://accelconf.web.cern.ch/IPAC2011/papers/TUPS021.pdf Published version from JACoW 633128 1434583 http://cds.cern.ch/record/1407933/files/CERN-ATS-2011-268.pdf 800251 1520296 http://cds.cern.ch/record/1407933/files/CLIC_note_924.pdf 633128 2610672 http://cds.cern.ch/record/1407933/files/CERN-ATS-2011-268.pdf?subformat=pdfa pdfa 800251 20201 http://cds.cern.ch/record/1407933/files/CLIC_note_924.gif?subformat=icon-700 icon-700 800251 2648242 http://cds.cern.ch/record/1407933/files/CLIC_note_924.pdf?subformat=pdfa pdfa 800251 4850 http://cds.cern.ch/record/1407933/files/CLIC_note_924.gif?subformat=icon icon Simulations and Vacuum Tests of a CLIC Accelerating Structure oai:cds.cern.ch:1407933 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2011 Geneva CERN 01 Dec 2011 eng CERN Library CLIC-Note-0924 13 1378144 TUPS021 sansebastian20110904 PUBLIC 1407932 20240223164617.0 oai:cds.cern.ch:1407932 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Neupert, H CERN Taborelli, M CERN Störi, H TU Vienna Kuzucan, A CERN Not applicable Not applicable CERN ARTICLE 000719787CER evelyne.delucinge@cern.ch CERN-ATS-2011-267 Electron cloud is a serious limitation for the operation of particle accelerators with intense positively charged beams. It occurs if the secondary electron yield (SEY) of the beam-pipe surface is sufficiently high to induce an electron multiplication. At low surface temperatures, the SEY is strongly influenced by the nature of the physisorbed gases and by the corresponding surface coverage. These conditions occur in many accelerators operating with superconducting magnets and cold vacuum sections such as the LHC and RHIC. In this work, we investigated the variation of the SEY of copper, aluminium and electro-polished copper as a function of physisorbed N2, CO, CO2, CH4, Kr, C2H6 at cryogenic temperatures. The conditioning by electron bombardment of the surface after the physisorption of H2O on electro polished copper will also be presented. The results of the various gases are compared in order to find a rationale for the behaviour of the secondary electrons for the various adsorbates. CC-BY publication JACoW n 201151 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407932/files/CERN-ATS-2011-267.pdf http://cds.cern.ch/record/1407932/files/CERN-ATS-2011-267.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/TUPS023.pdf Published version from JACoW Secondary Electron Yield on Cryogenic Surfaces as a Function of Physisorbed Gases 2011 Geneva CERN 01 Dec 2011 eng 13 1378144 TUPS023 sansebastian20110904 PUBLIC 1407930 20240223164617.0 CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Chiggiato, P CERN Costa Pinto, P CERN Neupert, H CERN Rumolo, G CERN Shaposhnikova, E CERN Taborelli, M CERN Kato, S CERN Geneva CERN 01 Dec 2011 CERN SPS Not applicable CERN ARTICLE 000719786CER evelyne.delucinge@cern.ch CERN-ATS-2011-266 Amorphous carbon (a-C) coatings have been tested in electron cloud monitors (ECM) in the Super Proton Synchrotron (SPS) and have shown for LHC type beams a reduction of the electron cloud current by a factor 104 compared to stainless steel (StSt). This performance has been maintained for more than 3 years under SPS operation conditions. Secondary electron yield (SEY) laboratory data confirm that after more than 1 year of SPS operation, the coating maintains a SEY below 1.0. The compatibility of coexisting StSt and a-C surfaces has been studied in an ECM having coated and uncoated areas. The results show no degradation of the properties of the a-C areas. The performance of diamond like carbon (DLC) coating has also been studied. DLC shows a less effective reduction of the EC current than a-C, but conditioning is faster than for StSt. Three a-C coated dipoles were inserted in the SPS. However, even with no EC detected, the dynamic pressure rise is similar to the one observed in the StSt reference dipoles. Measurement in a new ECM equipped with clearing electrodes to verify the relation between pressure signals and intensity of the EC, as well as an improvement of the diagnostics in the dipoles are in progress. CC-BY publication JACoW n 201151 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407930/files/CERN-ATS-2011-266.pdf https://accelconf.web.cern.ch/IPAC2011/papers/TUPS028.pdf Published version from JACoW Performance of Carbon Coatings for Mitigation of Electron Cloud in the SPS oai:cds.cern.ch:1407930 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2011 Yin Vallgren, C CERN eng 13 1378144 TUPS028 sansebastian20110904 PUBLIC 1407929 20240223164617.0 oai:cds.cern.ch:1407929 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings Cruikshank, P CERN Faisandel, L CERN Maan, W CERN Hauser, T EBG MedAustron Hulla, G EBG MedAustron Landrot, P EBG MedAustron Wallner, J EBG MedAustron Jimenez, J M CERN Not applicable Not applicable 000719785CER ARTICLE ConferencePaper evelyne.delucinge@cern.ch n 201151 a2011 13 CERN-ATS-2011-265 The MedAustron beam vacuum system is a complex system integrating different technical solutions from the source to the patient treatment rooms. The specified vacuum performances combined with the challenging integration issues require technical compromise which will be presented in this poster. The status of the design of the vacuum system will be reviewed and the pending issues will be explained. CC-BY publication JACoW CERN ARTICLE 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407929/files/CERN-ATS-2011-265.pdf http://cds.cern.ch/record/1407929/files/CERN-ATS-2011-265.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/TUPS022.pdf Published version from JACoW MedAustron Beam Vacuum System: From Sources to Patient Treatment Rooms 2011 Geneva CERN 01 Dec 2011 eng 1378144 TUPS022 sansebastian20110904 PUBLIC 1407928 20240223164617.0 oai:cds.cern.ch:1407928 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings Claudet, S CERN Maan, M CERN Mourier, L CERN Perrier-Cornet, A CERN Provot, N CERN 000719784CER ARTICLE ConferencePaper evelyne.delucinge@cern.ch CERN-ATS-2011-264 The cold vacuum systems of the LHC machine have been in operation since 2008. While a number of acceptable helium leaks were known to exist prior to cool down and have not significantly evolved over the last years, several new leaks have occurred which required immediate repair activities or mitigating solutions to permit operation of the LHC. The LHC vacuum system is described together with a summary and timetable of known air and helium leaks and their impact on the functioning of the cryogenic and vacuum systems. Where leaks have been investigated and repaired, the cause and failure mechanism is described. We elaborate the mitigating solutions that have been implemented to avoid degradation of known leaks and minimize their impact on cryogenic operation and LHC availability, and finally a recall of the consolidation program to be implemented in the next LHC shutdown. CC-BY publication JACoW CERN ARTICLE CERN LHC Not applicable 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407928/files/CERN-ATS-2011-264.pdf http://cds.cern.ch/record/1407928/files/CERN-ATS-2011-264.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/TUPS020.pdf Published version from JACoW Leak Tightness of LHC Cold Vacuum Systems 2011 Geneva CERN 01 Dec 2011 eng Cruikshank, P CERN n 201151 a2011 13 1378144 TUPS020 sansebastian20110904 PUBLIC 1407927 20240223164617.0 oai:cds.cern.ch:1407927 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings Simmons, G Materion Electrofusion, Fremont Dorn, C Materion Electrofusion, Fremont Veness, R CERN 000719783CER ARTICLE ConferencePaper evelyne.delucinge@cern.ch n 201151 a2011 13 CERN-ATS-2011-263 Beryllium is the material of choice for the beam vacuum chambers around collision points in particle colliders due to a combination of transparency to particles, high specific stiffness and compatibility with ultra-high vacuum. New requirements for these chambers in the LHC experiments have driven the development of new methods for the manufacture of beryllium chambers. This paper reviews the requirements for experimental vacuum chambers. It describes the new beryllium technology adopted for the LHC and experience gained in the manufacture and installation. CC-BY publication JACoW CERN ARTICLE CERN LHC Not applicable 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407927/files/CERN-ATS-2011-263.pdf http://cds.cern.ch/record/1407927/files/CERN-ATS-2011-263.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/TUPS024.pdf Published version from JACoW Development of Beryllium Vacuum Chamber Technology for the LHC 2011 Geneva CERN 01 Dec 2011 eng 1378144 TUPS024 sansebastian20110904 PUBLIC 1407924 20240223164617.0 oai:cds.cern.ch:1407924 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings Schmidt, R CERN Todd, B CERN Uythoven, J CERN Zerlauth, M CERN 000719780CER ARTICLE ConferencePaper evelyne.delucinge@cern.ch CERN-ATS-2011-261 The operation of the LHC involves the risk of incidents leading to machine damage. In order to protect the investment of several billion CHF, a complex Machine Protection System (MPS) ensures safe LHC operation by reducing the risk for machine damage to an acceptable level. The protection system was designed based on a large number of possible failures of LHC equipment. So far, the knowledge of these failures, and the related machine protection functions implemented in the MPS, is distributed over the different teams involved in the design and operation of the LHC. A newly started project aims at bringing together this knowledge in a common failure catalogue. This paper introduces the approach and presents the first experience. CC-BY publication JACoW CERN ARTICLE CERN LHC Not applicable 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407924/files/CERN-ATS-2011-261.pdf http://cds.cern.ch/record/1407924/files/CERN-ATS-2011-261.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/WEPC174.pdf Published version from JACoW A Failure Catalogue for the LHC 2011 Geneva CERN 01 Dec 2011 eng Wagner, S CERN n 201151 a2011 13 1378144 WEPC174 sansebastian20110904 PUBLIC 1407922 20240223164617.0 CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Maglioni, C CERN Schmidt, R CERN Tahir, N A Darmstadt, GSI Blanco Sancho, J CERN CERN SPS HiRadMat CERN ARTICLE 000719778CER evelyne.delucinge@cern.ch CERN-ATS-2011-260 Calculations of the impact of dense high intensity proton beams into material has been presented in several papers [1,2,3]. This paper presents the plans for an experiment to validate the theoretical results. The experiment will be performed at the High Radiation to Materials (HiRadMat) facility at the CERN-SPS. The HiRadMat facility is dedicated to shock beam impact experiments. It allows testing of accelerator components, in particular those of LHC, to the impact of high-intensity pulsed beams. This facility will allow to study High Energy Density physics as the energy density will be high enough to create strongly coupled plasma in the core of high-Z materials (copper, tungsten) and to produce strong enough pressure waves to create a density depletion channel along the beam axis (tunneling effect) [4,5]. The paper introduces the layout of the experiment and the instrumentation to detect tunneling of protons through the target as well as the expected results based on simulations. CC-BY publication JACoW n 201151 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407922/files/CERN-ATS-2011-260.pdf http://cds.cern.ch/record/1407922/files/CERN-ATS-2011-260.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/TUPS070.pdf Published version from JACoW An Experiment at HiRadMat: Irradiation of high-Z Materials oai:cds.cern.ch:1407922 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2011 Geneva CERN 01 Dec 2011 eng 13 1378144 TUPS070 sansebastian20110904 PUBLIC 1407912 20240223164617.0 oai:cds.cern.ch:1407912 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings Kramer, T EBG MedAustron Stadlbauer, T EBG MedAustron Barnes, M J CERN Not applicable Not applicable 000719774CER ARTICLE ConferencePaper evelyne.delucinge@cern.ch n 201151 a2011 13 CERN-ATS-2011-258 The MedAustron facility, to be built in Wiener Neustadt (Austria), will provide protons and ions for both cancer therapy and research [1]. Different types of kicker magnets will be used in the facility. The kicker magnets are outside machine vacuum: each kicker magnet has a ceramic beam chamber whose inner surface is metalized. The resistivity and thickness of the metallization are chosen such that the induced eddy currents, resulting from the pulsed kicker magnetic field, do not unduly affect the rise/fall times or homogeneity of the magnetic field. A comparison of an analytical calculation and measurement is reported for the effect of metallization of a ceramic chamber in an existing kicker system at CERN. Conclusions concerning the metallization of the ceramic chambers for the MedAustron kicker magnets are presented. CC-BY publication JACoW CERN ARTICLE 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407912/files/CERN-ATS-2011-258.pdf http://cds.cern.ch/record/1407912/files/CERN-ATS-2011-258.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/THPO033.pdf Published version from JACoW Calculation of Metallization Resistivity and Thickness for MedAustron Kickers 2011 Geneva CERN 01 Dec 2011 eng 1378144 THPO033 sansebastian20110904 PUBLIC 1407911 20240223164617.0 oai:cds.cern.ch:1407911 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN INSPIRE 1183492 Inspire 1183492 CERN-ATS-2011-257 IPAC-2011-TUYA02 SzGeCERN Accelerators and Storage Rings Rossi, L CERN 000719773CER ARTICLE evelyne.delucinge@cern.ch n 201151 a2011 13 The LHC is performing very well, some design parameters have been quickly reached and even improved over design. CERN has recently organized a project, called High Luminosity LHC, regrouping all studies and hardware development needed to improve the luminosity performance of LHC, aiming to L=5 1034cm-2s-1, with luminosity levelling. This performance should enable to obtain about 250 fb-1 per year after 2022, to reach the goal of 3000 fb-1 for both ATLAS and CMS experiments. In the paper we will discuss the baseline plan for the lumi upgrade and the intial study for upgrading the collision energy, in the 27-33 TeV range. CC-BY-3.0 JACoW https://creativecommons.org/licenses/by/3.0/ CERN EDS CLAS1 CERN ARTICLE CERN LHC Not applicable 6 p ATS TUYA02 IPAC2011 C11-09-04 2011 http://cds.cern.ch/record/1407911/files/CERN-ATS-2011-257.pdf 633116 549250 http://cds.cern.ch/record/1407911/files/CERN-ATS-2011-257.pdf?subformat=pdfa pdfa 633116 1711270 https://accelconf.web.cern.ch/IPAC2011/papers/TUYA02.pdf Published version from JACoW LHC Upgrade Plans: Options and Strategy 2011 Geneva CERN 01 Dec 2011 eng 1378144 TUYA02 sansebastian20110904 PUBLIC 1407908 20240223164616.0 oai:cds.cern.ch:1407908 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Juchno, M EPFL, Lausanne CERN CERN PS Not applicable CERN ARTICLE 000719770CER evelyne.delucinge@cern.ch CERN-ATS-2011-255 The CERN Proton Synchrotron (PS) will remain one of the key elements of the Large Hadron Collider (LHC) injector system for the next 20-25 years. Tuning the machine characteristics to the requirements for the LHC and its upgrades will require the establishment of an accurate magnetic model of the PS combined-function magnets, which is the subject of this paper. In the scope of this research, a detailed 2D quasi-static analysis of the PS magnets was performed, which allowed to investigate the magnetic field evolution and the contribution of separate magnet circuits at different field levels. An experimental validation of this new model was carried out through ad-hoc field measurements machine studies iterated with an optical model of the PS machine to recreate the measured optical parameters of the beam. CC-BY publication JACoW n 201151 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407908/files/CERN-ATS-2011-255.pdf http://cds.cern.ch/record/1407908/files/CERN-ATS-2011-255.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/WEPO019.pdf Published version from JACoW Magnetic Model of the CERN Proton Synchrotron Main Magnetic Unit 2011 Geneva CERN 01 Dec 2011 eng 13 1378144 WEPO019 sansebastian20110904 PUBLIC 1407862 20240223164616.0 oai:cds.cern.ch:1407862 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings Charifoulline, Z CERN Dahlerup-Petersen, K CERN Schmidt, R CERN Siemko, A CERN Steckert, J CERN 000719764CER ARTICLE ConferencePaper evelyne.delucinge@cern.ch CERN-ATS-2011-254 The protection system for superconducting magnets and bus-bars is an essential part of the LHC machine protection and ensures the integrity of substantial elements of the accelerator. Due to the large amount of hardwired and software interlock channels the dependability of the system is a critical parameter for the successful operation of the LHC. CC-BY publication JACoW CERN ARTICLE CERN LHC Not applicable 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407862/files/CERN-ATS-2011-254.pdf http://cds.cern.ch/record/1407862/files/CERN-ATS-2011-254.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/TUPS071.pdf Published version from JACoW Performance of the Protection System for Superconducting Circuits during LHC Operation 2011 Geneva CERN 01 Dec 2011 eng Denz, R CERN n 201151 a2011 13 1378144 TUPS071 sansebastian20110904 PUBLIC 1407857 20241025034035.0 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Barnes, M J CERN Holma, J CERN CLIC Not applicable CERN ARTICLE 000719763CER evelyne.delucinge@cern.ch CERN-ATS-2011-253 The Compact Linear Collider (CLIC) study is exploring the scheme for an electron-positron collider with high luminosity and a nominal centre-of-mass energy of 3 TeV. The CLIC damping rings will produce ultra-low emittance beam, with high bunch charge, necessary for the luminosity performance of the collider. To limit the beam emittance blow-up due to oscillations, the pulse power modulators for the damping rings kickers must provide extremely flat, high-voltage, pulses: specifications call for a 160 ns duration flattop of 12.5 kV, 250 A, with a combined ripple and droop of not more than ±0.02 %. A solid-state modulator, the inductive adder, is a very promising approach to meeting the demanding specifications; this topology allows the use of both digital and analogue modulation. To effectively use modulation techniques to achieve such low ripple and droop requires an in-depth knowledge of the behaviour of the solid-state switching components and their gate drivers, as well as a good understanding of the overall circuit behaviour. This paper describes the initial design of the inductive adder. CC-BY publication JACoW CERN EDS CLAS1 CLIC-Note CLICARCHIVE n 201151 a2011 CLIC-Note-922 4 p ATS IPAC2011 C11-09-04 https://accelconf.web.cern.ch/IPAC2011/papers/THPO032.pdf Published version from JACoW 633112 279108 http://cds.cern.ch/record/1407857/files/CERN-ATS-2011-253.pdf 800249 322989 http://cds.cern.ch/record/1407857/files/CLIC_note_922.pdf 633112 1606704 http://cds.cern.ch/record/1407857/files/CERN-ATS-2011-253.pdf?subformat=pdfa pdfa 800249 1645097 http://cds.cern.ch/record/1407857/files/CLIC_note_922.pdf?subformat=pdfa pdfa 800249 26788 http://cds.cern.ch/record/1407857/files/CLIC_note_922.gif?subformat=icon-700 icon-700 800249 6184 http://cds.cern.ch/record/1407857/files/CLIC_note_922.gif?subformat=icon icon Preliminary Design of an Inductive Adder for CLIC Damping Rings oai:cds.cern.ch:1407857 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN 2011 Geneva CERN 01 Dec 2011 eng CERN Library CLIC-Note-0922 13 1378144 THPO032 sansebastian20110904 PUBLIC 1407856 20240223164616.0 CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Penacoba, G CERN Not applicable Not applicable Alvarez, P CERN Gousiou, E CERN Page, S CERN Palluel, J CERN Serrano, J CERN AUTHOR|(CDS)2069958 #BEARD# van der Bij, E CERN CERN ARTICLE 000719762CER evelyne.delucinge@cern.ch CERN-ATS-2011-252 CERN makes extensive use of the WorldFIP fieldbus interface in the LHC and other accelerators in the preinjectors chain. Following the decision of the provider of the components to stop the developments in this field and foreseeing the potential problems in the subsequent support, CERN decided to purchase the design information of these components and in-source the future developments using this technology. The first in-house design concerns a replacement for the MicroFIP chip whose last version was manufactured in an IC feature size found to be more vulnerable to radiation of high energy particles than the previous versions. NanoFIP is a CERN design based on a Flash FPGA implementing a subset of the functionality allowed by the communication standard, fitting the requirements of the different users and including the robustness against radiation as a design constraint. The development presented involved several groups at CERN working together in the framework of the Open Hardware Repository collaboration, and aiming at maximizing the interoperability and reliability of the final product. CC-BY-3.0 Publication n 201151 a2011 a2012 4 p ATS C03027 JINST 7 2012 IPAC2011 C11-09-04 http://cds.cern.ch/record/1407856/files/CERN-ATS-2011-252.pdf http://cds.cern.ch/record/1407856/files/CERN-ATS-2011-252.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/TUPS102.pdf Published version from JACoW http://cds.cern.ch/record/1407856/files/1748-0221_7_03_C03027.pdf IOP Open Access article Design of an FPGA-based Radiation Tolerant Agent for Worldfip Fieldbus DOI 10.1088/1748-0221/7/03/C03027 oai:cds.cern.ch:1407856 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN Inspire 1112648 2011 2012 Geneva CERN 01 Dec 2011 eng 13 1378144 TUPS102 sansebastian20110904 1354958 C03027 vienna20110926 PUBLIC 1407851 20240223164616.0 oai:cds.cern.ch:1407851 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings ARTICLE ConferencePaper Crettiez, O CERN Newborough, A CERN Vanherpe, L CERN Vorozhtsov, A Dubna, JINR Zickler, T CERN Borgnolutti, F CERN CERN Linac4 Not applicable CERN ARTICLE 000719760CER evelyne.delucinge@cern.ch CERN-ATS-2011-250 Linac4 is a new H- linear accelerator at CERN replacing Linac2 as injector to the PS Booster. Almost 100 electro-magnets of different types are needed for the Linac4 project. Following a detailed analysis of the requirements and constraints, several magnet designs have been studied and are well advanced. This paper presents the design considerations, main parameters and characteristics of the new Linac4 magnets and summarizes the present status. CC-BY publication JACoW n 201151 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407851/files/CERN-ATS-2011-250.pdf http://cds.cern.ch/record/1407851/files/CERN-ATS-2011-250.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/WEPO018.pdf Published version from JACoW Status of the new Linac4 Magnets at CERN 2011 Geneva CERN 01 Dec 2011 eng 13 1378144 WEPO018 sansebastian20110904 PUBLIC 1407547 20240223164615.0 oai:cds.cern.ch:1407547 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings Bernhard, A KIT, Karlsruhe Rossmanith, R KIT, Karlsruhe Schoerling, D CERN Peiffer, P KIT, Karlsruhe Not applicable Not applicable 000719755CER ARTICLE ConferencePaper evelyne.delucinge@cern.ch n 201150 a2011 13 CERN-ATS-2011-248 CERN ARTICLE 4 p Undulators dedicated to low energy electron beams, like Laser Wakefield Accelerators, require very short period lengths to achieve X-ray emission. However, at these short period length (LambdaU ~ 5 mm) it becomes difficult to reach magnetic field amplitudes that lead to a K parameter of >1, which is generally desired. Room temperature permanent magnets and even superconductive undulators using Nb-Ti as conductor material have proven insufficient to achieve the desired field amplitudes. The superconductor Nb$_{3}$Sn has the theoretical potential to achieve the desired fields. However, up to now it is limited by several technological challenges to much lower field values than theoretically predicted. An alternative idea for higher fields is to manufacture the poles of the undulator body from Holmium instead of iron or to use Nb-Ti wires with a higher superconductor/copper ratio. The advantages and challenges of the different options are compared in this contribution. CC-BY publication JACoW ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407547/files/CERN-ATS-2011-248.pdf http://cds.cern.ch/record/1407547/files/CERN-ATS-2011-248.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/THPC158.pdf Published version from JACoW Field Optimization for short Period Undulators 2011 Geneva CERN 01 Dec 2011 eng 1378144 THPC158 sansebastian20110904 PUBLIC 1407543 20240223164615.0 oai:cds.cern.ch:1407543 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings Bouzoud, A CERN Delruelle, N CERN Gayde, J C CERN Leclercq, Y CERN Pasini, M CERN Tock, J P CERN Vandoni, G CERN 000719754CER ARTICLE ConferencePaper evelyne.delucinge@cern.ch CERN-ATS-2011-247 The major upgrade of the energy and intensity of the existing ISOLDE and REX-ISOLDE facilities at CERN will require the replacement of most of the existing ISOLDE post-acceleration by a superconducting linac based on quarter-wave resonators. The first stage of this upgrade involves the design, construction, installation and commissioning of two high- cryomodules downstream of REX, the existing post-accelerator. Each cryomodule houses five high-beta superconducting cavities and one superconducting solenoid. As well as providing optimum conditions for physics, where the internal active components must remain aligned within tight tolerances, the cryomodules need to function under stringent vacuum and cryogenic conditions. To preserve the RF cavity performance their assembly and sub-system testing will need to be carried out using specifically designed tooling in an ISO class 5 (US Fed. class 100) clean-room. We present the determining factors constraining the design of the high-beta cryomodules together with the design choices that these factors have imposed. CC-BY publication JACoW CERN ARTICLE CERN ISOLDE ISOL CERN HIE-ISOLDE 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407543/files/CERN-ATS-2011-247.pdf https://accelconf.web.cern.ch/IPAC2011/papers/MOPC105.pdf Published version from JACoW Design of the High Beta Cryomodule for the HIE-ISOLDE Upgrade at CERN 2011 Geneva CERN 01 Dec 2011 eng Williams, L CERN n 201150 a2011 13 1378144 MOPC105 sansebastian20110904 PUBLIC 1407542 20240223164615.0 oai:cds.cern.ch:1407542 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings Not applicable Not applicable Calatroni, S CERN Costa Pinto, P CERN Kuzucan, A CERN Neupert, H CERN Taborelli, M CERN 000719753CER ARTICLE ConferencePaper evelyne.delucinge@cern.ch CERN-ATS-2011-246 Amorphous carbon (a-C) coatings can reliably be produced with a maximum secondary electron yield (SEY) close to 1 at room temperature. Measurements at low temperature (LHe) are in progress. Analysis by X-ray Photoemission Spectroscopy (XPS) shows a correlation between the lineshape of C1s spectrum in XPS and the maximum SEY of the investigated samples. The initial level of oxygen on the surface of the various samples does not seem to be related to the initial maximum SEY value. However, the increase of the SEY with air exposure time on each individual sample is related to the amount of oxygen containing adsorbates. Storage in different environments has been investigated (static vacuum, aluminium foil, dry nitrogen and desiccators), and shows significant differences in the “aging” behaviour. Aging is very moderate when storing samples wrapped in aluminium foil in air. Samples which have undergone aging due to inappropriate storage can be recovered nearly to the initial value of their SEY by surface treatments such as conditioning by electron beam, annealing under vacuum and ion bombardment. However, an enhanced sensitivity to air exposure is observed for most of these curing methods. CC-BY publication JACoW CERN ARTICLE 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407542/files/CERN-ATS-2011-246.pdf http://cds.cern.ch/record/1407542/files/CERN-ATS-2011-246.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/TUPS027.pdf Published version from JACoW Characterization of Carbon Coatings with Low Secondary Electron Yield 2011 Geneva CERN 01 Dec 2011 eng Yin Vallgren, C CERN n 201150 a2011 13 1378144 TUPS027 sansebastian20110904 PUBLIC 1407539 20240223164615.0 oai:cds.cern.ch:1407539 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN Inspire 1183300 CERN-ATS-2011-245 IPAC-2011-TUPS019 SzGeCERN Accelerators and Storage Rings Bregliozzi, G CERN Jimenez, J M CERN Lanza, G CERN 000719752CER ARTICLE ConferencePaper evelyne.delucinge@cern.ch CERN is currently operating the Large Hadron Collider (LHC) with 3.5 TeV per beam. At this energy level, when the protons trajectory is bent, the protons emit synchrotron radiation (SR) with a critical energy of 5.5 eV. Under operation, SR induced molecular desorption is routinely observed in the LHC arcs, long straight sections and experiments. This contribution recalls the SR parameters over the LHC ring for the present and nominal beam parameters. Vacuum observations during energy ramp, after accumulation of dose and along the LHC ring are discussed. Expected pressure profiles and long term behaviours of vacuum levels will be also addressed. publication CC-BY JACoW CERN EDS CLAS1 CERN ARTICLE CERN LHC Not applicable 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407539/files/CERN-ATS-2011-245.pdf http://cds.cern.ch/record/1407539/files/CERN-ATS-2011-245.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/TUPS019.pdf Published version from JACoW Synchrotron Radiation in the LHC Vacuum System 2011 Geneva CERN 01 Dec 2011 eng Baglin, V CERN n 201150 a2011 13 1378144 TUPS019 sansebastian20110904 PUBLIC 1407538 20240223164614.0 oai:cds.cern.ch:1407538 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings Veness, R CERN 000719751CER ARTICLE ConferencePaper evelyne.delucinge@cern.ch n 201151 a2011 13 CERN-ATS-2011-244 The apertures for the vacuum chambers at the interaction points inside the LHC experiments are key both to the safe operation of the LHC machine and to obtaining the best physics performance from the experiments. Following the successful start-up of the LHC physics programme the ALICE, ATLAS and CMS experiments have launched projects to improve physics performance by adding detector layers closer to the beam. To achieve this they have requested smaller aperture vacuum chambers to be installed. The first periods of LHC operation have yielded much information both on the performance of the LHC and the stability and alignment of the experiments. In this paper, the new information relating to the aperture of these chambers is presented and a summary is made of analysis of parameters required to safely reduce the vacuum chambers apertures for the high-luminosity experiments ATLAS and CMS. CC-BY publication JACoW CERN ARTICLE CERN LHC Not applicable Assmann, R W CERN Ball, A CERN Behrens, A CERN Bracco, C CERN Bregliozzi, G CERN Bruce, R CERN AUTHOR|(CDS)2068843 #BEARD# Burkhardt, H CERN Corti, G CERN AUTHOR|(CDS)2067745 #BEARD# Gallilee, M A CERN Giovannozzi, M CERN Goddard, B CERN AUTHOR|(CDS)2108505 #BEARD# Mounet, N EPFL, Lausanne Mergelkuhl, D CERN Nessi, M CERN AUTHOR|(CDS)2067229 #BEARD# Riegler, W CERN AUTHOR|(CDS)2067623 #BEARD# Salvant, B EPFL, Lausanne Wenninger, J CERN 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1407538/files/CERN-ATS-2011-244.pdf http://cds.cern.ch/record/1407538/files/CERN-ATS-2011-244.pdf?subformat=pdfa pdfa https://accelconf.web.cern.ch/IPAC2011/papers/TUPS026.pdf Published version from JACoW Specification of new Vacuum Chambers for the LHC Experimental Interactions 2011 Geneva CERN 01 Dec 2011 eng 1378144 TUPS026 sansebastian20110904 PUBLIC 1379150 20240223164507.0 oai:cds.cern.ch:1407950 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN ARTICLE ConferencePaper Baer, T CERN Hamburg U. CERN ARTICLE CERN LHC Barnes, M CERN Goddard, B CERN AUTHOR|(CDS)2108505 #BEARD# Holzer, E B CERN Jimenez, J M CERN Lechner, V CERN Mertens, V CERN Nebot Del Busto, E CERN Nordt, A CERN Uythoven, J CERN Velghe, B CERN Wenninger, J CERN Zimmermann, F CERN AUTHOR|(CDS)2067941 #BEARD# 000719800CER 000716861CER flora.meric@cern.ch evelyne.delucinge@cern.ch CERN-ATS-2011-276 CERN-ATS-2011-051 One of the major known limitations for the performance of the Large Hadron Collider are so called UFOs (Unidentified Falling Objects). UFOs were first observed in July 2010 and caused numerous protection beam dumps since then. They are presumably micrometer sized dust particles that lead to fast beam losses with a duration of about 10 turns when they interact with the beam. In 2011, the diagnostics for such events are highly increased which allows estimations of the properties, dynamics and production mechanisms of the dust particles. The state of knowledge and mitigation strategies are presented. CC-BY publication JACoW CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings SzGeCERN Engineering n 201135 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1379150/files/CERN-ATS-2011-051.pdf https://accelconf.web.cern.ch/IPAC2011/papers/TUPC137.pdf Published version from JACoW http://cds.cern.ch/record/1379150/files/CERN-ATS-2011-276.pdf Fulltext UFOs in the LHC 2011 Geneva CERN 01 Sep 2011 eng 13 1378144 TUPC137 sansebastian20110904 PUBLIC 1381514 20241204055343.0 oai:cds.cern.ch:1407948 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN arXiv oai:arXiv.org:1110.2024 Inspire 931385 arXiv arXiv:1110.2024 physics.acc-ph IPAC-2011-MOPS078 LANL EDS CERN EDS CLAS1 1389335 Not applicable Not applicable 000719799CER 000717224CER ARTICLE ConferencePaper flora.meric@cern.ch evelyne.delucinge@cern.ch CC-BY publication JACoW SzGeCERN Accelerators and Storage Rings SzGeCERN Engineering CERN ARTICLE n 201137 a2011 13 Geneva CERN 11 Oct 2011 3 p Fast kicker magnets are used to inject beam into and eject beam out of the CERN accelerator rings. These kickers are generally transmission line type magnets with a rectangular shaped aperture through which the beam passes. Unless special precautions are taken the impedance of the yoke can provoke significant beam induced heating, especially for high intensities. In addition the impedance may contribute to beam instabilities. The results of longitudinal and transverse impedance measurements, for various kicker magnets, are presented and compared with analytical calculations: in addition predictions from a numerical analysis are discussed. arXiv Fast kicker magnets are used to inject beam into and eject beam out of the CERN accelerator rings. These kickers are generally transmission line type magnets with a rectangular shaped aperture through which the beam passes. Unless special precautions are taken the impedance of the yoke can provoke significant beam induced heating, especially for high intensities. In addition the impedance may contribute to beam instabilities. The results of longitudinal and transverse impedance measurements, for various kicker magnets, are presented and compared with analytical calculations: in addition predictions from a numerical analysis are discussed. ATS IPAC2011 C11-09-04 http://accelconf.web.cern.ch/IPAC2011/papers/MOPS078.PDF Full-text at JACoW Server 2438575 293911 http://cds.cern.ch/record/1381514/files/arXiv:1110.2024.pdf 627186 497691 http://cds.cern.ch/record/1381514/files/CERN-ATS-2011-100.pdf 644716 491701 http://cds.cern.ch/record/1381514/files/CERN-ATS-2011-275.pdf Fulltext Coaxial wire measurements of ferrite kicker magnets 2011 eng Day, Hugo CERN Manchester U. Cockcroft Inst. Accel. Sci. Tech. 1378144 MOPS078 sansebastian20110904 PUBLIC LANL EDS physics.acc-ph Barnes, Michael CERN Caspers, Fritz CERN Metral, Elias CERN Salvant, Benoit CERN Zannini, Carlo CERN Jones, Roger Manchester U. Cockcroft Inst. Accel. Sci. Tech. 1383810 20240223164537.0 oai:cds.cern.ch:1407925 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings SzGeCERN Accelerators and Storage Rings SzGeCERN EXPT louise.leduc@cern.ch LHCb-PROC-2011-048 CERN-ATS-2011-262 CERN LHC LHCb Corti, G CERN AUTHOR|(CDS)2067745 #BEARD# Veness, R CERN CERN INTNOTE PUBLLHCB INTNOTELHCBPROCPUBL ARTICLE 000719781CER 000717518CER ConferencePaper ARTICLE INTNOTELHCBPROCPUBL anu.liisa.saarelainen@cern.ch evelyne.delucinge@cern.ch The beam vacuum chamber in the LHCb experimental area passes through the centre of a large aperture dipole magnet. The vacuum chamber and all its support systems lie in the acceptance of the detector, so must be highly optimised for transparency to particles. As part of the upgrade programme for the LHCb vacuum system, the support system has been re-designed using advanced lightweight materials. In this paper we discuss the physics motivation for the modifications, the criteria for the selection of materials and tests performed to qualify them for the particular environment of a particle physics experiment. We also present the design of the re-optimised support system. CC-BY-4.0 Preprint n 201138 a2011 Linked to Poster-2011-196 CERN-LHCb-PROC-2011-048 Geneva CERN 20 Sep 2011 3 p PH-EP ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1383810/files/LHCb-PROC-2011-048.pdf https://accelconf.web.cern.ch/IPAC2011/papers/TUPS025.pdf Published version from JACoW http://cds.cern.ch/record/1383810/files/CERN-ATS-2011-262.pdf Fulltext Design of a Highly Optimised Vacuum Chamber Support for the LHCb Experiment 2011 Leduc, L CERN eng public 13 1378144 TUPS025 sansebastian20110904 PUBLIC 1379899 20240223164517.0 oai:cds.cern.ch:1407913 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS UNCL ARTICLE ConferencePaper Stadlbauer, T EBG MedAustron, Wr. Neustadt Barnes, M J CERN Benedikt, M CERN Fowler, T CERN Kramer, T EBG MedAustron, Wr. Neustadt CERN ARTICLE 000719775CER 000717020CER flora.meric@cern.ch evelyne.delucinge@cern.ch CERN-ATS-2011-259 CERN-ATS-2011-076 The MedAustron facility, to be built in Wiener Neustadt (Austria), will provide protons and ions for both cancer therapy and research [1]. Different types of kicker magnets will be used in the accelerator complex, including fast beam chopper dipoles: these allow the beam to be switched on and off for routine operational reasons or in case of emergency. Main requirements for the beam chopper system are safety and reliability. A criticality analysis, to chart the probability of failure modes against the severity of their consequences of the fault, has been carried out for the chopper dipole system. This "Failure Mode, Effects, and Criticality Analysis" (FMECA), has been used to highlight failure modes with relatively high probability and severity of consequences: conservative ratings of critical components and appropriate redundancy, together with measurements and interlocks, have been used to reduce the probability and criticality of faults. This paper gives an overview of the Risk Assessment approach and presents results of the FMECA. CC-BY publication JACoW SzGeCERN Accelerators and Storage Rings SzGeCERN Engineering n 201136 a2011 3 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1379899/files/CERN-ATS-2011-076.pdf 626880 454785 https://accelconf.web.cern.ch/IPAC2011/papers/THPO022.pdf Published version from JACoW Risk Assessment of the Chopper Dipole Kicker Magnets for the MedAustron Facility 2011 Geneva CERN 06 Sep 2011 eng 13 1378144 THPO022 sansebastian20110904 PUBLIC 1428907 20241025034121.0 ARTICLE ConferencePaper Vorozhtsov, Alexey Dubna, JINR CERN Modena, Michele CERN CLIC Not applicable EuCARD EuCARDCON ARTICLE CERN michele.modena@cern.ch evelyne.delucinge@cern.ch EuCARD-CON-2011-045 CERN-ATS-2011-256 R&D Magnets activities for CLIC Project have now entered a new phase with the design & manufacturing of several prototypes investigating the most challenging aspects of the Project. As concerning the CLIC magnet system, challenges can be related to pure technical aspects (e.g. the Final Focus QD0 quadrupole where a gradient of more than 550 T/m is requested) or to industrial production choices (e.g. the main beam quadrupoles where compactness and high tolerances are requested for the mechanical assembly, or the drive beam quadrupoles where a production of more than 40000 units is needed). In this paper the key aspects of the magnets presently under study such as the main beam, drive beam and final focus quadrupoles will be presented and discussed. Available results on prototypes and measured performances will also be addressed. SzGeCERN Accelerators and Storage Rings EuCARD 9: Technology for normal conducting higher energy linear accelerators SzGeCERN Engineering EuCARD 9.3: Linac & FF Stabilization n 201210 a2011 CLIC-Note-923 ATS IPAC2011 C11-09-04 https://accelconf.web.cern.ch/IPAC2011/papers/WEPO017.pdf Published version from JACoW 800250 1232677 http://cds.cern.ch/record/1428907/files/CLIC_note_923.pdf 636025 1884004 http://cds.cern.ch/record/1428907/files/EuCARD-CON-2011-045.pdf?subformat=pdfa pdfa 636025 642252 http://cds.cern.ch/record/1428907/files/EuCARD-CON-2011-045.pdf Access to fulltext document 641553 1150607 http://cds.cern.ch/record/1428907/files/CERN-ATS-2011-256.pdf Fulltext 800250 1862055 http://cds.cern.ch/record/1428907/files/CLIC_note_923.pdf?subformat=pdfa pdfa 800250 23274 http://cds.cern.ch/record/1428907/files/CLIC_note_923.gif?subformat=icon-700 icon-700 800250 5413 http://cds.cern.ch/record/1428907/files/CLIC_note_923.gif?subformat=icon icon Status of CLIC Magnets Studies oai:cds.cern.ch:1407909 cerncds:FULLTEXT cerncds:EuCARD cerncds:CERN:FULLTEXT cerncds:CERN 2011 Geneva CERN 01 Dec 2011 eng CERN Library CLIC-Note-0923 13 1378144 WEPO017 sansebastian20110904 PUBLIC FP7 227579 EUCARD openAccess CC-BY publication JACoW CERN EDS CLAS1 CLIC-Note CLICARCHIVE 1379888 20240223164516.0 oai:cds.cern.ch:1407854 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN CERN EDS CLAS1 ARTICLE ConferencePaper Siedler, C EBG MedAustron, Wr. Neustadt Stockner, M EBG MedAustron, Wr. Neustadt Zickler, T CERN Langenbeck, B EBG MedAustron, Wr. Neustadt Not applicable Not applicable CERN ARTICLE 000717011CER flora.meric@cern.ch evelyne.delucinge@cern.ch CERN-ATS-2011-251 CERN-ATS-2011-071 MedAustron, a future centre for ion-therapy and research in Austria will comprise an accelerator facility based on a synchrotron for the delivery of protons and light ions for cancer treatment and for clinical and nonclinical research [1]. The main dipole for the synchrotron went through an extensive design process to meet the stringent requirements. The local and integrated field quality was optimized. The residual field levels in the magnet gap were calculated and the dynamic behaviour of the dipole magnet was studied, both in 2D and 3D, using OPERA. The pole profile has been optimized to reduce sextupolar components in the integrated field by adjusting the shims on the pole edge. A Rogowski-profile at the pole ends and the use of stainless-steel tension straps shall enhance the dynamic behaviour and guarantee a small time constants. Appropriate pole-end shimming will be used to compensate for residual multi-pole components and to fine-tune the magnetic length. The results of this comprehensive design study are summarized in this paper. CC-BY publication JACoW SzGeCERN Accelerators and Storage Rings SzGeCERN Engineering n 201136 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1379888/files/CERN-ATS-2011-071.pdf https://accelconf.web.cern.ch/IPAC2011/papers/WEPO001.pdf Published version from JACoW http://cds.cern.ch/record/1379888/files/CERN-ATS-2011-251.pdf Fulltext Design and Optimization of the MedAustron Synchrotron Main Dipoles 2011 Geneva CERN 06 Sep 2011 eng 13 1378144 WEPO001 sansebastian20110904 PUBLIC 1382103 20240223164535.0 oai:cds.cern.ch:1407849 cerncds:FULLTEXT cerncds:CERN:FULLTEXT cerncds:CERN ARTICLE ConferencePaper Geneva CERN 14 Sep 2011 CERN ARTICLE CERN LHC Aquilina, N CERN Fiscarelli, L CERN Giovannozzi, M CERN Hagen, P CERN Lamont, M CERN Montenero, G CERN Steinhagen, R CERN Strzelczyk, M CERN Todesco, E CERN AUTHOR|(CDS)2108516 #BEARD# Tomas, R CERN Venturini Delsolaro, W CERN Wenninger, J CERN 000719759CER 000717364CER flora.meric@cern.ch evelyne.delucinge@cern.ch CERN-ATS-2011-249 CERN-ATS-2011-173 The Field Description of the Large Hadron Collider (FiDeL) model is a set of semi-empirical equations linking the magnets behaviours established from magnetic measurements to the magnetic properties of the machine observed through beam measurements. The FiDeL model includes the parameterization of static and dynamic (time dependent) components. In the present paper, we outline the relationship between the beam observables (orbit, tune, chromaticity) and the model components during the commissioning to higher beam intensities in 2010-2011, with energy of 3.5 TeV per beam. The main relevant issues are (i) the operation at 10 A/s ramp rate and their influence on chromatic correction, (ii) the beta beating and its relation to the quadrupoles transfer functions and (iii) the origin of the observed tune decay at injection. CC-BY publication JACoW CERN EDS CLAS1 SzGeCERN Accelerators and Storage Rings SzGeCERN Engineering n 201137 a2011 4 p ATS IPAC2011 C11-09-04 http://cds.cern.ch/record/1382103/files/CERN-ATS-2011-173.pdf https://accelconf.web.cern.ch/IPAC2011/papers/WEPO031.pdf Published version from JACoW http://cds.cern.ch/record/1382103/files/CERN-ATS-2011-249.pdf Fulltext The Magnetic Model of the LHC during Commissioning to higher Beam Intensities in 2010-2011 2011 Deniau, L CERN eng CERN 13 1378144 WEPO031 sansebastian20110904 PUBLIC