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1.
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Design, Manufacturing and Testing of the CTF3 Tail Clipper Kicker
/ Barnes, M J (CERN) ; Fowler, T (CERN) ; Ravida, G (CERN) ; Rodriguez, I (Madrid, CIEMAT) ; Toral, F (Madrid, CIEMAT)
The goal of the present CLIC Test Facility (CTF3) is to demonstrate the technical feasibility of specific key issues of the CLIC scheme. The extracted drive beam from the combiner ring (CR), a pulse of 35 A magnitude and 140 ns duration, is sent to the new CLic EXperimental area (CLEX). [...]
CERN-ATS-2010-163; CLIC-Note-852.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPD087
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2.
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First Magnetic Tests of a Superconducting Damping Wiggler for the CLIC Damping Rings
/ Schoerling, D (CERN) ; Ams, A (T.U. Bergakademie Freiberg) ; Bernhard, A (Karlsruhe, Inst. Technol.) ; Karppinen, M (CERN) ; Maccaferri, R (CERN) ; Peiffer, P (Karlsruhe, Inst. Technol.) ; Rossmanith, R (Karlsruhe, Inst. Technol.)
Each of the proposed CLIC electron and positron damping rings will be equipped with 76 wigglers. The length of each wiggler is 2 m, the period length lambda 40 to 50 mm, and the beam-stay-clear gap 13 mm. [...]
CERN-ATS-2010-162; CLIC-Note-853.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPD039
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3.
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CLIC Pre-damping and Damping Ring Kickers: Initial Ideas to Achieve Stability Requirements
/ Barnes, M J (CERN) ; Ducimetière, L (CERN) ; Uythoven, J (CERN)
The Compact Linear Collider (CLIC) study is exploring the scheme for an electron-positron collider with high luminosity (1034-1035 cm-2s-1) and a nominal centre-of mass energy of 3 TeV: CLIC would 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 the very low emittance, through synchrotron radiation, needed for the luminosity requirements of CLIC. [...]
CERN-ATS-2010-161; CLIC-Note-854.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPD089
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4.
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The Magnetic Model of the LHC in the Early Phase of Beam Commissioning
/ Todesco, E (CERN) ; Aquilina, N (CERN) ; Auchmann, B (CERN) ; Bottura, L (CERN) ; Buzio, M (CERN) ; Chritin, R (CERN) ; Deferne, G (CERN) ; Deniau, L (CERN) ; Fiscarelli, L (CERN) ; Hagen, P (CERN) et al.
The relation between field and current in each family of the Large Hadron Collider magnets is modelled with a set of empirical equations (FiDeL) whose free parameters are fit on magnetic measurements. They take into account residual magnetization, persistent currents, hysteresis, saturation, decay and snapback during initial part of the ramp. [...]
CERN-ATS-2010-154.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOOCRA01
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6.
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Measurement and Scaling Laws of the Sextupole Component in the LHC Dipole Magnets
/ Walckiers, L (CERN) ; Arpaia, P (Sannio U. ; CERN) ; Bottura, L (CERN) ; Buzio, M (CERN) ; Dunkel, O (CERN) ; Fiscarelli, L (Sannio U. ; CERN) ; Montenero, G (Sannio U. ; CERN) ; Garcia Perez, J (CERN) ; Todesco, E (CERN)
One of the main requirements for the magnet operation of the Large Hadron Collider at CERN is the correction of the dynamic multipole errors produced. In particular, integrated sextupole errors in the main dipoles must be kept well below 0.1 units to ensure acceptable chromaticity. [...]
CERN-ATS-2010-149.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPEB018
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7.
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Towards a Consolidation of LHC Superconducting Splices for 7 TeV Operation
/ Bertinelli, F (CERN) ; Catalan Lasheras, N (CERN) ; Fessia, P (CERN) ; Garion, C (CERN) ; Mathot, S (CERN) ; Perin, A (CERN) ; Scheuerlein, C (CERN) ; Sgobba, S (CERN) ; ten Kat, H (CERN) ; Tock, J P (CERN) et al.
Following the analysis of the September 2008 LHC incident, the assembly process and the quality assurance of the main 13 kA interconnection splices were improved, with new measurement and diagnostics methods introduced. During the 2008-2009 shutdown ~5% of these 10 000 splices were newly assembled with these improvements implemented, but essentially maintaining the original design. [...]
CERN-ATS-2010-144.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPEB042
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8.
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Mobile CT-System for In-situ Inspection in the LHC at CERN
/ Sauerwein, C (RayScan Technologies GmbH) ; Williams, L R (CERN) ; Caspers, F (CERN) ; Dalin, J M (CERN) ; Haemmerle, V (RayScan Technologies GmbH) ; Tiseanu, I (RayScan Technologies GmbH) ; Tock, J P (CERN)
For the inspection of certain critical elements of the LHC machine a mobile computed tomography system has been developed and built. This instrument has to satisfy stringent space, volume and weight requirements in order to be transportable and usable to any interconnection location in the LHC tunnel. [...]
CERN-ATS-2010-194; CERN-ATS-2010-143.-
Geneva : CERN, 2010 - 4 p.
Fulltext (CERN-ATS-2010-143): PDF; Fulltext (CERN-ATS-2010-194): PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPEB076
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9.
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Development of Upgraded Magnetic Instrumentation for CERN Real-Time Reference Field Measurement Systems
/ Buzio, M (CERN) ; Beaumont, A (Fachhochsch., Wiener Neustadt) ; Galbraith, P (CERN) ; Golluccio, G (CERN) ; Giloteaux, D (CERN) ; Gilardoni, S (CERN) ; Petrone, C (CERN) ; Walckiers, L (CERN)
The control of five of the accelerators in the CERN injector chain (PS, PS Booster, SPS, LEIR and AD) is based upon real-time measurements in a reference magnet. These so-called “B-train” systems include a field marker to signal the achievement of a given field value, complemented by one or more pick-up coils to integrate flux changes. [...]
CERN-ATS-2010-142.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPEB016
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10.
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Beam-Based Measurement of the Waveform of the LHC Injection Kickers
/ Barnes, M J (CERN) ; Ducimetière, L (CERN) ; Goddard, B (CERN) ; Hessler, C (CERN) ; Mertens, V (CERN) ; Uythoven, J (CERN)
Proton and ion beams are injected into LHC at 450 GeV by two kicker magnet systems, producing magnetic field pulses of up to 7.8 ms flat top duration with rise and fall times of not more than 900 ns and 3 ms, respectively. Both systems are composed of four travelling wave kicker magnets, powered by pulse forming networks. [...]
CERN-ATS-2010-141.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPD088
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12.
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The Final Beam Line Design for the HiRadMat Test Facility
/ Hessler, C (CERN) ; Goddard, B (CERN) ; Meddahi, M (CERN)
The High Radiation to Materials facility - hereafter HiRadMat - is designed to allow testing of accelerator components, in particular those of the LHC and its injectors, with the impact of high-intensity pulsed beams. The facility is currently under construction, as an approved CERN project [...]
CERN-ATS-2010-138.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.THPEB029
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13.
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Results of 2009 Optics Studies of the SPS to LHC Transfer Lines
/ Meddahi, M (CERN) ; Fartoukh, S (CERN) ; Fuchsberger, K (CERN) ; Goddard, B (CERN) ; Herr, W (CERN) ; Kain, V (CERN) ; Kaltchev, D (TRIUMF) ; Mertens, V (CERN) ; Wenninger, J (CERN)
In 2008, the SPS-to-LHC transfer line operation allowed for the first time to perform beam measurements in the last part of the lines and into the LHC. Beam parameters were measured and compared with expectation. [...]
CERN-ATS-2010-137.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUPEB069
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14.
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Inductive Shimming of Superconductive Undulators - Preparations for a realistic test
/ Schoerling, D (CERN) ; Baumbach, T (Karlsruhe, Inst. Technol.) ; Bernhard, (Karlsruhe, Inst. Technol.) ; Burkart, F (Karlsruhe, Inst. Technol.) ; Ehlers, S (Karlsruhe, Inst. Technol.) ; Gerstl, S (Karlsruhe, Inst. Technol.) ; Grau, A (Karlsruhe, Inst. Technol.) ; Peiffer, P (Karlsruhe, Inst. Technol.) ; Rossmanith, R (Karlsruhe, Inst. Technol.) ; Wollmann, D (CERN)
The monochromaticity and intensity of synchrotron light emitted by undulators strongly depend on the undulator field quality. For the particular case of superconductive undulators it was shown recently that their field quality can be significantly improved by an array of coupled high temperature superconductor loops attached to the surface of the superconductive undulator. [...]
CERN-ATS-2010-136.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPD015
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15.
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Beam Commissioning and Performance Characterisation of the LHC Beam Dump Kicker Systems
/ Uythoven, J (CERN) ; Carlier, E (CERN) ; Ducimetière, L (CERN) ; Goddard, B (CERN) ; Kain, V (CERN) ; Magnin, N (CERN)
The LHC beam dump system was commissioned with beam in 2009. This paper describes the operational experience with the kicker systems and the tests and measurements to qualify them for operation. [...]
CERN-ATS-2010-135.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUPEB062
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17.
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Beam Commissioning of the Injection Protection System of the LHC
/ Bartmann, W (CERN) ; Assmann, R (CERN) ; Bracco, C (CERN) ; Dehning, B (CERN) ; Goddard, B (CERN) ; Holzer, E B (CERN) ; Kain, V (CERN) ; Meddahi, M (CERN) ; Nordt, A (CERN) ; Redaelli, S (CERN) et al.
The movable LHC injection protection devices in the SPS-to-LHC transfer lines and downstream of the injection kicker in the LHC were commissioned with low-intensity beam. The different beam-based alignment measurements used to determine the beam centre and size are described, together with the results of measurements of the transverse beam distribution at large amplitude. [...]
CERN-ATS-2010-133.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUPEB067
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18.
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Design and Development of Kickers and Septa for Medaustron
/ Borburgh, J (CERN) ; Balhan, B (CERN) ; Barnes, M J (CERN) ; Fowler, T (CERN) ; Hinterschuster, F (Vienna, Tech. U.) ; Hourican, M (CERN) ; Kramer, T ; Palm, M (CERN) ; Prost, A (CERN) ; Sermeus, L (CERN) et al.
The MedAustron facility, to be built in Wiener Neustadt (Austria), will provide protons and ions for both cancer therapy and research. Different types of bumpers, septa and kickers will be used in the low energy beam transfer line, the synchrotron and the high energy extraction lines.They are presently being designed in collaboration with CERN. [...]
CERN-ATS-2010-132.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.THPEB032
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19.
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Performance Studies for Protection Against Asynchronous Dumps in the LHC
/ Kramer, T (CERN) ; Bartmann, W (CERN) ; Bracco, C (CERN) ; Goddard, B (CERN) ; Meddahi, M (CERN)
The LHC beam dump system has to safely dispose all beams in a wide energy range of 450 GeV to 7 TeV. A 3 ms abort gap in the beam structure for the switch-on of the extraction kicker field ideally allows a loss-free extraction under normal operating conditions. [...]
CERN-ATS-2010-131.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUPEB063
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21.
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Upgrade of the Quench Protection Systems for the Superconducting Circuits of the LHC Machine at CERN: From Concept and Design to the First Operational Experience
/ Formenti, F (CERN) ; Charifoulline, Z (CERN) ; Coelingh, G J (CERN) ; Dahlerup-Petersen, K (CERN) ; Denz, R (CERN) ; Honma, A (CERN) ; Ravaioli, E (CERN) ; Schmidt, R (CERN) ; Siemko, A (CERN) ; Steckert, J (CERN) et al.
Two events, occurring in 2008 during commissioning of the LHC circuits, lead to fundamental changes to the scope of circuit protection. The discovery of aperturesymmetric quenches and the accidental rupture at 9 kA of an interconnecting busbar resulted in an emergency program for development and implementation of new protection facilities. [...]
CERN-ATS-2010-129.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPD013
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22.
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The CERN Beam Interlock System: Principle and Operational Experience
/ Puccio, B (CERN) ; Castañeda Serra, A (CERN) ; Kwiatkowski, M (CERN) ; Romera Ramirez, I (CERN) ; Todd, B (CERN)
A complex Machine Protection System has been designed to protect the LHC machine from an accidental release of the beam energy, with about 20 subsystems providing status information to the Beam Interlock System that is the backbone of machine protection. Only if the subsystems are in the correct state for beam operation, the Beam Interlock System receives a status flag and beam can be injected into LHC (Large Hadron Collider). [...]
CERN-ATS-2010-128.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPEB073
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24.
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Stripping Foil Issues for H- Injection into the CERN PSB at 160 MeV
/ Goddard, B (CERN) ; Aiba, M (CERN) ; Bracco, C (CERN) ; Carli, C (CERN) ; Meddahi, M (CERN) ; Weterings, W J M (CERN)
Beam physics considerations for the stripping foil of the 160 MeV PSB H- injection systems are described, including the arguments for the foil type, thickness, geometry and positioning. The foil performance considerations are described, including expected stripping efficiency, emittance growth, energy straggling, temperature and lifetime. [...]
CERN-ATS-2010-126.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.THPEB030
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25.
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Aperture Measurements of the LHC Injection Regions and Beam Dump Systems
/ Goddard, B (CERN) ; Bartmann, W (CERN) ; Bracco, C (CERN) ; Kain, V (CERN) ; Meddahi, M (CERN) ; Mertens, V (CERN) ; Uythoven, J (CERN)
The commissioning of the beam transfer systems for LHC included detailed aperture measurements in the injection regions and for the beam dump systems. The measurements, mainly single pass, were made using systematic scans of different oscillation phases and amplitudes, and the results compared with the expectations from the physical aperture model of the LHC. [...]
CERN-ATS-2010-125.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.TUPEB068
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26.
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LHC Abort Gap Monitoring and Cleaning
/ This work was partly supported by the US Department of Energy, through the US LHC Accelerator Research Program (LARP) and contract DE-AC02-76SF00515 (SLAC). Collaboration
Unbunched beam is a potentially serious issue in the LHC as it may quench the superconducting magnets during a beam abort. Unbunched particles, either not captured by the RF system at injection or leaking out of the RF bucket, will be removed by using the existing damper kickers to excite resonantly the particles in the abort gap. [...]
CERN-ATS-2010-124.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPEC009
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27.
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High-Current Bus Splice Resistances and Implications for the Operating Energy of the LHC
/ Koratzinos, M (CERN) ; Bertinelli, F (CERN) ; Charifoulline, Z (CERN) ; Dahlerup-Petersen, K (CERN) ; Denz, R (CERN) ; Flora, R H (Fermilab) ; Pfeffer, H (Fermilab) ; Scheuerlein, C (CERN) ; Schmidt, R (CERN) ; Siemko, A (CERN) et al.
At each interconnection between LHC main magnets a low-resistance solder joint must be made between superconducting cables in order to provide a continuous current path through the superconductor and also to the surrounding copper stabilizer in case the cable quenches [1]. About 10,000 such joints exist in the LHC. [...]
CERN-ATS-2010-175.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.MOPEB044
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28.
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High Precision Current Control for the LHC Main Power Converters
/ Thiesen, H (CERN) ; Cerqueira Bastos, M (CERN) ; Hudson, G (CERN) ; King, Q (CERN) ; Montabonnet, V (CERN) ; Nisbet, D (CERN) ; Page, S (CERN)
Since restarting at the end of 2009, the LHC has reached a new energy record in March 2010 with the two 3.5 TeV beams. To achieve the performance required for the good functioning of the accelerator, the currents in the main circuits (Main Bends and Main Quadrupoles) must be controlled with a higher precision than ever previously requested for a particle accelerator at CERN: a few parts per million (ppm) of nominal current. [...]
CERN-ATS-2010-176.-
Geneva : CERN, 2010 - 4 p.
Fulltext: PDF; External link: Published version from JACoW
In : 1st International Particle Accelerator Conference, Kyoto, Japan, 23 - 28 May 2010, pp.WEPD070
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