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HiLumi
54 items
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1.
Vacuum Performance of Amorphous Carbon Coating at Cryogenic Temperature with Presence of Proton Beams / Salemme, Roberto (CERN) ; Baglin, Vincent (CERN) ; Bregliozzi, Giuseppe (CERN) ; Chiggiato, Paolo (CERN)
Amorphous carbon (a-C) coating is the baseline electron multipacting mitigation strategy proposed for the Inner Triplets (IT) in the High Luminosity upgrade of the Large Hadron Collider (HL-LHC). As of 2014, the COLD bore EXperiment (COLDEX) is qualifying the performance of a-C coating at cryogenic temperature in a LHC type cryogenic vacuum system. [...]
CERN-ACC-2016-157.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPMY007 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPMY007
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2.
Current and Future Beam Thermal Behaviour of the LHC Injection Kicker Magnet / Day, Hugo (CERN) ; Barnes, Michael (CERN) ; Ducimetière, Laurent (CERN) ; Vega Cid, Lorena (CERN) ; Weterings, Wim (CERN)
During Run 1 of the LHC the injection kicker magnets caused occasional operational delays due to beam induced heating with high bunch intensity and short bunch lengths. Significant upgrades were carried out to the injection kicker magnets during long shutdown 1, including a new design of beam screen to reduce the beam induced heating. [...]
CERN-ACC-2016-163.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPMW031 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPMW031
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3.
Studies of Impedance-related Improvements of the SPS Injection Kicker System / Barnes, Michael (CERN) ; Adraktas, Antonios (CERN) ; Beck, Mario (CERN) ; Bregliozzi, Giuseppe (CERN) ; Day, Hugo (CERN) ; Ducimetière, Laurent (CERN) ; Ferreira Somoza, Jose (CERN) ; Goddard, Brennan (CERN) ; Kramer, Thomas (CERN) ; Pasquino, Chiara (CERN) et al.
The injection kicker system for the SPS consists of sixteen magnets housed in a total of four vacuum tanks. The kicker magnets in one tank have recently limited operation of the SPS with high-intensity beam: this is due to both beam induced heating in the ferrite yoke of the kicker magnets and abnormally high pressure in the vacuum tank. [...]
CERN-ACC-2016-164.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPMW030 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPMW030
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4.
Local Optics Corrections in the HL-LHC IR / Coello de Portugal, Jaime Maria (CERN ; Barcelona, Polytechnic U.) ; Carlier, Felix (CERN) ; Garcia-Tabares, Ana (CERN) ; Langner, Andy (CERN) ; Maclean, Ewen (CERN) ; Malina, Lukas (CERN) ; Persson, Tobias (CERN) ; Skowroński, Piotr (CERN) ; Tomás, Rogelio (CERN)
For the high luminosity upgrade of the LHC optics correction in the interaction regions is expected to be challenged by the very low β^{*} and the sizable expected quadrupolar errors in the triplet. This paper addresses the performance and limitations of the segment-by-segment technique to correct quadrupolar and skew quadrupolar errors in the HL-LHC IR via computer simulations. [...]
CERN-ACC-2016-176.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPMR040 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPMR040
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5.
Non-Linear Errors in the Experimental Insertions of the LHC / Maclean, Ewen (CERN) ; Carlier, Felix (CERN) ; Giovannozzi, Massimo (CERN) ; Langner, Andy (CERN) ; Mönig, Saskia (CERN) ; Persson, Tobias (CERN) ; Skowroński, Piotr (CERN) ; Tomás, Rogelio (CERN)
Correction of nonlinear magnetic errors in low-β insertions can be of critical significance for the operation of a collider. This is expected to be of particular relevance to LHC Run II and the HL-LHC upgrade, as well as to future colliders such as the FCC. [...]
CERN-ACC-2016-178.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-THPMR038 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.THPMR038
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6.
Position Monitoring System for HL-LHC Crab Cavities / Sosin, Mateusz (CERN) ; Dijoud, Thibault (CERN) ; Mainaud Durand, Helene (CERN) ; Rude, Vivien (Unlisted, FR)
The high luminosity upgrade for the LHC at CERN (HL-LHC project) will extend the discovery potential of the LHC by a factor 10. It relies on key innovative technologies like superconducting cavities for beam rotation, named 'crab cavities'. [...]
CERN-ACC-2016-197.- 2016 - 3 p. - Published in : 10.18429/JACoW-IPAC2016-WEPOR018 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEPOR018
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7.
Cleaning Performance of the Collimation System of the High Luminosity Large Hadron Collider / Mirarchi, Daniele (CERN) ; Appleby, Robert (U. Manchester (main)) ; Bertarelli, Alessandro (CERN) ; Bruce, Roderik (CERN) ; Cerutti, Francesco (CERN) ; Garcia Morales, Hector (Royal Holloway, U. of London) ; Hermes, Pascal (CERN) ; Kwee-Hinzmann, Regina (Royal Holloway, U. of London) ; Lechner, Anton (CERN) ; Mereghetti, Alessio (CERN) et al.
Different upgrades of the LHC will be carried out in the framework of the High Luminosity project (HL-LHC), where the total stored energy in the machine will increase up to about 700 MJ. This unprecedented stored energy poses serious challenges for the collimation system, which was designed to handle safely up to about 360 MJ. [...]
CERN-ACC-2016-216.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-WEPMW030 Fulltext: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEPMW030
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8.
Frequency Tuning for a DQW Crab Cavity / Verdú-Andrés, Silvia (RIKEN BNL) ; Artoos, Kurt (CERN) ; Ben-Zvi, Ilan (SUNY, Stony Brook ; RIKEN BNL) ; Calaga, Rama (CERN) ; Capatina, Ofelia (CERN) ; Leuxe, Raphael (CERN) ; Skaritka, John (RIKEN BNL) ; Wu, Qiong (RIKEN BNL) ; Xiao, Binping (RIKEN BNL) ; Zanoni, Carlo (CERN)
The nominal operating frequency for the HL-LHC crab cavities is 400.79 MHz within a bandwidth of ±60kHz. Attaining the required cavity tune implies a good understanding of all the processes that influence the cavity frequency from the moment when the cavity parts are being fabricated until the cavity is installed and under operation. [...]
CERN-ACC-2016-225.- 2016 - 3 p. - Published in : 10.18429/JACoW-IPAC2016-WEPMR038 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEPMR038
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9.
Performance and Operational Aspects of HL-LHC Scenarios / Medina Medrano, Luis (CICATA-Legaria, IPN) ; Tomás, Rogelio (CERN)
Several alternatives to the present HL-LHC baseline configuration have been proposed, aiming either to improve the potential performance, reduce its risks, or to provide options for addressing possible limitations or changes in its parameters. In this paper we review and compare the performance of the HL-LHC baseline and the main alternatives with the latest parameters set. [...]
CERN-ACC-2016-240.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-TUPMW035 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.TUPMW035
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10.
A 200 MHz SC-RF System for the HL-LHC / Calaga, Rama (CERN) ; Tomás, Rogelio (CERN)
A quarter wave β=1 superconducting cavity at 200 MHz is proposed for the LHC as an alternative to the present 400 MHz RF system. The primary motivation of such a system would be to accelerate higher intensity and longer bunches with improved capture efficiency. [...]
CERN-ACC-2016-241.- 2016 - 3 p. - Published in : 10.18429/JACoW-IPAC2016-TUPMW034 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.TUPMW034
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11.
Machine Protection from Fast Crab Cavity Failures in the High Luminosity LHC / Santamaría García, Andrea (CERN) ; Bruce, Roderik (CERN) ; Burkhardt, Helmut (CERN) ; Cerutti, Francesco (CERN) ; Kwee-Hinzmann, Regina (CERN ; Royal Holloway, U. of London) ; Lechner, Anton (CERN) ; Sjobak, Kyrre (CERN) ; Tsinganis, Andrea (CERN)
The time constant of a crab cavity (CC) failure can be faster than the reaction time of the active protection system. In such a scenario, the beams cannot be immediately extracted, making the the protection of the machine rely on the passive protection devices. [...]
CERN-ACC-2016-248.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-TUPMW025 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.TUPMW025
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12.
Effect of the LHC Beam Screen Baffle on the Electron Cloud Buildup / Romano, Annalisa (CERN) ; Iadarola, Giovanni (CERN) ; Li, Kevin (CERN) ; Rumolo, Giovanni (CERN)
Electron Cloud (EC) has been identified as one of the major intensity-limiting factors in the CERN Large Hadron Collider (LHC). Due to the EC, an additional heat load is deposited on the perforated LHC beam screen, for which only a small cooling capacity is available. [...]
CERN-ACC-2016-256.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-TUPMW016 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.TUPMW016
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13.
Experimental Demonstration of β* Leveling at the LHC / Gorzawski, Arkadiusz (CERN) ; Mirarchi, Daniele (CERN) ; Salvachua, Belen (CERN) ; Wenninger, Jorg (CERN)
The HL-LHC project foresees to boost the LHC peak luminosity beyond the capabilities of the LHC experimental detectors. Leveling the luminosity down to a constant value that is sustainable for the experiments is therefore the operational baseline of HL-LHC. [...]
CERN-ACC-2016-259.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-TUPMW013 Fulltext: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.TUPMW013
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14.
Impact of Long Range Beam-Beam Effects on Intensity and Luminosity Lifetimes from the 2015 LHC Run / Crouch, Matthew (U. Manchester (main)) ; Appleby, Robert (U. Manchester (main)) ; Banfi, Danilo (EPFL-ISIC, Lausanne) ; Barranco, Javier (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Muratori, Bruno (Daresbury) ; Pojer, Mirko (CERN) ; Salvachua, Belen (CERN) ; Tambasco, Claudia (EPFL-ISIC, Lausanne) et al.
Luminosity is one of the key parameters that determines the performance of colliding beams in the Large Hadron Collider (LHC). Luminosity can therefore be used to quantify the impact of beam-beam interactions on the beam lifetimes and emittances. [...]
CERN-ACC-2016-263.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-TUPMW007 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.TUPMW007
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15.
LHC Luminosity Modeling for RUNII / Antoniou, Fanouria (CERN) ; Arduini, Gianluigi (CERN) ; Hostettler, Michael (CERN) ; Lamont, Mike (CERN) ; Papadopoulou, Stefania (CERN) ; Papaphilippou, Yannis (CERN) ; Papotti, Giulia (CERN) ; Pojer, Mirko (CERN) ; Salvachua, Belen (CERN) ; Wyszynski, Michal (CERN)
After a long shut-down (LS1), LHC restarted its operation on April 2015 at a record energy of 6.5TeV, achieving soon a good luminosity performance. In this paper, a luminosity model based on the three main components of the LHC luminosity degradation (intrabeam scattering, synchrotron radiation and luminosity burn-off), is compared with data from runII. [...]
CERN-ACC-2016-268.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-TUPMW002 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.TUPMW002
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16.
SPS Injection and Beam Quality for LHC Heavy Ions With 150 ns Kicker Rise Time / Goddard, Brennan (CERN) ; Carlier, Etienne (CERN) ; Ducimetière, Laurent (CERN) ; Kotzian, Gerd (CERN) ; Uythoven, Jan (CERN) ; Velotti, Francesco (EPFL-ISIC, Lausanne)
As part of the LHC Injectors Upgrade project for LHC heavy ions, the SPS injection kicker system rise time needs reduction below its present 225 ns. One technically challenging option under consideration is the addition of fast Pulse Forming Lines in parallel to the existing Pulse Forming Networks for the 12 kicker magnets MKP-S, targeting a system field rise time of 100 ns. [...]
CERN-ACC-2016-273.- 2016 - 3 p. - Published in : 10.18429/JACoW-IPAC2016-TUPMR048 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.TUPMR048
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17.
Removing Known SPS Intensity Limitations for High Luminosity LHC Goals / Shaposhnikova, Elena (CERN) ; Argyropoulos, Theodoros (CERN) ; Bohl, Thomas (CERN) ; Cruikshank, Paul (CERN) ; Goddard, Brennan (CERN) ; Kaltenbacher, Thomas (CERN) ; Lasheen, Alexandre (CERN) ; Perez Espinos, Jaime (CERN) ; Repond, Joël (CERN) ; Salvant, Benoit (CERN) et al.
In preparation of the SPS as an LHC injector its impedance was significantly reduced in 1999 - 2000. A new SPS impedance reduction campaign is planned now for the High Luminosity (HL)-LHC project, which requires bunch intensities twice as high as the nominal one. [...]
CERN-ACC-2016-289.- 2016 - 3 p. - Published in : 10.18429/JACoW-IPAC2016-MOPOY058 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.MOPOY058
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18.
Preparations for Upgrading the RF Systems of the PS Booster / Albright, Simon (CERN) ; Quartullo, Danilo (CERN) ; Shaposhnikova, Elena (CERN)
The accelerators of the LHC injector chain need to be upgraded to provide the HL-LHC beams. The PS Booster, the first synchrotron in the LHC injection chain, uses three different RF systems (first, second and up to tenth harmonic) in each of its four rings. [...]
CERN-ACC-2016-292.- 2016 - 3 p. - Published in : 10.18429/JACoW-IPAC2016-MOPOY006 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.MOPOY006
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19.
Impedance Localization Measurements using AC Dipoles in the LHC / Biancacci, Nicolo (CERN) ; Carver, Lee (CERN) ; Papotti, Giulia (CERN) ; Persson, Tobias (CERN) ; Salvant, Benoit (CERN) ; Tomás, Rogelio (CERN)
The knowledge of the LHC impedance is of primary importance to predict the machine performance and allow for the HL-LHC upgrade. The developed impedance model can be benchmarked with beam measurements in order to assess its validity and limit. [...]
CERN-ACC-2016-302.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-MOPOR011 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.MOPOR011
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20.
The HL-LHC Impedance Model and Aspects of Beam Stability / Biancacci, Nicolo (CERN) ; Li, Kevin (CERN) ; Métral, Elias (CERN) ; Salvant, Benoit (CERN)
The LHC upgrade to the HLLHC foresees new challenging operational scenarios from the beam dynamics point of view. In order to ensure good machine operation and performance, the machine impedance, among other possible sources of instabilities like beam-beam and electron cloud, needs to be carefully quantified profiting also from the current LHC operation. [...]
CERN-ACC-2016-309.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-MOPOR009 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.MOPOR009
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21.
Simulating Proton Synchrotron Radiation in the Arcs of the LHC, HL-LHC, and FCC-hh / Guillermo Cantón, Gerardo (Merida, IPN) ; Sagan, David (Cornell U.) ; Zimmermann, Frank (CERN)
At high proton-beam energies, beam-induced synchrotron radiation is an important source of heating, of beam-related vacuum pressure increase, and of primary photoelectrons, which can give rise to an electron cloud. We use the Synrad3D code developed at Cornell to simulate the photon distributions in the arcs of the LHC, HL-LHC, and FCC-hh. [...]
CERN-ACC-2016-0079.- Geneva : CERN, 2016 - Published in : 10.18429/JACoW-IPAC2016-WEOCA03 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEOCA03
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22.
MERLIN Cleaning Studies with Advanced Collimator Materials for HL-LHC / Valloni, A. (CERN ; U. Manchester (main)) ; Rafique, H. (U. Manchester (main) ; Huddersfield U.) ; Mereghetti, A. (CERN) ; Molson, J. G. (Orsay, LAL) ; Appleby, R. (U. Manchester (main)) ; Bruce, R. (CERN) ; Quaranta, E. (CERN) ; Redaelli, S. (CERN)
The challenges of the High-Luminosity upgrade of the Large Hadron Collider require improving the beam collimation system. An intense R&D; program has started at CERN to explore novel materials for new collimator jaws to improve robustness and reduce impedance. [...]
CERN-ACC-2016-0064.- Geneva : CERN, 2016 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEPMW036
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23.
Towards Optimum Material Choices for HL-LHC Collimator Upgrade / Quaranta, E. (CERN) ; Bertarelli, A. (CERN) ; Biancacci, N. (CERN) ; Bruce, R. (CERN) ; Carra, F. (Milan Polytechnic) ; Métral, E. (CERN) ; Redaelli, S. (CERN) ; Rossi, A. (CERN) ; Salvant, B. (CERN)
The first years of operation at the LHC showed that collimator material-related concerns might limit the performance. In addition, the HL-LHC upgrade will bring the accelerator beyond the nominal performance through more intense and brighter proton beams. [...]
CERN-ACC-2016-0062.- Geneva : CERN, 2016 - Published in : 10.18429/JACoW-IPAC2016-WEPMW031 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.WEPMW031
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24.
The “Multimat” experiment at CERN HiRadMat facility: advanced testing of novel materials and instrumentation for HL-LHC collimators / Carra, F (CERN ; Turin Polytechnic) ; Bertarelli, A (CERN) ; Berthomé, E (CERN) ; Fichera, C (CERN) ; Furness, T (Huddersfield U.) ; Guinchard, M (CERN) ; Mettler, L K (CERN) ; Portelli, M (CERN ; Malta U.) ; Redaelli, S (CERN) ; Sacristan de Frutos, O (CERN)
The increase of the stored beam energy in future particle accelerators, such as the HL-LHC and the FCC, calls for a radical upgrade in the design, materials and instrumentation of Beam Intercepting Devices (BID), such as collimators Following successful tests in 2015 that validated new composite materials and a novel jaw design conceived for the HL-LHC collimators, a new HiRadMat experiment, named “HRMT36-MultiMat”, is scheduled for autumn 2017. Its objective is to determine the behaviour under high intensity proton beams of a broad range of materials relevant for collimators and beam intercepting devices, thin-film coatings and advanced equipment. [...]
ARIES-2007-002; CERN-ACC-2017-333.- 2017 - 7 p. - Published in : J. Phys.: Conf. Ser.
- Published in : (2017) , pp. MOPAB005 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPAB005
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25.
Assessment of thermal loads in the CERN SPS crab cavities cryomodule$^1$ / Carra, F (CERN) ; Apeland, J (CERN) ; Calaga, R (CERN) ; Capatina, O (CERN) ; Capelli, T (CERN) ; Verdú-Andrés, S (RIKEN BNL) ; Zanoni, C (CERN)
As a part of the HL-LHC upgrade, a cryomodule is designed to host two crab cavities for a first test with protons in the SPS machine. The evaluation of the cryomodule heat loads is essential to dimension the cryogenic infrastructure of the system. [...]
CERN-ACC-2017-331.- 2017 - 7 p. - Published in : J. Phys.: Conf. Ser. 874 (2017) 012005
- Published in : (2017) , pp. TUPVA008 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA008
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26.
Multiparametric response of the HL-LHC Dynamic Aperture in presence of beam-beam effects / Pellegrini, D (CERN) ; Fartoukh, S (CERN) ; Karastathis, N (CERN) ; Papaphilippou, Y (CERN)
We performed extended simulations of HL-LHC dynamic aperture in the presence of beam-beam effects in the weak-strong approximation, evaluating the contributions of parameters such as: bunch intensity, crossing angle, chromaticity, current in the Landau octupoles and multipole errors. From the beam dynamics point of view, the main difference between the LHC (until 2017) and the HL-LHC is the deployment of the achromatic telescopic squeezing (ATS) optics, allowing not only for a smaller β* reach, but also modifying the phase advances between the lattice correctors (sextupoles, octupoles) and the main IPs, and increasing the peak β functions in the arcs. [...]
CERN-ACC-2017-323.- 2017 - 5 p. - Published in : J. Phys.: Conf. Ser.
- Published in : (2017) , pp. TUPVA125 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA125
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27.
The crab cavities cryomodule for SPS test / Zanoni, C (CERN) ; Amorim Carvalho, A (CERN) ; Artoos, K (CERN) ; Atieh, S (CERN) ; Brodzinski, K (CERN) ; Calaga, R (CERN) ; Capatina, O (CERN) ; Capelli, T (CERN) ; Carra, F (CERN) ; Dassa, L (CERN) et al.
RF Crab Cavities are an essential part of the HL-LHC upgrade. Two concepts of such systems are being developed: the Double Quarter Wave (DQW) and the RF Dipole (RFD). [...]
CERN-ACC-2017-313.- 2017 - 7 p. - Published in : J. Phys.: Conf. Ser. 874 (2017) 012092
- Published in : (2017) , pp. MOPVA096 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPVA096
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28.
Preliminary Mechanical Design Study of the Hollow Electron Lens for HL-LHC / Zanoni, Carlo (CERN) ; Gobbi, Giorgia (CERN) ; Perini, Diego (CERN) ; Stancari, Giulio (Fermilab)
A Hollow Electron Lens (HEL) has been proposed in order to improve performance of halo control and collimation in the Large Hadron Collider in view of its High Luminosity upgrade (HL-LHC). The concept is based on a hollow beam of electrons that travels around the protons for a few meters. [...]
FERMILAB-CONF-17-275-AD-APC; CERN-ACC-2017-309.- 2017 - 7 p. - Published in : J. Phys.: Conf. Ser.
- Published in : (2017) , pp. WEPVA117 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPVA117
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29.
Study of beam-beam long range compensation with octupoles / Barranco Garcia, Javier ; Pieloni, Tatiana (Ecole Polytechnique Federale de Lausanne (CH)) ; Buffat, Xavier (CERN) ; Tambasco, Claudia
Long range beam-beam effects are responsible for particle losses and define fundamental operational parameters of colliders (i.e. crossing angles, intensities, emittances, ${\beta}$${^∗}$). [...]
CERN-ACC-2017-0065.- Geneva : CERN, 2017 - 5. - Published in : 10.18429/JACoW-IPAC2017-TUPVA027 FCC Note: PDF; Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA027
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30.
Implementation of Hollow Electron Lenses in SixTrack and First Simulation Results for the HL-LHC / Fitterer, M (Fermilab) ; Stancari, G (Fermilab) ; Valishev, a (Fermilab) ; De Maria, R (CERN) ; Redaelli, S (CERN) ; Sjobak, K (CERN) ; Wagner, J F (CERN ; Goethe U., Frankfurt (main))
Electron lenses have found a wide range of applications for hadron colliders, where the main applications are machine protection and beam-beam compensation. This paper summarizes the status of the current electron lens implementation in SixTrack with the focus on hollow electron beams for beam collimation and shows some first simulation results of the High-Luminosity upgrade of the LHC (HL-LHC)..
FERMILAB-CONF-17-197-AD; CERN-ACC-2017-307.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-THPAB041 Fulltext: thpab041 - PDF; fermilab-conf-17-197-ad - PDF; External link: FERMILABCONF
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.THPAB041
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31.
Hollow Electron Beam Collimation for HL-LHC - Effects on the Beam Core / Fitterer, M (Fermilab) ; Stancari, G (Fermilab) ; Valishev, A (Fermilab) ; Bruce, R (CERN) ; Papotti, G (CERN) ; Redaelli, S (CERN) ; Valentino, G (CERN ; Malta U.) ; Valentino, G (CERN) ; Valuch, D (CERN) ; Xu, C (CERN)
Collimation with hollow electron beams is currently one of the most promising concepts for active halo control in the High Luminosity Large Hadron Collider (HL-LHC). To ensure the successful operation of the hollow beam collimator the unwanted effects on the beam core, which might arise from the operation with a pulsed electron beam, must be minimized. [...]
FERMILAB-CONF-17-153-AD; CERN-ACC-2017-306.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-WEOBA2 Fulltext: weoba2 - PDF; fermilab-conf-17-153-ad - PDF; External link: FERMILABCONF
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEOBA2
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32.
Design and Prototyping of New CERN Collimators in the Framework of the LHC Injector Upgrade (LIU) Project and the High-Luminosity (HL-LHC) Project / Nuiry, Francois-Xavier (CERN) ; Aberle, Oliver (CERN) ; Bergeret, Maxime (CERN) ; Bertarelli, Alessandro (CERN) ; Biancacci, Nicolo (CERN) ; Bruce, Roderik (CERN) ; Calviani, Marco (CERN) ; Carra, Federico (CERN) ; Dallocchio, Alessandro (CERN) ; Gentini, Luca (CERN) et al.
In the framework of the Large Hadron Collider (LHC) Injectors Upgrade (LIU) and the High-Luminosity LHC (HL-LHC) Projects at CERN (European Organization for Nuclear Research, in Geneva, Switzerland), collimators in the Super Proton Synchrotron (SPS) to LHC transfer lines as well as ring collimators in the LHC will undergo important upgrades in the forthcoming years, mainly focused during the Long Shutdown 2 foreseen during 2019-2020. This contribution will detail the current design of the TCDIL collimators with a particular emphasis on the engineering developments performed on the collimator jaws, aiming at getting a stringent flatness while consid-ering also the integration of thermal shock resistant materials. [...]
CERN-ACC-2017-302.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-MOPAB006 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPAB006
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33.
Impact on the HL-LHC Triplet Region and Experiments From Asynchronous Beam Dumps on Tertiary Collimators / Tsinganis, Andrea (CERN) ; Bruce, Roderik (CERN) ; Cerutti, Francesco (CERN) ; Lechner, Anton (CERN)
Accidental beam impacts on the tertiary collimators (TCTs) can lead to significant energy deposition in the triplet region and to leakage of the induced particle shower towards the experimental cavern. In this work, carried out in the context of the planned High Luminosity Upgrade of the LHC, severe impacts from asynchronous beam dumps on the horizontal tertiary collimators in cells 4 and 6 of the CMS insertion were studied, with half or a full proton bunch impacting on a collimator jaw. [...]
CERN-ACC-2017-301.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-MOPAB011 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPAB011
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34.
Study of the 2015 Top Energy LHC Collimation Quench Tests Through an Advanced Simulation Chain / Skordis, Eleftherios (U. Liverpool (main) ; CERN) ; Bruce, Roderik (CERN) ; Cerutti, Francesco (CERN) ; Ferrari, Alfredo (CERN) ; Hermes, Pascal (CERN) ; Lechner, Anton (CERN) ; Mereghetti, Alessio (CERN) ; Redaelli, Stefano (CERN) ; Salvachua, Belen (CERN) ; Vlachoudis, Vasilis (CERN) et al.
While the LHC has shown record-breaking perfor-mance during the 2016 run, our understanding of the behaviour of the machine must also reach new levels. The collimation system and especially the betatron cleaning insertion region (IR7), where most of the beam halo is intercepted to protect superconducting (SC) magnets from quenching, has so far met the expectations but could nonetheless pose a bottleneck for future operation at higher beam intensities for HL-LHC. [...]
CERN-ACC-2017-300.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-MOPAB012 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPAB012
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35.
Upgrading the SPS Fast Extraction Kicker Systems for HL-LHC / Barnes, Michael (CERN) ; Beck, Mario (CERN) ; Day, Hugo (CERN) ; Ducimetière, Laurent (CERN) ; Garcia-Tabares Valdivieso, Elisa (CERN) ; Goddard, Brennan (CERN) ; Neupert, Holger (CERN) ; Romano, Annalisa (CERN) ; Vega Cid, Lorena (CERN) ; Weterings, Wim (CERN) et al.
The CERN SPS has two fast extraction systems, each consisting of travelling wave kicker magnets (MKEs). The beam induced heating in the ferrite yoke of these magnets was historically kept to an acceptable level by implementing water cooling of the kicker magnets: in addition serigraphy was applied on the surfaces of the ferrite yoke facing the beam. [...]
CERN-ACC-2017-217.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-WEPVA097 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPVA097
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36.
HL-LHC Inner Triplet Powering and Control Strategy / Yammine, Samer (CERN) ; Thiesen, Hugues (CERN)
In order to achieve the target 3000 fb-1 integrated field for the HL-LHC (High Luminosity ' Large Hadron Collider) at ATLAS and CMS, new large aperture quadrupoles are required for the final focusing triplet magnets before the interaction points. These low-' magnets, based on the Nb$_{3}$Sn technology, deliver a peak field of 11.4 T. [...]
CERN-ACC-2017-215.- 2017 - 3 p. - Published in : 10.18429/JACoW-IPAC2017-WEPVA116 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPVA116
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37.
Calculation of Wakefields and Higher Order Modes for the Vacuum Chamber of the CMS, ATLAS, ALICE and LHCb Experiments for the HL-LHC / Wanzenberg, Rainer (DESY) ; Metral, Elias (CERN) ; Salvant, Benoit (CERN) ; Zagorodnova, Olga (DESY)
The High Luminosity Large Hadron Collider (HL-LHC) project was started with the goal to extend the discovery potential of the Large Hadron Collider (LHC). The HL-LHC study implies also upgraded dimensions of the experimental beam pipes of the CMS, ATLAS, ALICE and LHCb experiments. [...]
CERN-ACC-2017-212.- 2017 - 3 p. - Published in : 10.18429/JACoW-IPAC2017-WEPIK066 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPIK066
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38.
Comparing Behaviour of Simulated Proton Synchrotron Radiation in the Arcs of the LHC with Measurements / Guillermo Cantón, Gerardo (CERN) ; Ady, Marton (CERN) ; Angelucci, Marco (Frascati) ; Cimino, Roberto (Frascati) ; Kersevan, Roberto (CERN) ; La Francesca, Eliana (Frascati) ; Sagan, David (Cornell U., CLASSE) ; Zimmermann, Frank (CERN)
In previous work it was shown that at high proton-beam energies, synchrotron radiation is an important source of beam-screen heating, of beam-related vacuum pressure increase, and of primary photoelectrons, which can contribute to electron cloud formation. We have used the Synrad3D code developed at Cornell to simulate the photon distributions in the arcs of the LHC, HL-LHC, and FCC-hh. [...]
CERN-ACC-2017-209.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-TUPVA011 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA011
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39.
Impact of Collision Debris in the HL-LHC ATLAS and CMS Insertions / Tsinganis, Andrea (CERN) ; Cerutti, Francesco (CERN)
The High Luminosity upgrade of the LHC (HL-LHC) foresees the baseline operation of the accelerator at a 5 times higher peak luminosity (5.0x1034cm⁻²s^{−1}). The impact of collision debris on the magnets and other equipment in the triplet region and matching section of the ATLAS and CMS insertions has been evaluated by means of detailed FLUKA models implementing the latest optics and layout version. [...]
CERN-ACC-2017-205.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-TUPVA021 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA021
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40.
Optimising Machine-Experiment Interventions in HL-LHC / Sanchez Galan, Francisco (CERN) ; Adorisio, Cristina (CERN) ; Bergstrom, Ida (CERN) ; Brethoux, Damien (CERN) ; Evrard, Sebastien (CERN) ; Gaddi, Andrea (CERN) ; Krzkempek, Lukasz (CERN) ; Lazzaroni, Michael (CERN) ; Perez Espinos, Jaime (CERN) ; Raymond, Michel (CERN) et al.
The luminosity reach of the HL-LHC experiments implies new constraints for the protection of the inner triplets from the machine debris. In general activation levels will increase a factor of 15-30 from the 2015 values (LS1), affecting both radiation tolerance of equipment and maintenance scenarios. [...]
CERN-ACC-2017-193.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-WEPVA114 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPVA114
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41.
Modeling the Low Level RF Response on the Beam during Crab Cavity Quench / Apsimon, Robert (Lancaster U.) ; Appleby, Robert (U. Manchester (main)) ; Baudrenghien, Philippe (CERN) ; Burt, Graeme (Lancaster U.) ; Dexter, Amos (Lancaster U.) ; Sjobak, Kyrre (CERN)
The High Luminosity Upgrade for the LHC (HL-LHC) relies on crab cavities to compensate for the luminosity reduction due to the crossing angle of the colliding bunches at the interaction points. In this paper we present the simulation studies of cavity quenches and the impact on the beam. [...]
CERN-ACC-2017-186.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-MOPVA102 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPVA102
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42.
Study of an Improved Beam Screen Design for the LHC Injection Kicker Magnet for HL-LHC / Vlachodimitropoulos, Vasileios (CERN) ; Barnes, Michael (CERN) ; Ducimetière, Laurent (CERN) ; Vega Cid, Lorena (CERN) ; Weterings, Wim (CERN)
During Run 1 of the LHC, one of the injection kicker magnets (MKIs) occasionally exhibited an excessively high ferrite temperature, caused by coupling of the high intensity beam to the real impedance of the magnet. Beam-screen upgrades have been very effective in reducing beam coupling impedance during Run 2 [...]
CERN-ACC-2017-177.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-WEPVA094 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPVA094
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43.
Thermo-Physical and Mechanical Characterisation of Novel Materials under Development for HL-LHC Beam Intercepting Devices / Sacristan De Frutos, Oscar (CERN) ; Bertarelli, Alessandro (CERN) ; Bianchi, Laura (CERN) ; Carra, Federico (CERN) ; Guardia, Jorge (CERN) ; Guinchard, Michael (CERN) ; Redaelli, Stefano (CERN)
The collimation system for high energy particle accelerators as HL-LHC, must be designed to withstand the close interaction with intense and energetic particle beams, safely operating over an extended range of temperatures in extreme conditions (pressure, strain-rate, radiation), which are to become more demanding with the High Luminosity LHC. In order to withstand such conditions, the candidate materials must possess among other properties outstanding thermal shock resistance and high thermal and electrical conductivity, condition only met by advanced or novel materials. [...]
CERN-ACC-2017-170.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-WEPVA113 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPVA113
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44.
New Methods for Measurement of Nonlinear Errors in LHC Experimental IRs and Their Application in the HL-LHC / Maclean, Ewen (CERN) ; Carlier, Felix (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Garcia-Tabares, Ana (CERN) ; Giovannozzi, Massimo (CERN) ; Malina, Lukas (CERN) ; Persson, Tobias (CERN) ; Skowroński, Piotr (CERN) ; Tomás, Rogelio (CERN)
Studies of nonlinear errors in LHC experimental insertions (IRs) during Run 1 were based upon feed-down to tune and coupling from the crossing angle orbit bumps. Useful for validating the magnetic model, this method alone is of limited use to understand discrepancies between magnetic and beam-based measurement. [...]
CERN-ACC-2017-166.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-WEPIK093 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPIK093
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45.
LHC Beam Dump Performance in View of the High Luminosity Upgrade / Wiesner, Christoph (CERN) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Carlier, Etienne (CERN) ; Ducimetière, Laurent (CERN) ; Frankl, Matthias (CERN) ; Fraser, Matthew (CERN) ; Goddard, Brennan (CERN) ; Kramer, Thomas (CERN) ; Lechner, Anton (CERN) et al.
The High Luminosity Large Hadron Collider (HL-LHC) project will increase the total beam intensity in the LHC by nearly a factor of two. Analysis and follow-up of recent operational issues as well as dedicated studies of the LHC Beam Dump System (LBDS) have been carried out to ensure the safe operation with HL-LHC parameters and to decide on possible hardware upgrades to meet the HL-LHC requirements. [...]
CERN-ACC-2017-159.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-WEPIK033 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.WEPIK033
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46.
Progress with Long-Range Beam-Beam Compensation Studies for High Luminosity LHC / Rossi, Adriana (CERN) ; Aberle, Oliver (CERN) ; Albertone, Joel (CERN) ; Barnyakov, Alexey (Novosibirsk, IYF) ; Bertarelli, Alessandro (CERN) ; Boccard, Christian (CERN) ; Carra, Federico (CERN) ; Cattenoz, Gregory (CERN) ; Delaup, Yorick (CERN) ; Fartoukh, Stephane (CERN) et al.
Long-range beam-beam (LRBB) interactions can be a source of emittance growth and beam losses in the LHC during physics and will become even more relevant with the smaller '* and higher bunch intensities foreseen for the High Luminosity LHC upgrade (HL-LHC), in particular if operated without crab cavities. Both beam losses and emittance growth could be mitigated by compensat-ing the non-linear LRBB kick with a correctly placed current carrying wire. [...]
CERN-ACC-2017-158.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-TUPVA115 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA115
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47.
Requirements for Crab Cavity System Availability in HL-LHC / Valette, Matthieu (CERN) ; Apollonio, Andrea (CERN) ; Uythoven, Jan (CERN) ; Wollmann, Daniel (CERN)
Crab Cavities will be installed in the High Luminosity LHC in order to increase the effective peak luminosity through a partial compensation of the geometric factor. This will allow extending the levelling time resulting in an increased production of integrated luminosity. [...]
CERN-ACC-2017-153.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-TUPVA022 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA022
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48.
Observations of Emittance Growth in the Presence of External Noise in the LHC / Buffat, Xavier (CERN) ; Barranco García, Javier (Ecole Polytechnique, Lausanne) ; Pieloni, Tatiana (Ecole Polytechnique, Lausanne) ; Tambasco, Claudia (Ecole Polytechnique, Lausanne ; CERN) ; Valuch, Daniel (CERN)
Dedicated experiments were perfomed in the LHC to study the impact of noise on colliding high brightness beams. The results are compared to theoretical models and multiparticle tracking simulations. [...]
CERN-ACC-2017-152.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-TUPVA029 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA029
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49.
Measurement of Beta-Beating Due to Strong Head-on Beam-Beam Interactions in the LHC / Gonçalves Jorge, Patrik (Ecole Polytechnique, Lausanne) ; Barranco García, Javier (Ecole Polytechnique, Lausanne) ; Buffat, Xavier (CERN) ; Carlier, Felix (CERN) ; Coello de Portugal, Jaime Maria (CERN) ; Fol, Elena (CERN) ; Medina Medrano, Luis (CERN) ; Pieloni, Tatiana (Ecole Polytechnique, Lausanne) ; Tomás, Rogelio (CERN) ; Wegscheider, Andreas (CERN)
The LHC operation relies on a good knowledge of the optics, usually corrected in absence of beam-beam interactions. In a near future, both the LHC and the HL-LHC will need to cope with large head-on beam-beam parameters, the impact on the optics needs to be understood and, if necessary, corrected. [...]
CERN-ACC-2017-151.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-TUPVA030 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA030
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50.
Lessons Learnt from the 2016 LHC Run and Prospects for HL-LHC Availability / Apollonio, Andrea (CERN) ; Rey Orozko, Odei (CERN) ; Schmidt, Ruediger (CERN) ; Valette, Matthieu (CERN) ; Wollmann, Daniel (CERN) ; Zerlauth, Markus (CERN)
The LHC exhibited unprecedented availability during the 2016 proton run, producing about 40 fb-1 of integrated luminosity, surpassing the sum of production during the 4 previous years. This was achieved while running steadily with a peak luminosity above the design target of 1034 cm- 2s^{−1}. [...]
CERN-ACC-2017-145.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-TUPVA006 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA006
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51.
Radiation Levels at the LHC: 2012, 2015 and 2016 Proton Physics Operations in View of HL-LHC requirements / Martinella, Corinna (CERN) ; Brugger, Markus (CERN) ; Danzeca, Salvatore (CERN) ; Garcia Alia, Ruben (CERN) ; Kadi, Yacine (CERN) ; Stein, Oliver (CERN) ; Xu, Chen (CERN)
The variety of beam losses produced in the Large Hadron Collider (LHC) creates a mixed and complex radiation field. During 2012, 2015 and 2016, Beam Loss Monitors and RadMons were used to monitor the inte-grated dose and the High Energy Hadrons fluence in order to anticipate the electronics degradation and inves-tigate the cause of failures. [...]
CERN-ACC-2017-142.- 2017 - 3 p. - Published in : 10.18429/JACoW-IPAC2017-TUPVA015 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPVA015
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52.
HL-LHC Alignment Requirements and Associated Solutions / Mainaud Durand, Helene (CERN) ; Bartolome-Jimenez, Sonia (CERN) ; Dijoud, Thibault (CERN) ; Duquenne, Mathieu (ESGT, Le Mans) ; Herty, Andreas (CERN) ; Rude, Vivien (ESGT, Le Mans) ; Sosin, Mateusz (CERN)
To increase by more than 10 times the luminosity reach w.r.t the first 10 years of the LHC lifetime, the HL-LHC project will replace nearly 1.2 km of the accelerator during the Long Shutdown 3 scheduled in 2024 [1][2][3]. This paper presents the HL-LHC alignment and internal metrology requirements of all the new components to be installed, from the magnet components to the beam instrumentation and vacuum devices. [...]
CERN-ACC-2017-138.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-TUPIK085 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPIK085
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53.
Studies on Luminous Region, Pile-up and Performance for HL-LHC Scenarios / Medina Medrano, Luis (CERN ; Unlisted, MX) ; Arduini, Gianluigi (CERN) ; Tomás, Rogelio (CERN)
Studies on luminous region and pile-up density are of great interest for the experiments at the future High Luminosity LHC (HL-LHC) in order to optimize the detector performance. The evolution of these parameters at the two main interaction points of the HL-LHC along optimum physics fills is studied for the baseline and alternative operational scenarios with the latest set of parameters, including a refined description of the longitudinal bunch profile. [...]
CERN-ACC-2017-135.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-TUPIK089 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.TUPIK089
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54.
Improved Protection of the Warm Magnets of the LHC Betatron Cleaning Insertion / Bahamonde Castro, Cristina (CERN) ; Cerutti, Francesco (CERN) ; Fessia, Paolo (CERN) ; Lechner, Anton (CERN) ; Mereghetti, Alessio (CERN) ; Mirarchi, Daniele (CERN) ; Redaelli, Stefano (CERN) ; Skordis, Eleftherios (U. Liverpool (main) ; CERN)
After the High Luminosity (HL) upgrade in 2024-2026, the LHC is anticipated to increase its integrated luminosity by a factor of 10 beyond its original design value of 300 fb-1. In preparation for this, several improvements to the equipment will already be implemented during the next Long Shutdown (LS2) starting in 2019. [...]
CERN-ACC-2017-120.- 2017 - 4 p. - Published in : 10.18429/JACoW-IPAC2017-MOPAB004 Fulltext: PDF;
In : 8th International Particle Accelerator Conference, Copenhagen, Denmark, 14 - 19 May 2017, pp.MOPAB004
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