CERN Accelerating science

All CERN Accelerators documents

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2019-10-22
17:27
Possible Mitigations of Longitudinal Intensity Limitations for HL-LHC Beam in the CERN SPS / Repond, Joel
The Super Proton Synchrotron (SPS) at CERN is the injector of the Large Hadron Collider (LHC), the world's largest particle collider. The High-Luminosity LHC (HL-LHC) project is a major step forward in the improvement of the LHC performances and it requires a doubling of the nominal bunch intensity of the current LHC beam. [...]
CERN-THESIS-2019-173.- Lausanne : École polytechnique fédérale de Lausanne, 2019-10-11 - 198 p. Fulltext: PDF; External link: Approve this document (restricted)

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2019-10-22
10:48
MD 3292: Measurements of Landau Damping by Means of BTF Measurements / Tambasco, Claudia (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Buffat, Xavier (CERN) ; Bruce, Roderik (CERN) ; Gasior, Marek (CERN) ; Levens, Tom (CERN) ; Mereghetti, Alessio (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH)) et al.
The methodology applied in previous MDs has shown the possibility of using BTFs measurements to estimate the transverse Landau Damping of the beams for different machine configurations. [...]
CERN-ACC-NOTE-2019-0045.
- 2019. - 10 p.
Full text

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2019-10-22
10:41
MD 3290: Instability threshold measurements in the presence of a controlled external excitation / Tambasco, Claudia (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Barranco, Javier (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Buffat, Xavier (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) ; Levens, Tom (CERN) ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH))
During the MD 2722 an unexpected instability was observed at flat top energy during BTF measurements. [...]
CERN-ACC-NOTE-2019-0044.
- 2019. - 6 p.
Full text

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2019-10-22
06:18
Ultra-high vacuum characterization of molybdenum-carbide graphite for HL-LHC collimators / Accettura, Carlotta (CERN ; Milan, Polytech.) ; Beghi, Marco (Milan, Polytech.) ; Bertarelli, Alessandro (CERN) ; Bregliozzi, Giuseppe (CERN) ; Cattenoz, Gregory (CERN) ; Guardia Valenzuela, Jorge (U. Zaragoza (main) ; CERN) ; Redaelli, Stefano (CERN) ; Taborelli, Mauro (CERN) ; Carra, Federico (CERN)
In view of the High-Luminosity upgrade of the Large Hadron Collider (LHC) collimation system, a family of novel molybdenum-carbide graphite (MoGr) composites was developed to meet the challenging requirements of HL-LHC beam-halo collimation, in particular the electrical conductivity and thermo-mechanical performances. The Ultra-High Vacuum (UHV) behaviour of this material was extensively characterized to assess its compatibility with the accelerator’s specifications. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS093 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS093

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2019-10-22
06:18
Numerical and experimental evaluation of the DQW crab cavity cryomodule thermal budget / Cano-Pleite, Eduardo (CERN) ; Brodzinski, Krzysztof (CERN) ; Capatina, Ofelia (CERN) ; Carra, Federico (CERN)
One of the key devices of the HL-LHC project are SRF Crab Cavities. A cryomodule with two Double Quarter Wave (DQW) crab cavities has been fabricated at CERN in 2017 and successfully tested with beam in the Super Proton Synchrotron (SPS) in 2018. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS092 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS092

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2019-10-22
06:18
Mechanical robustness of HL-LHC collimator designs / Carra, Federico (CERN) ; Bertarelli, Alessandro (CERN) ; Gobbi, Giorgia (CERN) ; Guardia-Valenzuela, Jorge (CERN ; U. Zaragoza (main)) ; Guinchard, Michael (CERN) ; Harden, Fiona (CERN) ; Pasquali, Michele (CERN) ; Redaelli, Stefano (CERN) ; Skordis, Eleftherios (CERN)
Two new absorbing materials were developed as collimator inserts to fulfil the requirements of HL-LHC higher brightness beams: molybdenum-carbide graphite (MoGr) and copper-diamond (CuCD). These materials were tested under intense beam impacts at CERN HiRadMat facility in 2015, when full jaw prototypes were irradiated. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS091 Preprint: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS091

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2019-10-22
06:18
Beam-based measurement of the skew-sextupolar component of the radio frequency field of a HL-LHC-type crab-cavity / Carlà, Michele (CERN) ; Alekou, Androula (CERN ; U. Manchester (main)) ; Bartosik, Hannes (CERN) ; Carver, Lee (CERN ; U. Liverpool (main))
Two High Luminosity Large Hadron Collider (LHC) type crab-cavities have been installed in the CERN SPS for testing purposes. An attempt to characterize the skew-sextupolar component of the radio frequency field of the crab-cavity ($a_3$) has been carried out by means of beam-based techniques using turn-by-turn monitoring of the betatron motion. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS090 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS090

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2019-10-22
06:18
Transverse beam dynamics studies with high intensity LHC beams in the SPS / Carlà, Michele (CERN) ; Bartosik, Hannes (CERN) ; Beck, Mario (CERN) ; Carver, Lee (CERN ; U. Liverpool (main)) ; Kain, Verena (CERN) ; Kotzian, Gerd (CERN) ; Li, Kevin (CERN) ; Rumolo, Giovanni (CERN) ; Zannini, Carlo (CERN)
In order to reach the target beam parameters of the LHC injectors upgrade (LIU), about twice the presently operational intensity of LHC type beams has to be achieved. Although the planned upgrade of the main RF system will occur during the long shutdown, a series of measurements have been performed to assess the beam dynamics challenges with these very high intensity beams on the long SPS injection plateau. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS089 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS089

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2019-10-22
06:18
Status of the CLEAR electron beam user facility at CERN / Sjobak, Kyrre (Oslo U. ; CERN) ; Adli, Erik (Oslo U.) ; Bergamaschi, Michele (CERN) ; Burger, Stephane (CERN) ; Corsini, Roberto (CERN) ; Curcio, Alessandro (CERN) ; Curt, Stephane (CERN) ; Döbert, Steffen (CERN) ; Farabolini, Wilfrid (CERN) ; Gamba, Davide (CERN) et al.
The CERN Linear Electron Accelerator for Research (CLEAR) has now finished its second year of operation, providing a testbed for new accelerator technologies and a versatile radiation source. Hosting a varied experimental program, this beamline provides a flexible test facility for users both internal and external to CERN, as well as being an excellent accelerator physics training ground. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS054 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS054

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2019-10-22
06:18
Transverse emittance studies at extraction of the CERN PS Booster / Antoniou, Fanouria (CERN) ; Albright, Simon (CERN) ; Asvesta, Foteini (CERN) ; Bartosik, Hannes (CERN) ; Di Giovanni, Gian Piero (CERN) ; Forte, Vincenzo (CERN) ; Fraser, Matthew (CERN) ; Valdivieso, Ana (CERN) ; Huschauer, Alexander (CERN) ; Mikulec, Bettina (CERN) et al.
Transverse emittance discrepancy in the beam transfer between the Proton Synchrotron Booster (PSB) and the Proton Synchrotron (PS) is observed in operational conditions for the LHC beams at CERN. The ongoing LHC Injectors Upgrade (LIU) project requires a tight budget for beam degradation along the injector chain and therefore the reason for this emittance discrepancy needs to be understood. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-MOPTS087 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.MOPTS087

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