CERN Accelerating science

All CERN Accelerators documents

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2019-10-12
06:01
Demonstration of loss reduction using a thin bent crystal to shadow an electrostatic septum during resonant slow extraction / Velotti, Francesco (CERN) ; Addesa, Francesca (INFN, Rome) ; Afonin, Alexander (Serpukhov, IHEP) ; Bestmann, Patrick (CERN) ; Borg, Johan (Imperial Coll., London) ; Butcher, Mark (CERN) ; Calviani, Marco (CERN) ; Chesnokov, Yuri (Serpukhov, IHEP) ; Denisov, Alexander (St. Petersburg, INP) ; Di Castro, Mario (CERN) et al.
A proof-of-principle experiment demonstrating the feasibility of using a thin, bent crystal aligned upstream of an extraction septum (ES) to increase the efficiency of the third-integer resonant slow extraction process has been carried out at the CERN Super Proton Synchrotron (SPS). With the primary aim of reducing the beam loss and induced radio-activation of the SPS, the crystal was aligned to both the beam and the septum to reduce by up to 40% the beam intensity impinging the ES and increase the intensity entering the external transfer line. [...]
2019 - 5 p. - Published in : 10.18429/JACoW-IPAC2019-THXXPLM2 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THXXPLM2

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2019-10-12
06:01
Electron cloud build-up simulations in the two-beam common chamber of the HL-LHC TDIS with non-uniform surface properties / Skripka, Galina (CERN) ; Bracco, Chiara (CERN) ; Iadarola, Giovanni (CERN) ; Perillo-Marcone, Antonio (CERN)
The segmented injection protection absorber (TDIS) foreseen for the High-Luminosity Large Hadron Collider (HL-LHC) project is designed to protect the machine in case of injection kicker malfunctioning. Since the current LHC injection protection absorber has suffered from vacuum issues possibly induced by electron multipacting, numerical studies were done to estimate the electron flux expected on the internal surfaces of the TDIS. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS052 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS052

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2019-10-12
06:01
Comparison of electron cloud build-up simulations against heat load measurements for the LHC arcs with different beam configurations / Skripka, Galina (CERN) ; Dijkstal, Philipp (PSI, Villigen) ; Iadarola, Giovanni (CERN) ; Mether, Lotta (CERN) ; Rumolo, Giovanni (CERN) ; Wulff, Eric (CERN)
Electron cloud effects are among the main performance limitations for the operation of the Large Hadron Collider (LHC) with 25 ns bunch spacing. A large number of electrons impacting on the beam screens of the cold magnets induces significant heat load, reaching values close to the full cooling capacity available from the cryogenic system. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS051 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS051

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2019-10-12
06:01
Multi-species electron-ion simulations and their application to the LHC / Mether, Lotta (CERN ; Ecole Polytechnique, Lausanne) ; Iadarola, Giovanni (CERN) ; Poland, Kyle (CERN) ; Rumolo, Giovanni (CERN) ; Skripka, Galina (CERN)
During operation in 2017 and 2018, the LHC suffered from recurrent beam aborts associated with beam losses in one of its arc cells in correlation with quickly developing transverse coherent oscillations. The events are thought to have been caused by a localised high gas density resulting from the phase transition of a macroparticle that had entered the beam. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS050 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS050

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2019-10-12
06:01
Monitoring and modelling of the LHC emittance and luminosity evolution in 2018 / Papadopoulou, Stefania (CERN) ; Antoniou, Fanouria (CERN) ; Efthymiopoulos, Ilias (CERN) ; Hostettler, Michael (CERN) ; Iadarola, Giovanni (CERN) ; Karastathis, Nikolaos (CERN) ; Kostoglou, Sofia (CERN) ; Papaphilippou, Yannis (CERN) ; Trad, Georges (CERN)
Operating at 6.5 TeV, the LHC surpassed the expectations and delivered an average of 66 fb$^{−1}$ integrated luminosity to the two high luminosity experiments ATLAS and CMS by the end of 2018. In order to provide a continuous feedback to the machine coordination for further optimizing the performance, an automated tool for monitoring the main beam parameters and machine configurations, has been devised and extensively used. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS046 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS046

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2019-10-12
06:01
High-performance scheduling of multi-beam multi-bunch simulations / Furuseth, Sondre (CERN ; Ecole Polytechnique, Lausanne) ; Buffat, Xavier (CERN)
Coherent multi-bunch interactions through beam-beam forces or wakefields can cause severe impacts on the beams in circular colliders, if not well understood and countered. COMBI is a parallel multiparticle tracking code developed to study such interactions. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS045 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS045

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2019-10-12
06:01
Instability latency in the LHC / Furuseth, Sondre (CERN ; Ecole Polytechnique, Lausanne) ; Amorim, David (CERN) ; Antipov, Sergey (CERN) ; Buffat, Xavier (CERN) ; Mounet, Nicolas (CERN) ; Métral, Elias (CERN) ; Pieloni, Tatiana (Ecole Polytechnique, Lausanne) ; Salvant, Benoit (CERN) ; Tambasco, Claudia (Ecole Polytechnique, Lausanne)
The Large Hadron Collider (LHC) has experienced multiple instabilities that occur between minutes and hours after the last modification of the machine settings. The existence of instabilities with high latency has been reproduced also in simulations. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS044 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS044

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2019-10-12
06:01
SixTrack Version 5: Status and new developments / De Maria, Riccardo (CERN) ; Andersson, Joel (CERN) ; Dalena, Barbara (IRFU, Saclay) ; Field, Laurence (CERN) ; Giovannozzi, Massimo (CERN) ; Hermes, Pascal (CERN) ; Hoimyr, Nils (CERN) ; Iadarola, Giovanni (CERN) ; Kostoglou, Sofia (CERN) ; Maclean, Ewen (CERN ; U. Malta) et al.
SixTrack Version 5 is a major SixTrack release that introduces new features, with improved integration of the existing ones, and extensive code restructuring. New features include dynamic-memory management, scattering-routine integration, a new initial-condition module, and reviewed post-processing methods. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS043 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS043

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2019-10-12
06:01
Coupling and space charge studies at the CERN PSB / Asvesta, Foteini (Natl. Tech. U., Athens ; CERN) ; Antoniou, Fanouria (CERN) ; Bartosik, Hannes (CERN) ; Di Giovanni, Gian Piero (CERN) ; Papaphilippou, Yannis (CERN)
In the nominal optics of the CERN PS-Booster (PSB), the fourth order coupling resonance is excited by space charge (Montague resonance [1]) due to the same integer tune values. This resonance can be avoided by changing the tunes to different integers. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS041 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS041

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2019-10-12
06:01
Momentum slip-stacking in CERN SPS for the ion beams / Argyropoulos, Theodoros (CERN) ; Bohl, Thomas (CERN) ; Lasheen, Alexandre (CERN) ; Papotti, Giulia (CERN) ; Quartullo, Danilo (CERN) ; Shaposhnikova, Elena (CERN)
The LHC Injectors Upgrade (LIU) project at CERN aims at doubling the total intensity of the lead ion beam for the High-Luminosity (HL) LHC. Achieving this goal requires using momentum slip-stacking in the SPS, the LHC injector. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPTS039 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPTS039

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