CERN Accelerating science

LHC

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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
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
Cryogenic RF performance of double-quarter wave cavities equipped with HOM filters / Verdú-Andrés, Silvia (Brookhaven Natl. Lab.) ; Ben-Zvi, Ilan (Stony Brook U. ; Brookhaven Natl. Lab.) ; Burt, Graeme (Lancaster U. ; Daresbury) ; Calaga, Rama (CERN) ; Capatina, Ofelia (CERN) ; Huque, Naeem (Jefferson Lab) ; Li, Zenghai (SLAC) ; McEwen, Anne (Jefferson Lab) ; Mitchell, James (Lancaster U.) ; Park, HyeKyoung (Jefferson Lab) et al.
Crab cavities are one of the several components included in the luminosity upgrade of the Large Hadron Collider (HL-LHC). The cavities have to provide a nominal deflecting kick of 3.4 MV per cavity while the cryogenic load per cavity stays below 5 W. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPRB098 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPRB098

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2019-10-11
11:15
ATLAS Experiment Colouring Book in Chinese | 超环面仪器(ATLAS) 彩铅手绘本 / Anthony, Katarina (Universita degli Studi di Udine (IT))
Language: Chinese - The ATLAS Experiment Colouring Book is a free-to-download educational book, ideal for kids aged 5-9. [...]
ATLAS-OUTREACH-2019-004.
- 2019. - 16.
Language: Chinese

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2019-10-11
06:14
LHC Injectors Upgrade project: Towards new territory beam parameters / Meddahi, Malika (CERN) ; Alemany-Fernández, Reyes (CERN) ; Bartosik, Hannes (CERN) ; Bellodi, Giulia (CERN) ; Coupard, Julie (CERN) ; Damerau, Heiko (CERN) ; Di Giovanni, Gian Piero (CERN) ; Dos Santos Pedrosa, Fernando (CERN) ; Funken, Anne (CERN) ; Goddard, Brennan (CERN) et al.
The LHC Injectors Upgrade (LIU) project aims at increasing the intensity and brightness in the LHC injectors in order to match the challenging requirements of the High-Luminosity LHC (HL-LHC) project, while ensuring high availability and reliable operation of the injectors complex up to the end of the HL-LHC era (ca. 2035). [...]
2019 - 6 p. - Published in : 10.18429/JACoW-IPAC2019-THXPLM1 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THXPLM1

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2019-10-09
09:01
Report and Analysis from LHC MD 3311: Amplitude detuning at end-of-squeeze / Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Albert, Markus (CERN) ; Argyropoulos, Theodoros (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Hofer, Michael (Vienna University of Technology (AT)) ; Malina, Lukas (CERN) ; Maclean, Ewen Hamish (University of Malta (MT)) ; Solfaroli Camillocci, Elena (Sapienza Universita e INFN, Roma I (IT)) ; Tomas Garcia, Rogelio (CERN)
Amplitude detuning at end-of-squeeze is measured during this MD, with both flat-orbit and crossing-angles in IP5. [...]
CERN-ACC-NOTE-2019-0042.
- 2019. - 39 p.
Full text

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2019-10-09
06:01
Operational results on the fully automatic LHC collimator alignment / Azzopardi, Gabriella (CERN ; U. Malta) ; Salvachua, Belen (CERN) ; Valentino, Gianluca (U. Malta) ; Redaelli, Stefano (CERN) ; Muscat, Adrian (U. Malta)
The Large Hadron Collider has a complex collimation system installed to protect its sensitive equipment from normal and abnormal beam losses. The collimators are set around the beam following a multistage transverse setting hierarchy. [...]
2019 - 15 p. - Published in : Phys. Rev. Accel. Beams 22 (2019) 093001 Fulltext from publisher: PDF;

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2019-10-09
06:01
Operational performance of the machine protection systems of the Large Hadron Collider during Run 2 and lessons learnt for the LIU/HL-LHC era / Zerlauth, Markus (CERN) ; Antoine, Alain (CERN) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Carlier, Etienne (CERN) ; Charifoulline, Zinour (CERN) ; Denz, Reiner (CERN) ; Goddard, Brennan (CERN) ; Lechner, Anton (CERN) ; Magnin, Nicolas (CERN) et al.
The Large Hadron Collider (LHC) has successfully completed its second operational run in December 2018. To allow for the completion of the diverse physics program at 6.5 TeV, the machine has been routinely operating with stored beam energies up to 300 MJ per beam during high intensity proton runs as well as being frequently reconfigured to allow for special physics runs and important machine development studies. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-THPRB031 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.THPRB031

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