CERN Accelerating science

LHC

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2019-10-16
07:36
LHC optics measurement and correction software progress and plans / Tomás, Rogelio (CERN) ; Cardona, Javier (Colombia, U. Natl.) ; Carlier, Felix (CERN) ; Coello, Jaime (CERN) ; Dilly, Joschua (CERN) ; Fol, Elena (CERN) ; Garcia-Tabares, Ana (CERN) ; Hofer, Michael (CERN) ; Maclean, Ewen (CERN) ; Malina, Lukas (CERN) et al.
LHC Optics Measurements and Corrections (OMC) require efficient on-line software applications to acquire and analyze data and to compute the necessary corrections. During Run 2 various measurement and correction techniques have been merged to yield unprecedented optics quality, increasing the required number of steps to finalize the optics commissioning and the size of the software project. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPGW116 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPGW116

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2019-10-16
07:36
Unsupervised machine learning for detection of faulty beam position monitors / Fol, Elena (CERN ; Goethe U., Frankfurt (main)) ; Coello de Portugal, Jaime Maria (CERN) ; Tomás, Rogelio (CERN)
Unsupervised learning includes anomaly detection techniques that are suitable for the detection of unusual events such as instrumentation faults in particle accelerators. In this work we present the application of a decision trees-based algorithm to faulty BPMs detection at the LHC. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPGW081 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPGW081

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2019-10-16
07:35
Machine protection aspects of high-voltage flashovers of the LHC beam dump dilution kickers / Wiesner, Christoph (CERN) ; Bartmann, Wolfgang (CERN) ; Bracco, Chiara (CERN) ; Calviani, Marco (CERN) ; Carlier, Etienne (CERN) ; Ducimetière, Laurent (CERN) ; Frankl, Matthias (CERN) ; Fraser, Matthew (CERN) ; Gilardoni, Simone (CERN) ; Goddard, Brennan (CERN) et al.
The LHC Beam Dump System is required to safely dispose of the energy of the stored beam. In order to reduce the energy density deposited in the beam dump, a dedicated dilution system is installed. [...]
2019 - 4 p. - Published in : 10.18429/JACoW-IPAC2019-WEPMP040 Fulltext from publisher: PDF;
In : 10th International Particle Accelerator Conference, Melbourne, Australia, 19 - 24 May 2019, pp.WEPMP040

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2019-10-15
16:04
Electrical resistance of the solder connections for the consolidation of the LHC main interconnection splices / Lutum, Robin (FH Aachen)
For the consolidation of the LHC main interconnection splices it is planned to solder shunts onto each of the 10,170 splices. The solder that has been selected for this purpose is Sn60Pb40. [...]
CERN-THESIS-2011-443.- 40 p. Fulltext: CERN-THESIS-2011-443 - PDF; CERN-THESIS-2011-443_2 - PDF; External link: Approve this document (restricted)

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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 Preprint: 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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