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CERN Accelerating science

LHC

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2021-06-22
06:00
Precise luminosity determination at CMS / Gadallah, Mahmoud (Eotvos U. ; Res. Group Stat. Biol., Budapest) /CMS Collaboration
Precise luminosity calibration at bunched-beam hadron colliders like the Large Hadron Collider (LHC) is critical to determine fundamental parameters of the standard model and to discover or constrain beyond-the-standard-model phenomena. The results of luminosity determination at LHC interaction point 5 with the Compact Muon Solenoid (CMS) detector, using proton-proton (pp) collisions in 2018, is reported. [...]
SISSA, 2020 - 5 p. - Published in : PoS LHCP2020 (2021) 214
In : 8th Conference of Large Hadron Collider Physics (LHCP), Online, 25 - 30 May 2020, pp.214

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2021-06-18
14:04
Beam-Beam Long-Range Wire Compensation For Enhancing CERN LHC Performance / Poyet, Axel
In high intensity and high energy colliders such as the CERN Large Hadron Collider and its future luminosity upgrade, interactions between the two beams around the different interaction points are one of the machine performance limitations [...]
CERN-THESIS-2021-071 - 156 p.


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2021-06-18
06:16
Preparation and Execution of the Electrical Quality Assurance Program On the LHC Superconducting Circuits During the Second Long Shutdown / Ludwin, Jaromir (CERN) ; Bednarek, Mateusz (CERN) ; Bednarski, Mikolaj (CERN ; Cracow, INP) ; Bielewski, Jaroslaw (CERN ; Cracow, INP) ; Bogdali, Pawel (CERN ; Cracow, INP) ; D'Angelo, Giorgio (CERN) ; Daniluk, Witold (CERN ; Cracow, INP) ; Dutkiewicz, Erazm Maria (CERN ; Cracow, INP) ; Grzadziel, Dominik (CERN ; Cracow, INP) ; Janik, Grzegorz (CERN ; Cracow, INP) et al.
The electrical quality assurance (ELQA) of the superconducting circuits of CERN’s Large Hadron Collider (LHC) during its second Long Shutdown (LS2) requires the execution of vast measurement campaigns. Each of 1658 electrical circuits as well as the instrumentation of each of the 1746 individual cryo-assemblies housing magnets, bus-bars and other components of the superconducting circuits, has to undergo a series of tests. [...]
2021 - 4 p. - Published in : IEEE Trans. Appl. Supercond. 31 (2021) 4002404 Fulltext: PDF;

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2021-06-18
06:16
Simulation of radiation environments / Alici, A (Queen Mary, U. of London (main)) ; Azhgirey, I (Serpukhov, IHEP) ; Dawson, I (Queen Mary, U. of London (main)) ; Huhtinen, M (CERN) ; Ivantchenko, V (Tomsk State U.) ; Kar, D (Witwatersrand U.) ; Karacson, M (CERN) ; Mallows, S (KIT, Karlsruhe) ; Manousos, T (CERN) ; Mandić, I (Stefan Inst., Ljubljana) et al.
Simulating radiation environments is crucial in the design phase of new hadron collider experiments or upgrades, especially when extrapolating to new centre of mass collision energies where previous experience cannot be relied on. The generation of radiation fields in the LHC experiments is dominated by proton–proton collisions, with contributions from beam-gas interactions and other machine losses. [...]
2021 - 24 p. - Published in : 10.23731/CYRM-2021-001.35 Fulltext: PDF;
In : Radiation effects in the LHC experiments: Impact on detector performance and operation, pp.35-58

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2021-06-18
06:16
The LHC machine and experiments / Alici, A (Bologna U.) ; Bomben, M (Paris U., VI-VII) ; Dawson, I (Queen Mary, U. of London) ; Sonneveld, J (Nikhef, Amsterdam)
The Large Hadron Collider is a 26.7 km circular accelerator based on a twin aperture superconducting magnet design with a design proton beam energy of 7 TeV. The four particle physics experiments ALICE, ATLAS, CMS, and LHCb are located around the ring. [...]
Geneva : CERN, 2021 - 12 p. - Published in : 10.23731/CYRM-2021-001.23 Fulltext: PDF;
In : Radiation effects in the LHC experiments: Impact on detector performance and operation, pp.23-34

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2021-06-18
06:16
Overview of radiation effects on detector systems / Dawson, I (Queen Mary, U. of London) ; Faccio, F (CERN) ; Moll, M (CERN) ; Weidberg, A (Oxford U.)
In this section we give an overview of the effects of radiation on silicon detector systems in the LHC experiments. We divide the sections into: sensors; electronics; optoelectronics; services. [...]
2021 - 19 p. - Published in : 10.23731/CYRM-2021-001.3 Fulltext: 3.PDF;
In : Radiation effects in the LHC experiments: Impact on detector performance and operation, pp.3-21

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2021-06-10
06:08
Feasibility of Hardware Acceleration in the LHC Orbit Feedback Controller / Grech, Leander (CERN) ; Alves, Diogo (CERN) ; Jackson, Stephen (CERN) ; Valentino, Gianluca (Malta U.) ; Wenninger, Jorg (CERN)
Orbit correction in accelerators typically make use of a linear model of the machine, called the Response Matrix (RM), that relates local beam deflections to position changes. [...]
2019. - 5 p.

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2021-06-10
06:08
Accelerator Schedule Management at CERN / Urbaniec, Bartlomiej (CERN) ; Roderick, Chris (CERN)
Maximizing the efficiency of operating CERN’s accelerator complex requires careful forward planning, and synchronized scheduling of cross-accelerator events. [...]
2019. - 5 p.

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2021-06-09
06:17
Integrating COTS Equipment in the CERN Accelerator Domain / Andreassen, Odd (CERN) ; Charrondière, Cedric (CERN) ; Develle, Kevin (CERN) ; Rijllart, Adriaan (CERN) ; Rossel, Ralf (CERN) ; Steen, Joergen (CERN) ; Tagg, Joseph (CERN) ; Zilliox, Thomas (CERN)
Successful integration of industrial equipment in the CERN accelerator complex relies mainly on 3 key components. [...]
2019. - 5 p.

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2021-06-09
06:17
Anomaly Detection for CERN Beam Transfer Installations Using Machine Learning / Dewitte, Thiebout (Leuven U.) ; Meert, Wannes (Leuven U.) ; Van Trappen, Pieter (CERN) ; Van Wolputte, Elia (Leuven U.)
Reliability, availability and maintainability determine whether or not a large-scale accelerator system can be operated in a sustainable, cost-effective manner. [...]
2019. - 5 p.

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