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CERN Accelerating science

All CERN Accelerators documents

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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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2021-06-22
04:44
Beam-based aperture measurements with movable collimator jaws as performance booster of the CERN Large Hadron Collider / Fuster-Martínez, N. (Valencia U., IFIC ; CERN) ; Aßmann, R.W. (DESY) ; Bruce, R. (CERN) ; Giovannozzi, M. (CERN) ; Hermes, P. (CERN) ; Mereghetti, A. (CERN) ; Mirarchi, D. (CERN) ; Redaelli, S. (CERN) ; Wenninger, J. (CERN)
The beam aperture of a particle accelerator defines the clearance available for the circulating beams and is a parameter of paramount importance for the accelerator performance. [...]
arXiv:2106.09656.
- 21 p.

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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
09:48
Category Accelerators and storage rings - CERN-OBJ-AC-076.
Slice through an LHC bending magnet
Building 282


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2021-06-18
09:41
Category Accelerators and storage rings - CERN-OBJ-AC-075.
Slice through an LHC focusing magnet
Coupe quadripôle

Building 282


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2021-06-18
06:16
First demonstration of the use of crab cavities on hadron beams / Calaga, R (CERN) ; Alekou, A (Manchester U.) ; Antoniou, F (CERN) ; Appleby, R B (Manchester U.) ; Arnaudon, L (CERN) ; Artoos, K (CERN) ; Arduini, G (CERN) ; Baglin, V (CERN) ; Barriere, S (CERN) ; Bartosik, H (CERN) et al.
Many future particle colliders require beam crabbing to recover geometric luminosity loss from the nonzero crossing angle at the interaction point (IP). A first demonstration experiment of crabbing with hadron beams was successfully carried out with high energy protons. [...]
2021 - 6 p. - Published in : Phys. Rev. Accel. Beams 24 (2021) 062001 Fulltext: PDF;

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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
Optimized injector schemes for FCC-ee positron production / Bai, B (Beijing, Inst. High Energy Phys. ; IJCLab, Orsay ; Beijing, GUCAS) ; Faus-Golfe, A (IJCLab, Orsay) ; Han, Y (IJCLab, Orsay) ; Chaikovska, I (IJCLab, Orsay) ; Zhou, Z (Beijing, Inst. High Energy Phys.) ; Chi, Y (Beijing, Inst. High Energy Phys.) ; Oide, K (CERN ; KEK, Tsukuba) ; Zimmermann, F (CERN)
Injectors and in particular the positron production systems are a crucial element in linear and circular colliders. The proposed FCC-ee injector linac accelerates both electrons and positrons up to 6 GeV in order to be injected into the Pre-Booster Ring (PBR) with a high intensity of 3.5 nC per bunch for the Z running mode. [...]
2021 - 14 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1009 (2021) 165463

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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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