CERN Accelerating science

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1.
Conceptual Design of the HL-LHC Hollow Electron Lens Superconducting Magnet System / Foussat, Arnaud (CERN) ; Bragin, Alexey (Novosibirsk, IYF) ; Ferlin, Gerard (CERN) ; Kirby, Glyn (CERN) ; Kolehmainen, Antti (CERN) ; Nikiforov, Danila (Novosibirsk, IYF) ; Pavliuchenko, Vadim (Novosibirsk, IYF) ; Perini, Diego (CERN) ; Petrone, Carlo (CERN) ; Redaelli, Stefano (CERN) et al.
The Hollow Electron Lens (HEL) units are part of the upgrade baseline of the High-Luminosity LHC accelerator (HL-LHC) and will be installed in the machine ring at point P4 on each counter-rotating LHC proton beamline during a long shutdown in 2025-2027 at CERN. The main goal is to improve the collimation system performance by controlling beam energy loss in the beam halo. [...]
2022 - 5 p. - Published in : IEEE Trans. Appl. Supercond. 32 (2022) 4100905
In : 27th International Conference on Magnet Technology (MT-27), Fukuoka, Japan, 15 - 19 Nov 2021, pp.4100905
2.
Signal Analysis for Automated Diagnostic Applied to LHC Cryogenics / Martensson, Kurt (CERN) ; Bradu, Benjamin (CERN) ; Ferlin, Gerard (CERN)
The operation of the LHC at CERN is highly dependent on its associated infrastructure to operate properly, such as its cryogenic system where many conditions must be fulfilled for superconducting magnets and RF cavities. In 2018, the LHC cryogenic system caused 172 hours of accelerator downtime (out of 5760 running hours). [...]
2020 - 7 p. - Published in : 10.18429/JACoW-ICALEPCS2019-THCPL05
In : 17th Biennial International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS), New York, United States, 5 - 11 Oct 2019, pp.THCPL05
3.
Chapter 9: Cryogenics for the HL-LHC / Claudet, Serge (CERN) ; Ferlin, Gerard (CERN) ; Monneret, Emmanuel (CERN) ; Perin, Antonio (CERN) ; Pirotte, Olivier (CERN) ; Sisti, M (CERN) ; Van Weelderen, Rob (CERN)
The upgrade of the cryogenics for the HL-LHC will consist of the following: - The design and installation of two new cryogenic plants at P1 and P5 for high luminosity insertions. This upgrade will be based on a new sectorization scheme aimed at separating the cooling of the magnets in these insertion regions from the arc magnets and considering the newt feedboxes and superconducting links located in underground infrastructures. - The design and installation of a new cryogenic distribution lines (QXL) at P1 and P5 in the LHC tunnel and in a new underground service galleries. - The upgrade of the existing cryogenic plant (QSRA and QURA) cooling the LHC sector 3-4 located at P4. - The cryogenic design support for superconducting devices, such as magnets, crab cavities, superconducting links, and the hollow electron lenses. Some other options such as new cryogenic circuits at P7 for the HTS links and displaced current feedboxes or a new cryoplant in P4 have been discarded..
2020 - 10 p. - Published in : 10.23731/CYRM-2020-0010.189 Fulltext: PDF;
In : High-Luminosity Large Hadron Collider (HL-LHC): Technical design report, pp.189-198
4.
Adaptation of the Cryogenic System Capacity for the LHC Dynamic Heat Load - Operational Experience / Brodzinski, Krzysztof (CERN) ; Bradu, Benjamin (CERN) ; Claudet, Serge (CERN) ; Delikaris, Dimitri (CERN) ; Delprat, Laurent (CERN) ; Ferlin, Gerard (CERN)
During second LHC physics operation period (Run2), between 2015 and 2018, the accelerator operation modes and beam parameters have been adapted thus allowing significantly improved integrated luminosity production. Increased energy, intensity and adapted beam operation schemes with 25 ns of inter-bunches spacing have an essential influence on the dynamic heat load generation with direct impact on the cryogenic cooling system. [...]
2018 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-WEPMF073 Fulltext: PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.WEPMF073
5.
Beam screen cryogenic control improvements for the LHC run 2 / Bradu, Benjamin (CERN) ; Rogez, Edouard (CERN) ; Blanco Vinuela, Enrique (CERN) ; Ferlin, Gerard (CERN) ; Tovar-Gonzalez, Antonio (CERN)
This paper presents the improvements made on the cryogenic control system for the LHC beam screens. The regulation objective is to maintain an acceptable temperature range around 20 K which simultaneously ensures a good LHC beam vacuum and limits cryogenic heat loads. [...]
CERN-ACC-2016-0106.- Geneva : CERN, 2017 - 9 p. - Published in : IOP Conf. Ser. Mater. Sci. Eng. 171 (2017) 012128 Fulltext: PDF;
In : 26th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2016, New Delhi, India, 7 - 11 Mar 2016, pp.012128
6.
Compensation of Beam Induced Effects in LHC Cryogenic Systems / Bradu, Benjamin (CERN) ; Blanco Viñuela, Enrique (CERN) ; Ferlin, Gerard (CERN) ; Fernández Adiego, Borja (CERN) ; Iadarola, Giovanni (CERN) ; Plutecki, Przemyslaw (CERN) ; Rogez, Edouard (CERN) ; Tovar González, Antonio (CERN)
This paper presents the different control strategies deployed in the LHC cryogenic system in order to compensate the beam induced effects in real-time. LHC beam is inducing important heat loads along the 27 km of beam screens due to synchrotron radiations, image current and electron clouds. [...]
CERN-ACC-2016-282.- 2016 - 4 p. - Published in : 10.18429/JACoW-IPAC2016-TUPMB048 Published version from JACoW: PDF;
In : 7th International Particle Accelerator Conference, Busan, Korea, 8 - 13 May 2016, pp.TUPMB048

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