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2020-10-27
17:01
Impact and possible mitigation measures in case of failure of lattice sextupole and octupole circuits in Run 3 / Fartoukh, Stephane (CERN)
Depending on the machine configuration which is used in operation, the failure of some lattice sextupole and octupole circuits might have a substantial impact on the machine performance (β∗ and beam brightness limitations). [...]
CERN-ACC-NOTE-2020-0057. - 2020. - 25 p.

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2020-10-27
16:57
Combined ramp and telescopic squeeze: MD 3270 / Fartoukh, Stephane (CERN) ; Azzopardi, Gabriella (CERN) ; Bruce, Roderik (CERN) ; Buffat, Xavier (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; Fuster Martinez, Nuria ; Iadarola, Giovanni (CERN) ; Karastathis, Nikos ; Kostoglou, Sofia (CERN) ; Maclean, Ewen Hamish (CERN) et al.
This paper highlights the outcome of the 2018 round ATS MD program, which aimed at demonstrating the feasibility of a combined ramp and telescopic squeeze as a potential key ingredient to operate the machine in Run 3, with much brighter and more energetic beams with respect to Run 2. [...]
CERN-ACC-2020-0028. - 2020. - 40 p.

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2020-10-27
16:18
MD2490 – Measurement of the TMCI threshold at flat-top in the LHC / Albert, Markus (CERN) ; Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Carver, Lee Robert (University of Liverpool (GB)) ; Fuchsberger, Kajetan ; Mereghetti, Alessio ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) et al.
This report summarizes the results of MD2490 on the measurement of the intensity threshold of the Transverse Mode Coupling Instability (TMCI) in the LHC at flat top. [...]
CERN-ACC-NOTE-2020-0056. - 2020.

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2020-10-06
17:47
MD3310 – Complex tune shift measurement at flat-top in the LHC / Amorim, David (Universite Grenoble-Alpes (FR)) ; Antipov, Sergey ; Biancacci, Nicolo (CERN) ; Buffat, Xavier (CERN) ; Giordano, Francesco (Universita e sezione INFN di Napoli (IT)) ; Hemelsoet, Georges-Henry (CERN) ; Levens, Tom (CERN) ; Metral, Elias (CERN) ; Mounet, Nicolas (CERN) ; Ribes Metidieri, Ariadna (University of Barcelona (ES)) et al.
This note summarises the MD3310 activity. [...]
CERN-ACC-NOTE-2020-0053. - 2020. - 6 p.
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2020-10-03
06:00
A Functional 3D-Printable Magnet Model of the ATLAS Toroid / Woithe, Julia (CERN) ; Jansky, Alexandra (CERN) ; Keller, Oliver (CERN) ; Gonçalves, Tiago (CERN)
The ATLAS detector is the largest particle detector at the LHC and one of the most complex machines ever built. It allows precise measurements of particles emanating from proton collisions. [...]
2020 - 5 p. - Published in : The Physics Educator 02 (2020) 2020002 Fulltext from publisher: PDF;

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2020-10-02
06:50
Elements of QCD for hadron colliders / Salam, G P (CERN)
The aim of these lectures is to provide students with an introduction to some of the core concepts and methods of QCD that are relevant in an LHC context..
2020 - 56 p. - Published in : 10.23730/CYRSP-2020-005.1 Fulltext: PDF;
In : Proceedings of the 2018 Asia–Europe–Pacific School of High-Energy Physics, Quy Nhon, Vietnam, 12 - 25 Sep 2018, pp.1-56 (CERN-2020-005)

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2020-10-01
06:01
Preliminary results obtained with the LHC Vacuum Pilot Sector / Buratin, E (CERN ; Ecole Polytechnique, Lausanne) ; Baglin, V (CERN) ; Henrist, B (CERN)
The Large Hadron Collider (LHC) is affected by electron cloud that reduces the quality of the beam, provokes instabilities, and increases the residual-gas pressure and heat load in the vacuum chambers. Synchrotron radiation, via photoelectron emission, plays also an important role in the electron cloud build-up. [...]
2020 - 6 p. - Published in : CERN Yellow Rep. Conf. Proc. 7 (2020) 195-200 Fulltext from publisher: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.195-200 (CERN-2020-007)

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2020-09-30
07:04
Beam induced dynamic pressure during Run 2 (2015-2018) / Yin Vallgren, C (CERN) ; Ribes Metidieri, P (CERN) ; Bregliozzi, G (CERN)
The LHC successfully returned to operation in April 2015after almost 2 years of Long Shutdown 1 (LS1) for variousupgrade and consolidation programs. During Run 2 (2015 -2018) the LHC operated for more than 3600 fills and it hasreached a total integrated luminosity of more than 150 fb1.This paper summarizes the dynamic vacuum observationsin dierent locations along the LHC during the dedicatedfills as well as during the physics runs with dierent beamparameters. [...]
2020 - 8 p. - Published in : CERN Yellow Rep. Conf. Proc. 7 (2020) 65-72 Fulltext from publisher: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.65-72 (CERN-2020-007)

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2020-09-30
07:04
How does a cryogenic system cope with e-cloud induced heat load? / Bradu, B (CERN) ; Brodzinski, K (CERN) ; Ferlin, G (CERN)
Since 2012, the e-clouds produced by LHC beams are inducing significant dynamic heat loads on the LHC cryogenic system. These additional heat loads are deposited on beam screens where they must be properly extracted by the cryogenic system between 4.6 K and 20 K in order to ensure a stable beam vacuum and a good thermal barrier for superconducting magnets operated at 1.9 K. [...]
2020 - 9 p. - Published in : CERN Yellow Rep. Conf. Proc. 7 (2020) 73-82 Fulltext from publisher: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.73-82 (CERN-2020-007)

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2020-09-30
07:04
Surface characterization of vacuum components extracted from LHC dipole magnet / Petit, V (CERN) ; Neupert, H (CERN) ; Garcia-Tabares, E (CERN) ; Taborelli, M (CERN) ; Belhaj, M (ONERA, Toulouse)
Vacuum components of a dipole magnet exposed to the proton beam in the LHC at CERN were extracted from the LHC ring during the technical stop 2016 – 2017. Chemical analysis as well as Secondary Electron Yield (SEY) meas- urements were performed on their surface after a month of air exposure, to study possible surface modifications induced by the electron cloud bombardment during operation. [...]
2020 - 4 p. - Published in : CERN Yellow Rep. Conf. Proc. 7 (2020) 105-108 Fulltext from publisher: PDF;
In : ECLOUD’18: Proceedings of the Joint INFN-CERN-ARIES Workshop on Electron-Cloud Effects, La Biodola, Isola d'Elba, Italy, 3 - 7 Jun 2018, pp.105-108 (CERN-2020-007)

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