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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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2020-09-30
07:04
Overview on heat loads in the LHC / Iadarola, G (CERN) ; Bradu, B (CERN) ; Dijkstal, P (CERN) ; Mether, L (CERN) ; Rumolo, G (CERN) ; Skripka, G (CERN) ; Tavian, L (CERN)
A consequence of the formation of electron cloud in beam chambers is the deposition of energy on their walls due to electron impacts. In cryogenic devices this can cause a significant heat load for the cryogenics system, posing constraints on machine design and operation At the LHC this effect is found to be quite strong and needs to be addressed to avoid performance limitations in view of the planned HL-LHC upgrade. [...]
2020 - 8 p. - Published in : CERN Yellow Rep. Conf. Proc. 7 (2020) 51-58 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.51-58 (CERN-2020-007)

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2020-09-30
07:04
Investigating the role of photoemission in the e-cloud formation at the LHC / Dijkstal, P (CERN) ; Iadarola, G (CERN) ; Mether, L (CERN) ; Rumolo, G (CERN)
The presence of electron clouds at the LHC gives rise to sev-eral problems, among them is the heat deposited by the elec-trons on the beam screens of the superconducting magnets,which constitutes a significant load for the cooling system.To improve the understanding of this phenomenon, simula-tion studies of the e-cloud build-up are performed using thededicated simulation tool PyECLOUD. Photoelectrons gen-erated by synchrotron radiation can significantly enhancethe e-cloud formation. [...]
2020 - 12 p. - Published in : CERN Yellow Rep. Conf. Proc. 7 (2020) 39-50 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.39-50 (CERN-2020-007)

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2020-09-25
11:23
Can an extra HOM-like impedance explain the high octupole threshold at Q′ ∼ 0 in the LHC? / Antipov, Sergey ; Biancacci, Nicolo (CERN) ; Metral, Elias (CERN)
The 2015 LHC octupole threshold measurement campaign revealed a higher Landau octupole current between the measured octupole threshold and impedance model predictions for chromaticities below few units. [...]
CERN-ACC-NOTE-2020-0051. - 2020. - 13 p.

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2020-09-25
11:02
Numerical simulations studies on single-bunch instabilities driven by electron clouds at the LHC / Sabato, Luca (CERN) ; Iadarola, Giovanni (CERN) ; Mether, Lotta (CERN)
Instabilities driven by electron clouds in the LHC are studied by means of numerical simulations performed with the PyECLOUD-PYHEADTAIL suite. [...]
CERN-ACC-NOTE-2020-0050. - 2020. - 29 p.
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2020-09-25
10:47
MD 3603: Dynamic Aperture with uncorrected dipole b3 / Hofer, Michael (Vienna University of Technology (AT)) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Dilly, Joschua Werner (Humboldt University of Berlin (DE)) ; Fol, Elena (Goethe University Frankfurt (DE)) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Maclean, Ewen Hamish (CERN) ; Malina, Lukas (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Coello De Portugal - Martinez Vazquez, Jaime Maria ; Solfaroli Camillocci, Matteo (CERN) et al.
The hadron collider options currently investigated as part of the FCC study rely on the use of dipoles with a field strength of 16 T or above in order to achieve the targeted collision energy. [...]
CERN-ACC-NOTE-2020-0049. - 2020. - 22 p.
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2020-09-25
10:42
MD3287: Luminosity scans with waist shifts / Coello De Portugal - Martinez Vazquez, Jaime Maria ; Malina, Lukas (CERN) ; Tomas Garcia, Rogelio (CERN)
This note reports on the first measurements of the beam waist displacements in the LHC using luminosity scans. [...]
CERN-ACC-NOTE-2020-0048. - 2020. - 11 p.

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2020-09-07
11:37
LHC Full Energy Exploitation Study: Upgrade for Operation Beyond Ultimate Energy of 7.5TeV / Bruning, Oliver (CERN) ; Apollonio, Andrea (CERN) ; Izquierdo Bermudez, Susana (CERN) ; Bottura, Luca (CERN) ; Brodzinski, Krzysztof (CERN) ; Claudet, Serge (CERN) ; Delikaris, Dimitri (CERN) ; De Maria, Riccardo (CERN) ; Giovannozzi, Massimo (CERN) ; Goddard, Brennan (CERN) et al.
This report looks at the feasibility and limitations of upgrading the HL-LHC for operation beyond the ultimate beam energy of 7.5 TeV by means of replacing a fraction of the nominal LHC dipole magnets with 11 T Nb3Sn magnets [...]
CERN-ACC-2020-0015. - 2020. - 22 p.

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