CERN Accelerating science

LHC

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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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2020-09-04
13:15
CAS Proceedings of the 2019 course on High Gradient Wakefield Accelerators, Sesimbra, Portugal, 11–22 March 2019 (Draft version September 4, 2020)   11 - 22 Mar 2019  - Sesimbra, Portugal  / Schmickler, Hermann (CERN)
The CAS course on "High Gradient Wakefiled Accelerators" is part of the so called topical CAS courses, which are intended to give during two weeks a deep understanding of simulation and modelling tools used for the design, construction and operation of accelerators. Theoretical lectures covered the fundamentals of modern algorithms and techniques as well as a review of the mathematical background and were complemented with case-studies done by the students in small groups. [...]
Geneva : CERN, 2020 - 345 p. CERN-ACC-2020-0014 Full text

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2020-08-28
16:19
Multiphysics Modelling of the LHC Individually Powered Quadrupole Superconducting Circuits / Murgia, Federica
This thesis describes the generation and the validation of the models of LHC Individually-Powered Quadrupole (IPQ) superconducting circuits [...]
CERN-THESIS-2020-102 -

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2020-08-28
08:46
Upgrade of the Arc Interconnection Verification System for the Large Hadron Collider / Bednarski, Mikolaj (Cracow, INP) ; Jurkiewicz, Piotr (Cracow, INP) ; Ludwin, Jaromir (Cracow, INP) ; Wojas, Damian (Cracow, INP) ; Bednarek, Mateusz (CERN) ; D'Angelo, Giorgio (CERN)
This article presents the design and construction of a new version of an automated, highly efficient system for validation of connections between superconducting magnets in the Large Hadron Collider at CERN, Genève, Switzerland.The design of the new version is based on the existing comprehensive system for electrical measurements and is its integral part. The new system is dedicated to perform multi channel resistance measurements and is to be used during machine assembly and magnets replacement..
IEEE, 2019 - 5 p. - Published in : 10.23919/MIXDES.2019.8787158
In : 26th International Conference on Mixed Design of Integrated Circuits and System, Rzeszow, Poland, 27 - 29 Jun 2019, pp.106-110

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2020-08-22
06:50
Fitting fixed-target and ion collisions in the LHCb Gauss simulation framework / Massacrier, Laure (Orsay, IPN) ; Popov, Dmitry (Birmingham U. ; Heidelberg, Max Planck Inst.) ; Robbe, Patrick (Orsay, LAL) ; Winn, Michael (IRFU, Saclay, DPHN)
The LHCb experiment has been operating in various beam configurations in Run 1 and 2 of the LHC, with collisions of lead ion beams or in a fixed-target setup. In order to analyse these data, the Gauss simulation software has been extended to be able to generate events describing these configurations, based mainly on the EPOS event generator. [...]
EDP Sciences, 2019 - 4 p. - Published in : EPJ Web Conf. 214 (2019) 02023 Fulltext: PDF;
In : 23rd International Conference on Computing in High Energy and Nuclear Physics, CHEP 2018, Sofia, Bulgaria, 9 - 13 Jul 2018, pp.02023

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2020-08-13
11:16
PROTON-BEAM MACRO-PARTICLE INTERACTION: BEAM DUMPS AND QUENCHES / Auchmann, Bernhard (CERN) ; Baer, Thomas Martin ; Lechner, Anton (CERN) ; Riegler, Werner (CERN) ; Rowan, Scott ; Schindler, Heinrich (CERN) ; Schmidt, Rudiger (GSI - Helmholtzzentrum fur Schwerionenforschung GmbH (DE)) ; Zimmermann, Frank (CERN)
We derive a model for the time evolution of beam losses due to macro particles falling into the LHC proton beam. [...]
CERN-ACC-NOTE-2020-0041.
- 2014. - 19 p.
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