CERN Accelerating science

Accelerator Physics

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2018-09-19
15:03
Electron Cloud Effects in the Circulant Matrix Model / Gottlob, Emmanuel Markus
The existing models for the electron cloud driven instabilities either reduce the complexity of the cloud dynamics to the one of an impedance, in order to use well established analytical beam stability models or rely on large computational power for full description of this dynamics by macro-particl [...]
CERN-THESIS-2018-160 - 25 p.

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2018-09-12
04:58
Assessment of Transverse Instabilities in Proton Driven Hollow Plasma Wakefield Acceleration / Li, Y.M. (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Xia, G.X. (Manchester U. ; Cockcroft Inst. Accel. Sci. Tech.) ; Zhao, Yuan (Manchester U.)
Hollow plasma has been introduced into the proton-driven plasma wakefield accelerators to overcome the issue of beam quality degradation caused by the nonlinear transverse wakefields varying in radius and time in uniform plasma. It has been demonstrated in simulations that the electrons can be accelerated to energy frontier with well-preserved beam quality in a long hollow plasma channel. [...]
arXiv:1805.03262.- 2018-06 - 4 p. - Published in : 10.18429/JACoW-IPAC2018-TUPML022 Fulltext: 1805.03262 - PDF; tupml022 - PDF;
In : 9th International Particle Accelerator Conference, Vancouver, Canada, 29 Apr - 4 May 2018, pp.TUPML022

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2018-08-15
23:32
Validation of the LNE51 AEGIS transfer line optics and electrostatic deflector / Bass, Rachel Miranda
The Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEGIS) will move from its current location to another area within the Antiproton Decelerator (AD) hall. [...]
CERN-STUDENTS-Note-2018-029.
- 2018.
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2018-08-13
15:09
Review of path-length calculations for rectangular bending magnets with arbitrary pole-face angles / Berrig, Olav Ejner (CERN)
This document shows how to calculate the path-length of rectangular bending magnets in a beam line. [...]
CERN-ACC-NOTE-2018-0059.
- 2017. - 9 p.
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2018-08-10
09:55
Studies on potential use and needs of a wideband feedback system for the HL-LHC / Li, Kevin Shing Bruce (CERN) ; Arduini, Gianluigi (CERN) ; Hofle, Wolfgang (CERN) ; Iadarola, Giovanni (CERN) ; Komppula, Jani Paavo Olavi (CERN) ; Metral, Elias (CERN) ; Tomas Garcia, Rogelio (CERN)
Transverse feedback systems are one of the crucial and fundamental devices needed in high brightness proton synchrotrons to ensure a reliable and stable operation. [...]
CERN-ACC-NOTE-2018-0058.
- 2018. - 16 p.

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2018-08-09
12:13
The impact of the use of alternative RF frequencies on the TMCI thresholds for HL-LHC / Li, Kevin Shing Bruce (CERN) ; Arduini, Gianluigi (CERN) ; Iadarola, Giovanni (CERN) ; Metral, Elias (CERN) ; Rumolo, Giovanni (CERN) ; Tomas Garcia, Rogelio (CERN)
Alternative scenarios for using different configurations of RF frequencies exist and are under study for the HL-LHC. [...]
CERN-ACC-NOTE-2018-0057.
- 2018. - 9 p.

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2018-08-01
11:15
An Updated Global Optics Correction Scheme / Dilly, Joschua Werner (Ministere des affaires etrangeres et europeennes (FR)) ; Malina, Lukas (CERN) ; Tomas Garcia, Rogelio (CERN)
Currently, the linear global correction scheme implemented in the OMC software uses responses to the available correctors, computed as difference quotients by MAD-X requiring appropriate step-size. [...]
CERN-ACC-NOTE-2018-0056.
- 2018. - 15 p.
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2018-07-24
15:55
MD 2563: Optics measurement and corrections with half integer tune / Wegscheider, Andreas (Hamburg University (DE)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Dilly, Joschua Werner (Ministere des affaires etrangeres et europeennes (FR)) ; Fartoukh, Stephane (CERN) ; Fol, Elena (Johann-Wolfgang-Goethe Univ. (DE)) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Maclean, Ewen Hamish (University of Malta (MT)) ; Papaphilippou, Yannis (CERN) ; Pellegrini, Dario (CERN) ; Persson, Tobias Hakan Bjorn (CERN) et al.
This note reports on the optics measurement and correction actions that were performed during the study of the LHC at a working point close to the half integer resonance..
CERN-ACC-NOTE-2018-0055.
- 2018. - 11 p.

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2018-07-23
16:30
Optics measurements and corrections at β∗= 2.5 km / Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Burkhardt, Helmut (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Fol, Elena (Johann-Wolfgang-Goethe Univ. (DE)) ; Maclean, Ewen Hamish (University of Malta (MT)) ; Malina, Lukas (CERN) ; Tomas Garcia, Rogelio (CERN) ; Wegscheider, Andreas (Hamburg University (DE))
This paper reports on the results of the high β∗ (2.5 km) optics measurements and corrections for the LHC at 6.5 TeV in 2016..
CERN-ACC-NOTE-2018-0052.
- 2018. - 18 p.
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2018-07-23
16:20
MD2148: Flat optics / Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Fartoukh, Stephane (CERN) ; Fol, Elena (Johann-Wolfgang-Goethe Univ. (DE)) ; Garcia-Tabares Valdivieso, Ana (Universidad Complutense (ES)) ; Maclean, Ewen Hamish (University of Malta (MT)) ; Malina, Lukas (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Skowronski, Piotr Krzysztof (CERN) ; Solfaroli Camillocci, Matteo (CERN) ; Tomas Garcia, Rogelio (CERN) et al.
This note reports on the first attempt to measure and correct optics errors at β∗=60/30 cm and β∗=60/15 cm flat optics. [...]
CERN-ACC-NOTE-2018-0051.
- 2018. - 14 p.
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