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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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2018-08-30
14:52
Electron cloud studies for the LHC TDI and HL-LHC TDIS / Skripka, Galina (CERN) ; Iadarola, Giovanni (CERN)
The LHC injection beam stopper (TDI) is designed to protect the machine in case of injection kicker malfunctioning. [...]
CERN-ACC-NOTE-2018-0060. - 2018.

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2018-08-25
06:58
Diamond beam monitors for intense primary particle beams / Bol, Johannes
IEKP-KA-2006-8. - 2006. - 164 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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2018-08-02
10:32
Modelling and Analysis of the Electrical and Thermal Transients following the Quench of a Superconducting Electromagnetic Coil within the Large Hadron Collider’s Inner Triplet System / Rowan, Scott
Operators of complex machinery must always think ahead to consider possible future operational threats to, or limitations of, the system [...]
CERN-THESIS-2012-492 - 107 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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2018-07-24
10:28
Report from LHC MD 2171: Dynamic aperture at 6.5 TeV / Maclean, Ewen Hamish (University of Malta (MT)) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Giovannozzi, Massimo (CERN) ; Tomas Garcia, Rogelio (CERN)
Throughout the LHC’s first and second operational runs, increasing emphasis has been placed on the study of nonlinear single-particle beam dynamics [...]
CERN-ACC-NOTE-2018-0054. - 2018. - 25 p.

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2018-07-23
16:35
Crystal Collimation During the LHC Energy Ramp / Rossi, Roberto (Sapienza Universita e INFN, Roma I (IT)) ; Aberle, Oliver (CERN) ; Andreassen, Odd Oyvind (CERN) ; Butcher, Mark (CERN) ; Dionisio Barreto, Cristovao Andre (CERN) ; Masi, Alessandro (CERN) ; Mirarchi, Daniele (University of Manchester (GB)) ; Montesano, Simone (CERN) ; Lamas Garcia, Inigo (CERN) ; Redaelli, Stefano (CERN) et al.
During this MD, performed on October the 30th, 2016, bent silicon crystals and their goniometers were tested with proton beams for a possible usage of crystal-assisted collimation during the LHC energy ramp. [...]
CERN-ACC-NOTE-2018-0053. - 2016. - 7 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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