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ATS Notes

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2017-08-01
17:09
Performance of space charge simulations using High Performance Computing (HPC) cluster / Bartosik, Hannes (CERN) ; Rumolo, Giovanni (CERN)
In 2016 a collaboration agreement between CERN and Istituto Nazionale di Fisica Nucleare (INFN) through its Centro Nazionale Analisi Fotogrammi (CNAF, Bologna) was signed [1], which foresaw the purchase and installation of a cluster of 20 nodes with 32 cores each, connected with InfiniBand, at CNAF for the use of CERN members to develop parallelized codes as well as conduct massive simulation campaigns with the already available parallelized tools. [...]
CERN-ACC-NOTE-2017-0048. - 2017. - 3 p.
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2017-08-01
16:57
PSB Chromaticity Correction in both Planes / Bartosik, Hannes (CERN) ; Schmidt, Frank (CERN)
In view of the LHC injector upgrade program (LIU[1]), all LHC pre-accelerators and in particular the CERN Booster (PSB) are being reviewed for potential lattice optics and equipment optimizations. [...]
CERN-ACC-NOTE-2017-0047. - 2017. - 6 p.
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2017-06-20
09:57
Limitations due to strong head-on beam-beam interactions (MD 1434) / Buffat, Xavier (CERN) ; Furuseth, Sondre Vik ; Iadarola, Giovanni (CERN) ; Papadopoulou, Parthena Stefania (University of Crete (GR)) ; Papaphilippou, Yannis (CERN) ; Pellegrini, Dario (CERN) ; Pojer, Mirko (CERN) ; Crockford, Guy (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Trad, Georges (CERN) et al.
The results of an experiment aiming at probing the limitations due to strong head on beam-beam interactions are reported. [...]
CERN-ACC-NOTE-2017-0044. - 2017. - 11 p.
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2017-06-13
13:59
FESA class for off-momentum lossmaps and decomposition of beam losses at LHC / Wyszynski, Michal Jakub (Warsaw University of Technology (PL)) ; Jackson, Stephen (CERN) ; Pojer, Mirko (CERN) ; Salvachua Ferrando, Belen Maria (CERN) ; Valentino, Gianluca (University of Malta (MT))
The project consisted of two main parts. [...]
CERN-ACC-NOTE-2017-0043. - 2016. - 24 p.
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2017-05-24
09:29
THERMOPHYSICAL AND MECHANICAL CHARACTERIZATION OF ADVANCED MATERIALS FOR THE LHC COLLIMATION SYSTEM / Bianchi, Laura (Universita & INFN, Pisa (IT))
The aim of the thesis is to describe the methods employed for the thermo-physical and mechanical characterization and to show the results of the campaign conducted over two ceramic matrix composites, CFC FS140® and MG-6403-Fc, which are candidates as jaws materials in the LHC collimation system. [...]
CERN-ACC-NOTE-2017-0038. - 2017. - 133 p.

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2017-05-15
14:08
Effect of a resonant excitation on the evolution of the beam emittance and halo population / Fitterer, Miriam (Fermi National Accelerator Lab. (US)) ; Stancari, Giulio (Fermi National Accelerator Lab. (US)) ; Valishev, Alexander (Fermi National Accelerator Lab. (US)) ; Bruce, Roderik (CERN) ; Papadopoulou, Parthena Stefania (University of Crete (GR)) ; Papotti, Giulia (CERN) ; Pellegrini, Dario (CERN) ; Redaelli, Stefano (CERN) ; Trad, Georges (CERN) ; Valuch, Daniel (CERN) et al.
Collimation with hollow electron beams or lenses (HEL) is currently one of the most promising concepts for active halo control in HL-LHC. [...]
CERN-ACC-NOTE-2017-0037. - 2017. - 42 p.
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2017-05-10
11:04
Global compensation of long-range beam-beam effects with octupole magnets: dynamic aperture simulations for the HL-LHC case and possible usage in LHC and FCC. / Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH)) ; Pieloni, Tatiana (Ecole Polytechnique Federale de Lausanne)
The Large Hadron Collider has shown with various experimental verifications that one of the main limitations to the collider performance and to a possible upgrade can come from the long-range beam-beam effects which will define the operational parameters (intensities and emittances) and machine set-up (crossing angles and the minimum beta function at the interaction points). [...]
CERN-ACC-NOTE-2017-0036. - 2017.
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2017-05-10
11:00
Dynamic Aperture Studies for HL-LHC with beam-beam effects / Pieloni, Tatiana (Paul Scherrer Institut (CH)) ; Banfi, Danilo ; Barranco Garcia, Javier (Ecole Polytechnique Federale de Lausanne (CH))
Various possible operational scenarios are foreseen for the High Luminosity Large Hadron Collider (HL-LHC). [...]
CERN-ACC-NOTE-2017-0035. - 2017.

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2017-05-10
10:16
Calculation of Wakefields for the New Design of the LHCb Vertex Locator / Wanzenberg, Rainer (Deutsches Elektronen-Synchrotron (DE)) ; Zagorodnova, Olga (Deutsches Elektronen-Synchrotron (DE))
The upgrade of the LHCb detector in the LHCb experiment was planned in 2011. [...]
CERN-ACC-NOTE-2017-0034. - 2016. - 19 p.
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2017-05-10
10:03
Calculation of Wakefields and Higher Order Modes for the New Design of the Vacuum Chamber of the ALICE Experiment for the HL-LHC / Wanzenberg, Rainer (Deutsches Elektronen-Synchrotron (DE)) ; Zagorodnova, Olga (Deutsches Elektronen-Synchrotron (DE))
The High Luminosity Large Hadron Collider (HL-LHC) project was started with the goal to extend the discovery potential of the Large Hadron Collider (LHC). [...]
CERN-ACC-NOTE-2017-0033. - 2016. - 37 p.
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LHC MD Notes (77)