CERN Accelerating science

Accelerators & Technology Sector Notes

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Simulation studies on the electron cloud build-up in the elements of the LHC Arcs at 6.5 TeV / Dijkstal, Philipp (Technische Universitaet Darmstadt (DE)) ; Iadarola, Giovanni (CERN) ; Mether, Lotta (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Rumolo, Giovanni (CERN)
The formation of electron clouds in the arcs of the Large Hadron Collider (LHC) has been identified as one of the main limitations for the performance of the machine. [...]
- 2017. - 27 p.
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Electromagnetic fields and Green functions in elliptical vacuum chambers / Persichelli, Serena ; Biancacci, Nicolo (CERN) ; Migliorati, Mauro ; Palumbo, Luigi (Universita di Roma 'La Sapienza', and INFN Sez. Roma1, Rome, Italy) ; Vaccaro, Vittorio (Universita e INFN, Napoli (IT))
In this paper, we discuss the electromagnetic interaction between a point charge travelling inside a waveguide of elliptical cross section, and the waveguide itself. [...]
- 2017. - 22 p.
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Emittance Measurements For Future LHC Beams Using The PS Booster Measurement Line / Abelleira, Jose ; Hanke, Klaus (CERN) ; Mikulec, Bettina (CERN) ; Di Giovanni, Gian Piero (CERN)
The CERN PS Booster measurement line contains three pairs of SEM grids separated by drift space that measures the beam size in both planes. [...]
- 2017. - 8 p.
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A&T Sector Note on the PS transverse feedback / Coly, Marcel (CERN) ; Cotte, Denis Gerard (CERN) ; Blas, Alfred (CERN) ; Sterbini, Guido (CERN)
In a particle accelerator, several contributions can degrade the beam quality and particularly the beam transverse emittance. [...]
- 2017.
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LHC Availability 2017: Technical Stop 1 to Technical Stop 2 / Todd, Benjamin (CERN) ; Ponce, Laurette (CERN) ; Apollonio, Andrea (CERN) ; Walsh, David John (CERN)
This document summarises the LHC machine availability for the period of Technical Stop 1 (TS1) to Technical Stop 2 (TS2) in 2017. [...]
- 2017. - 14 p.
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beta* leveling with telescopic ATS squeeze (MD 2410) / Wenninger, Jorg (CERN) ; Fuchsberger, Kajetan (CERN) ; Hostettler, Michi (Universitaet Bern (CH)) ; Pojer, Mirko (CERN) ; Ponce, Laurette (CERN) ; Tydecks, Tobias (CERN)
Luminosity leveling by beta* is the baseline operational scenario of HL-LHC, and this leveling technique may be used in 2018 or during run~3 depending on the beam parameters and beta* range. [...]
- 2017.
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MD1405: Demonstration of forced dynamic aperture measurements at injection / Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Maclean, Ewen Hamish (CERN) ; Persson, Tobias Hakan Bjorn (CERN) ; Tomas Garcia, Rogelio (CERN)
Accurate measurements of dynamic aperture become more important for the LHC as it advances into increasingly nonlinear regimes of operations, as well as for the High Luminosity LHC where machine nonlinearities will have a significantly larger impact [...]
- 2017. - 6 p.
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Estimates of power generated from synchrotron radiation in the HL-LHC experimental insertion regions / Rossi, Adriana (CERN) ; De Maria, Riccardo (CERN)
The power generated in single magnets of the HL-LHC experimental regions is estimated for collision optics HLLHCV1.2 β*=15 cm Round and HLLHCV1.2 Flat. [...]
- 2017. - 9 p.
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End-of-Fill Diffusion and Halo Population Measurements with Physics Beams at 6.5 TeV / Valentino, Gianluca ; Bruce, Roderik (CERN) ; Gorzawski, Arkadiusz ; Redaelli, Stefano (CERN) ; Trad, Georges (CERN) ; Wagner, Joschka (Johann-Wolfgang-Goethe Univ. (DE)) ; Xu, Chen (CERN)
Beam halo measurements at 6.5 TeV in the LHC were conducted with a full physics beam via collimator scrapings in end-of-fill MDs carried out in May and July 2016. [...]
- 2017. - 23 p.
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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. [...]
- 2017. - 3 p.
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LHC MD Notes (81)