CERN Accelerating science

Accelerators & Technology Sector Notes

Latest additions:
2017-09-21
11:12
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. [...]
CERN-ACC-NOTE-2017-0052.
- 2017.

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2017-09-20
12:25
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 [...]
CERN-ACC-NOTE-2017-0051.
- 2017. - 6 p.
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2017-08-28
09:05
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. [...]
CERN-ACC-NOTE-2017-0050.
- 2017. - 9 p.
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2017-08-25
13:41
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. [...]
CERN-ACC-NOTE-2017-0049.
- 2017. - 23 p.
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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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LHC MD Notes (81)