CERN Accelerating science

Accelerators & Technology Sector Notes

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2018-01-15
15:26
β∗ levelling using the LHC Lumi Server (MD 2427) / Hostettler, Michi (Universitaet Bern (CH)) ; Calia, Andrea (Ministere des affaires etrangeres et europeennes (FR)) ; Fuchsberger, Kajetan (CERN) ; Gabriel, Mathieu (CERN) ; Hemelsoet, Georges-Henry (CERN) ; Hruska, Marek (CERN) ; Jacquet, Delphine (CERN) ; Wenninger, Jorg (CERN)
Luminosity levelling by β∗ is the baseline scenario for HL-LHC and will possibly be used in 2018 LHC operation. [...]
CERN-ACC-NOTE-2018-0001.
- 2018. - 10 p.
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2017-12-22
10:53
Analysis of the beam induced heat loads on the LHC arc beam screens during Run 2 / Iadarola, Giovanni (CERN) ; Rumolo, Giovanni (CERN) ; Dijkstal, Philipp (Technische Universitaet Darmstadt (DE)) ; Mether, Lotta (EPFL - Ecole Polytechnique Federale Lausanne (CH))
During Run 2 the Large Hadron Collider (LHC) has been routinely operated with 25 ns bunch spacing [...]
CERN-ACC-NOTE-2017-0066.
- 2017. - 71 p.

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2017-12-20
15:28
Study of off-momentum losses at the start of the ramp in the Large Hadron Collider / Wretborn, Sven Joel (Linkoeping University (SE)) ; Bruce, Roderik (CERN) ; Garcia Morales, Hector (University of London (GB)) ; Sjobaek, Kyrre Ness (University of Oslo (NO))
At the start of the energy ramp at the LHC, any uncaptured beam is quickly lost on the momentum collimators. [...]
CERN-ACC-NOTE-2017-0065.
- 2017. - 37 p.
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2017-12-08
11:44
LHC β*-reach MD: aperture measurements at small β* / Fuster Martinez, Nuria (CERN) ; Bruce, Roderik (CERN) ; Redaelli, Stefano (CERN)
During this MD, performed on the 25th of July 2017, we measured the LHC aperture at top energy for β*=30 cm using the Transverse Damper (ADT) blow-up method. [...]
CERN-ACC-NOTE-2017-0064.
- 2017. - 13 p.
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2017-12-01
10:00
LHC Availability 2017: Standard Proton Physics / Todd, Benjamin (CERN) ; Ponce, Laurette (CERN) ; Apollonio, Andrea (CERN) ; Walsh, David John (CERN)
This document summarises the LHC machine availability for the period from restart to the end of standard proton physics in 2017. [...]
CERN-ACC-NOTE-2017-0063.
- 2017. - 20 p.

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2017-12-01
09:58
LHC Availability 2017: Technical Stop 2 to End of Standard Proton Physics / 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 2 (TS2) to the end of standard proton physics in 2017. [...]
CERN-ACC-NOTE-2017-0062.
- 2017. - 14 p.

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2017-11-30
09:42
EM-Measurements and Evaluation of the XRP (Roman Pot to be installed with UA9 Experiment) / Farricker, Aaron (CERN) ; Popovic, Branko Kosta (CERN) ; Sunar, Ezgi ; Vollinger, Christine (CERN)
This Note discusses the EM-measurements and the impedance evaluation carried out on the XRP-experimental roman pot to complement the installation of the UA9 Experiment layout in the SPS for studies with a double-crystal setup (ECR SPS-TECS-EC-0001) implemented in 2017. [...]
CERN-ACC-NOTE-2017-0061.
- 2017. - 12 p.

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2017-11-08
12:21
MD 979: Beta-beating measurements on colliding beams / Goncalves Jorge, Patrik ; Barranco Garcia, Javier (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Pieloni, Tatiana (EPFL - Ecole Polytechnique Federale Lausanne (CH)) ; Buffat, Xavier (CERN) ; Carlier, Felix Simon (Technische Universiteit Delft (NL)) ; Coello De Portugal - Martinez Vazquez, Jaime Maria (Universitat Politecnica Catalunya (ES)) ; Fol, Elena (University of Applied Sciences (DE)) ; Langner, Andy Sven (CERN) ; Medina Medrano, Luis Eduardo (Universidad de Guanajuato (MX)) ; Olexa, Jakub (CERN) et al.
The HL-LHC high brightness beams will give a large β-beating due to the head-on and long-range interactions since a beam-beam parameter of 0.01 per Interaction Point (IP) is expected. [...]
CERN-ACC-NOTE-2017-0060.
- 2017. - 13 p.
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2017-11-06
10:56
FLUKA Monte Carlo Modelling of the CHARM Facility’s Test Area: Update of the Radiation Field Assessment / Infantino, Angelo (CERN)
The present Accelerator Note is a follow-up of the previous report CERN-ACC-NOTE-2016-12345. [...]
CERN-ACC-NOTE-2017-0059.
- 2017. - 38 p.
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2017-10-26
09:53
Automatic Angular alignment of LHC Collimators / Azzopardi, Gabriella (University of Malta (MT)) ; Valentino, Gianluca (University of Malta (MT)) ; Salvachua Ferrando, Belen Maria (CERN) ; Mereghetti, Alessio (CERN) ; Bruce, Roderik (CERN) ; Redaelli, Stefano (CERN)
The LHC is equipped with a complex collimation system to protect sensitive equipment from unavoidable beam losses [...]
CERN-ACC-NOTE-2017-0058.
- 2017. - 10 p.
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LHC MD Notes (85)