DocumentCode :
3611995
Title :
MPX Detectors as LHC Luminosity Monitor
Author :
Sopczak, Andre ; Ali, Babar ; Asbah, Nedaa ; Bergmann, Benedikt ; Bekhouche, Khaled ; Caforio, Davide ; Campbell, Michael ; Heijne, Erik ; Leroy, Claude ; Lipniacka, Anna ; Nessi, Marzio ; Pospisil, Stanislav ; Seifert, Frank ; Solc, Jaroslav ; Soueid, Pa
Author_Institution :
CTU, IEAP, Prague, Czech Republic
Volume :
62
Issue :
6
fYear :
2015
Firstpage :
3225
Lastpage :
3241
Abstract :
A network of 16 Medipix-2 (MPX) silicon pixel devices was installed in the ATLAS detector cavern at CERN. It was designed to measure the composition and spectral characteristics of the radiation field in the ATLAS experiment and its surroundings. This study demonstrates that the MPX network can also be used as a self-sufficient luminosity monitoring system. The MPX detectors collect data independently of the ATLAS data-recording chain, and thus they provide independent measurements of the bunch-integrated ATLAS/LHC luminosity. In particular, the MPX detectors located close enough to the primary interaction point are used to perform van der Meer calibration scans with high precision. Results from the luminosity monitoring are presented for 2012 data taken at √s = 8 TeV proton-proton collisions. The characteristics of the LHC luminosity reduction rate are studied and the effects of beam-beam (burn-off) and beam-gas (single bunch) interactions are evaluated. The systematic variations observed in the MPX luminosity measurements are below 0.3% for one minute intervals.
Keywords :
calibration; position sensitive particle detectors; silicon radiation detectors; ATLAS data-recording chain; ATLAS detector cavern; ATLAS experiment; CERN; LHC luminosity monitor; LHC luminosity reduction rate; MPX detectors; MPX network; Medipix-2 silicon pixel devices; beam-beam interactions; beam-gas interactions; bunch-integrated ATLAS luminosity; bunch-integrated LHC luminosity; electron volt energy 8 TeV; luminosity monitoring system; proton+proton collisions; radiation field; spectral characteristics; van der Meer calibration scans; Atmospheric measurements; Calibration; Detectors; Large Hadron Collider; Particle measurements; Pixel; Silicon; LHC; luminosity; medipix; pixel detectors;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/TNS.2015.2496316
Filename :
7349015
Link To Document :
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