DocumentCode :
884568
Title :
Quality tests of the LHCb muon chambers at the LNF production site
Author :
Anelli, M. ; Campana, P. ; Dané, E. ; Forti, C. ; Martellotti, G. ; Penso, G. ; Pinci, D. ; Rosellini, R. ; Santoni, M. ; Sarti, A. ; Sciubba, A.
Author_Institution :
Laboratori Nazionali di Frascati, Italian Nat. Inst. of Nucl. Phys., Frascati
Volume :
53
Issue :
1
fYear :
2006
Firstpage :
330
Lastpage :
335
Abstract :
The performance demanded for the Level-0 trigger of LHCb imposes very stringent requirements on the quality of the muon chambers. These chambers must pass a series of tests before being mounted in the experimental setup. The six tests adopted for the quality control of the chambers produced at the Laboratori Nazionali di Frascati (LNF) are described. After the wires are wound and glued on a cathode panel, the wire pitch is measured by two digital cameras with a precision of about 20 mum. The mechanical tension of the wire is deduced from its mechanical resonance frequency measured by an automated system based on a digital electrostatic method. The wire tension is obtained with a precision of about 1%. Once all elements are assembled, the gas tightness of a chamber is verified by monitoring the decrease rate of an overpressure applied to it. After a suitable high-voltage conditioning, the dark current is recorded and the gas gain uniformity of the chamber is measured using a collimated 137Cs source which can be moved over the chamber surface. Finally, the detector is fully equipped with the front-end electronics, and its detection efficiency is tested with cosmic rays
Keywords :
cosmic ray apparatus; multiwire proportional chambers; muon detection; LHCb muon chambers; cathode panel; collimated 137Cs source; cosmic rays; dark current; digital cameras; digital electrostatic method; front-end electronics; gas gain uniformity; high-voltage conditioning; level-0 trigger; multiwire proportional chambers; wire mechanical resonance frequency; wire mechanical tension; wire pitch; Cathodes; Digital cameras; Electronic equipment testing; Electrostatic measurements; Laboratories; Mesons; Production; Quality control; Wire; Wounds; Multiwire proportional chamber; particle gaseous detector; quality control;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/TNS.2006.869836
Filename :
1610998
Link To Document :
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