The CAST time projection chamber

被引：28
|
作者：
Autiero, D.
Beltran, B.
Carmona, J. M.
Cebrian, S.
Chesi, E.
Davenport, M.
Delattre, M.
Di Lella, L.
Formenti, F.
Irastorza, I. G.
Gomez, H.
Hasinoff, M.
Lakic, B.
Luzon, G.
Morales, J.
Musa, L.
Ortiz, A.
Placci, A.
Rodrigurez, A.
Ruz, J. [1 ]
Villar, J. A.
Zioutas, K.
机构：
[1] Univ Zaragoza, Lab Fis Nucl & Altas Energias, Zaragoza, Spain
[2] CERN, European Org Nucl Res, CH-1211 Geneva 23, Switzerland
[3] Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada
[4] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V5Z 1M9, Canada
[5] Rudjer Boskovic Inst, Zagreb, Croatia
[6] Univ Patras, Patras, Greece
来源：
NEW JOURNAL OF PHYSICS | 2007年 / 9卷
关键词：
D O I：
10.1088/1367-2630/9/6/171
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
One of the three x- ray detectors of the CERN Axion Solar Telescope ( CAST) experiment searching for solar axions is a time projection chamber ( TPC) with a multi-wire proportional counter ( MWPC) as a readout structure. Its design has been optimized to provide high sensitivity to the detection of the low intensity x- ray signal expected in the CAST experiment. A low hardware threshold of 0.8 keV is set to a safe level during normal data taking periods, and the overall efficiency for the detection of photons coming from conversion of solar axions is 62%. Shielding has been installed around the detector, lowering the background level to 4.10 x 10(-5) counts cm(-2) s(-1) keV- between 1 and 10 keV. During phase I of the CAST experiment the TPC has provided robust and stable operation, thus contributing with a competitive result to the overall CAST limit on axion- photon coupling and mass.
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页数：16
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