Micromegas-TPC operation at high pressure in xenon-trimethylamine mixtures

被引：30

作者：

Cebrian, S. ^{[1
]}

Dafni, T. ^{[1
]}

Ferrer-Ribas, E. ^{[2
]}

Giomataris, I. ^{[2
]}

Gonzalez-Diaz, D. ^{[1
,3
]}

Gomez, H. ^{[1
,4
]}

Herrera, D. C. ^{[1
]}

Iguaz, F. J. ^{[1
]}

Irastorza, I. G. ^{[1
]}

Luzon, G. ^{[1
]}

Rodriguez, A. ^{[1
]}

Segui, L. ^{[1
]}

Tomas, A. ^{[1
]}

机构：

[1] Univ Zaragoza, Lab Fis Nucl & Astroparticulas, E-50009 Zaragoza, Spain

[2] CEA Saclay, Ctr Etudes Nucl Saclay, IRFU, F-91191 Gif Sur Yvette, France

[3] Tsinghua Univ, Dept Engn Phys, Beijing 10084, Peoples R China

[4] Univ Paris 11, Lab Accelerateur Lineaire, F-91898 Orsay, France

来源：

JOURNAL OF INSTRUMENTATION | 2013年 / 8卷

基金：

欧洲研究理事会;

关键词：

Time projection Chambers (TPC); Micropattern gaseous detectors (MSGC; GEM; THGEM; RETHGEM; MHSP; MICROPIC; MICROMEGAS; InGrid; etc); GASEOUS DETECTOR; READOUT;

D O I：

10.1088/1748-0221/8/01/P01012

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

In this work we present a systematic study of Micromegas detectors in high pressure gaseous Xenon using trimethylamine (TMA) as quencher gas. Gas gains and energy resolutions for 22.1 keV X-rays are measured for pressures between 1 and 10 bar and various relative concentrations of TMA from 0.3 % to 15 %. We observe stable operation at all pressures, and a strongly enhanced gas gain, suggestive of Penning-like energy-transfer processes. The effect is present at all pressures and it is strongest at TMA concentrations ranging from 1.5 % to 3 %. Operating in this concentration range, the maximum gain reached values as high as similar to 2 x 10(3) (similar to 5 x 10(2)) at 1 (10) bar. Besides, the energy resolution achievable for 22 : 1 keV X-rays is substantially better than the one previously obtained in pure Xe, going down to 7.3 % (9.6 %) FWHM for 1 (10) bar. These results are of interest for calorimetric applications of high pressure gas Xe TPCs, in particular for the search of the neutrinoless double beta decay of Xe-136. The resolutions achieved would extrapolate into 0.7 % (0.9 %) FWHM at the Q(beta beta) value of Xe-136 for 1 (10) bar.

引用

页数：17

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