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

Abstract : 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.
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Contributor : Sabine Starita <>
Submitted on : Friday, August 9, 2013 - 11:42:54 AM
Last modification on : Wednesday, September 16, 2020 - 5:43:29 PM

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S. Cebrian, T. Dafni, E. Ferrer-Ribas, I. Giomataris, D. Gonzalez-Diaz, et al.. Micromegas-TPC operation at high pressure in xenon-trimethylamine mixtures. Journal of Instrumentation, IOP Publishing, 2013, 8, pp.P01012. ⟨10.1088/1748-0221/8/01/P01012⟩. ⟨in2p3-00850863⟩

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