Direct observation of bubble-assisted electroluminescence in liquid xeno

被引：21
作者：
Erdal, E. [1 ]
Arazi, L. [1 ]
Chepe, V. [2 ]
Rappaport, M. L. [1 ]
Vartsky, D. [1 ]
Breskin, A. [1 ]
机构：
[1] Weizmann Inst Sci, Dept Particle Phys & Astrophys, IL-7610001 Rehovot, Israel
[2] Univ Coimbra, Dept Phys, P-3004516 Coimbra, Portugal
来源：
JOURNAL OF INSTRUMENTATION | 2015年 / 10卷
基金：
以色列科学基金会;
关键词：
Charge transport; multiplication and electroluminescence in rare gases and liquids; Noble liquid detectors (scintillation; ionization; double-phase); Micropattern gaseous detectors (MSGC; GEM; THGEM; RETHGEM; MHSP; MICROPIC; MICROMEGAS; InGrid; etc);
D O I：
10.1088/1748-0221/10/11/P11002
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
Bubble formation in liquid xenon underneath a Thick Gaseous Electron Multiplier (THGEM) electrode immersed in liquid xenon was observed with a CCD camera. With voltage across the THGEM, the appearance of bubbles was correlated with that of electroluminescence signals induced by ionization electrons from alpha-particle tracks. This confirms recent indirect evidence that the observed photons are due to electroluminescence within a xenon vapor layer trapped under the electrode. The bubbles seem to emerge spontaneously due to heat flow from 300 K into the liquid, or in a controlled manner by locally boiling the liquid with resistive wires. Controlled bubble formation resulted in energy resolution of sigma/E approximate to 7.5% for similar to 6000 ionization electrons. The phenomenon could pave ways towards the conception of large-volume 'local dual-phase' noble-liquid TPCs.
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页数：12
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