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arXiv · 1509.02354

Direct observation of bubble-assisted electroluminescence in liquid xenon

E. Erdal·L. Arazi·V. Chepel·M. L. Rappaport·D. Vartsky·A. Breskin
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Abstract

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 300K into the liquid, or in a controlled manner, by locally boiling the liquid with resistive wires. Controlled bubble formation resulted in energy resolution of σ/E~7.5% for ~6,000 ionization electrons. The phenomenon could pave ways towards the conception of large-volume 'local dual-phase' noble-liquid TPCs.

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E. Erdal, L. Arazi, V. Chepel, M. L. Rappaport, D. Vartsky, A. Breskin. 2015-09-08. Direct observation of bubble-assisted electroluminescence in liquid xenon. https://arxiv.org/abs/1509.02354

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