Feb 15 – 19, 2016
Vienna University of Technology
Europe/Vienna timezone

LHM: a new noble-liquid detector concept based on bubble-assisted electroluminescence

Feb 18, 2016, 10:15 AM
EI9 (Vienna University of Technology)


Vienna University of Technology

Gusshausstraße 27-29, 1040 Wien
Talk Gaseous Detectors Gas Detectors


Mr Eran Erdal (Weizmann Institute of Science)


We present a new noble-liquid detection concept and experimental results in LXe, based on the bubble-assisted Liquid Hole Multiplier (LHM). In this “local dual-phase detection element”, a gas bubble is supported underneath a micro-pattern electrode (THGEM, GEM etc.) immersed inside the liquid. Ionization electrons and scintillation-induced photoelectrons (PE) extracted from a CsI photocathode, drift through the electrode's holes; they induce electroluminescence (EL) in the bubble, with tens of photons emitted per drifting electron. A cascaded-LHM detector, operated through photon-mediated process in noble-liquid, would provide high light yields – detectable with internal or external photo-sensors. We will present LHM-prototype results in LXe, demonstrating the stability of the bubble-assisted concept in GEM and THGEM. Examples are: energy resolution (7.5% for ~6,000 electrons), efficient PE extraction from a CsI-coated THGEM and GEM in LXe and their collection into holes; EL photo-yields, time resolution (10ns) with scintillation photons and results of the cascaded-LHM operation will be provided. The merits of the bubble-assisted LHM concept will be discussed in the context of future applications for rare-event and other searches.

Primary authors

Amos Breskin (Weizmann Institute of Science (IL)) Dr David Vartsky (Weizmann Institute of Science) Mr Eran Erdal (Weizmann Institute of Science) Lior Arazi (Weizmann Institute of Science) Dr Michael Rappaport (Weizmann Institute of Science) Dr Vitaly Chepel (Coimbra University, Coimbra)

Presentation materials