Liquid Hole Multipliers: bubble-assisted electroluminescence in liquid xenon

Arazi, L.; Erdal, E.; Coimbra, A. E. C.; Rappaport, Michael; Vartsky, D.; Chepel, V.; Breskin, A.

doi:10.1088/1748-0221/10/08/p08015

Cited by 21 publications

(46 citation statements)

References 39 publications

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“…It should be emphasized that NBrS electroluminescence has a universal character: it should be present in all noble gases, including He, Ne, Kr, Ar and Xe. That is why we assume that NBrS electroluminescence is present in S2 signals of two-phase Xe detectors [5,6,7,12], including those of Liquid Hole Multiplier [64]. Presumably it has not been yet observed due to the fact that the S2 signal in Xe is recorded directly using PMTs with quartz windows (i.e.…”

Section: Discussion and Possible Applications Of Nbrs Electroluminescmentioning

confidence: 99%

Revealing neutral bremsstrahlung in two-phase argon electroluminescence

Shemyakina

Bondar

Dolgov

et al. 2018

Astroparticle Physics

164

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Proportional electroluminescence (EL) in noble gases has long been used in two-phase detectors for dark matter search, to record ionization signals induced by particle scattering in the noble-gas liquid (S2 signals). Until recently, it was believed that proportional electroluminescence was fully due to VUV emission of noble gas excimers produced in atomic collisions with excited atoms, the latter being in turn produced by drifting electrons. In this work we consider an additional mechanism of proportional electroluminescence, namely that of bremsstrahlung of drifting electrons scattered on neutral atoms (so-called neutral bremsstrahlung); it is systemically studied here both theoretically and experimentally. In particular, the absolute EL yield has for the first time been measured in pure gaseous argon in the two-phase mode, using a dedicated two-phase detector with EL gap optically read out by cryogenic PMTs and SiPMs. We show that the neutral bremsstrahlung effect can explain two intriguing observations in EL radiation: that of the substantial contribution of the non-VUV spectral component, extending from the UV to NIR, and that of the photon emission at lower electric fields, below the Ar excitation threshold. Possible applications of neutral bremsstrahlung effect in two-phase dark matter detectors are discussed.

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Section: Discussion and Possible Applications Of Nbrs Electroluminescmentioning

confidence: 99%

Revealing neutral bremsstrahlung in two-phase argon electroluminescence

Shemyakina

Bondar

Dolgov

et al. 2018

Astroparticle Physics

164

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“…They named this device 'bubble-assisted liquid hole multiplier (LHM)'. Although a realistic concept (involving auxiliary heat sources) exists towards the implementation of this technique in liquid TPCs [447], this step has not been taken yet.…”

Section: Charge Multiplication In the Liquidmentioning

confidence: 99%

Gaseous and dual-phase time projection chambers for imaging rare processes

González-Díaz

Monrabal

Murphy

2018

Nuclear Instruments and Methods in Physics Research Section A:

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“…The concept of Liquid Hole-Multipliers (LHMs) was proposed [1] for the combined detection of ionization electrons and primary scintillation photons generated along charged-particle tracks in noble liquids [2][3][4][5][6][7]. The original goal was to deploy LHM units within a single-phase noble liquid TPC, aiming at simplifying the structure and thus overcoming potential technological issues that may occur in large-volume dual-phase TPC detectors.…”

Section: Introductionmentioning

confidence: 99%

First demonstration of a bubble-assisted Liquid Hole Multiplier operation in liquid argon

et al. 2019

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We demonstrate, for the first time, the operation of a bubble-assisted Liquid Hole Multiplier (LHM) in liquid argon. The LHM, sensitive to both radiation-induced ionization electrons and primary scintillation photons, consists of a perforated electrode immersed in the noble liquid, with a stable gasbubble trapped underneath. Electrons deposited in the liquid or scintillation-induced photoelectrons emitted from a photocathode on the electrode's surface, are collected into the holes; after crossing the liquid-gas interface, they induce electroluminescence within the bubble. After having validated in previous works the LHM concept in liquid xenon, we provide here first preliminary results on its operation in liquid argon. We demonstrate the bubble containment under a Thick Gas Electron Multiplier (THGEM) electrode and provide the detector response to alpha particles, recorded with SiPMs and with a PMT -under electroluminescence and with modest gas multiplication; the imaging capability is also demonstrated.

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Liquid Hole Multipliers: bubble-assisted electroluminescence in liquid xenon

Cited by 21 publications

References 39 publications

Revealing neutral bremsstrahlung in two-phase argon electroluminescence

Revealing neutral bremsstrahlung in two-phase argon electroluminescence

Gaseous and dual-phase time projection chambers for imaging rare processes

First demonstration of a bubble-assisted Liquid Hole Multiplier operation in liquid argon

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