Further studies of proportional electroluminescence in two-phase argon

Bondar, A.; Dolgov, A.D.; Frolov, E.; Nosov, V. V.; Oleynikov, V.; Shemyakina, E.; Sokolov, A.

doi:10.1088/1748-0221/12/05/c05016

Cited by 8 publications

(20 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…number. In the previous method, described elsewhere [8], the PMT and SiPM p.e. numbers were determined dividing the signal pulse area by that of the single-electron pulse.…”

Section: Resultsmentioning

confidence: 99%

Neutral bremsstrahlung in two-phase argon electroluminescence: further studies and possible applications

Bondar

Dolgov

Frolov

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

Self Cite

View full text Add to dashboard Cite

We further study the effect of neutral bremsstrahlung (NBrS) in two-phase argon electroluminescence (EL), revealed recently in [1]. The absolute EL yield due to NBrS effect, in the visible and NIR range, was remeasured in pure gaseous argon in the two-phase mode, using a two-phase detector with EL gap read out directly by cryogenic PMTs and SiPMs. Possible applications of the NBrS effect in detection science are discussed, including those in two-phase dark matter detectors.

show abstract

“…number. In the previous method, described elsewhere [8], the PMT and SiPM p.e. numbers were determined dividing the signal pulse area by that of the single-electron pulse.…”

Section: Resultsmentioning

confidence: 99%

Neutral bremsstrahlung in two-phase argon electroluminescence: further studies and possible applications

Bondar

Dolgov

Frolov

et al. 2020

Nuclear Instruments and Methods in Physics Research Section A:

Self Cite

View full text Add to dashboard Cite

show abstract

“…The setup included a two-phase detector with EL gap, filled with 2.5 liters of liquid Ar. In contrast to previous measurements where Ar was doped with N 2 [16,17,18], in this work we used pure Ar. Argon, of an initial purity of 99.9998%, was used on a closed loop; it was purified from electronegative impurities by Oxisorb filter each time during the cooling procedure, providing electron life-time in the liquid >100 µs [17].…”

Section: Experimental Setup and Proceduresmentioning

confidence: 99%

Revealing neutral bremsstrahlung in two-phase argon electroluminescence

Shemyakina

Bondar

Dolgov

et al. 2018

Astroparticle Physics

Self Cite

164

View full text Add to dashboard Cite

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.

show abstract

“…In addition, the escape lines due to Y and the continuum due to scattered radiation were observed: their total contribution is shown in green dotted line. Since the energy resolution of YAP:Ce detector is worse compared to that of HPGe detector, the softer Cd lines have merged, as well as those of W. Figure 4 shows the 109 Cd emission spectrum measured using a two-phase argon detector with electroluminescence gap described elsewhere [5,6]. The energy resolution of the two-phase detector was somewhat worse than that of YAP:Ce.…”

Section: Measurements With Yap:ce Scintillator Detectormentioning

confidence: 99%

“…The main purpose of this work is to provide reference data on the emission spectrum of a 109 Cd gamma-ray source. Such a radioactive source is used to calibrate the energy scale of a two-phase argon detector, which is being developed in our laboratory for dark matter search and low-energy neutrino experiments [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of a 109Cd γ-Ray Source for the Two-Phase Argon Detector

et al. 2019

View full text Add to dashboard Cite

A: At present, a two-phase argon detector is being developed in our laboratory for dark matter search and low-energy neutrino experiments. To calibrate its energy scale a 109 Cd gammaray source was used. In this work a detailed emission spectrum of the 109 Cd source was measured using YAP:Ce scintillator and high-purity germanium (HPGe) detectors. It is shown that the 109 Cd source, equipped with a W substrate and a Cu filter, can provide a complete set of gamma-ray lines, ranging from 8 to 90 keV, for the energy calibration of two-phase detectors. These measurements allowed us to successfully quantify the shape of the amplitude spectra observed in the two-phase argon detector when irradiated with the 109 Cd source.

show abstract

Further studies of proportional electroluminescence in two-phase argon

Cited by 8 publications

References 25 publications

Neutral bremsstrahlung in two-phase argon electroluminescence: further studies and possible applications

Neutral bremsstrahlung in two-phase argon electroluminescence: further studies and possible applications

Revealing neutral bremsstrahlung in two-phase argon electroluminescence

Characterization of a 109Cd γ-Ray Source for the Two-Phase Argon Detector

Contact Info

Product

Resources

About