Observation of unusual slow components in electroluminescence signal of two-phase argon detector

Bondar, A.; Borisova, E.; Frolov, E.; Oleynikov, V.; Sokolov, A.

doi:10.1088/1748-0221/15/06/c06064

Cited by 9 publications

(31 citation statements)

References 41 publications

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“…3. Note that at higher electric fields the electroluminescence (S2) signal had the characteristic slow component with time constant of about 5 𝜇s, similar to that observed elsewhere [39].…”

Section: Methodssupporting

confidence: 83%

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Study of visible-light emission in pure and methane-doped liquid argon

Bondar¹,

Borisova²,

Buzulutskov³

et al. 2022

Preprint

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In liquid argon TPCs for dark matter search and neutrino detection experiments, primary scintillations are used as a prompt signal of particle scattering, being intensively produced in the vacuum ultraviolet (VUV) due to excimer emission mechanism. On the other hand, there were indications on the production of visible light scintillations in liquid argon, albeit at a much lower intensity, the origin of which is still not clear. The closely related issue is visible light scintillations in liquid argon doped with methane, the interest in which is due to the possible use in neutron veto detectors for those experiments. In this work we study in detail the properties of such scintillations in pure liquid argon and its mixtures with methane. In particular, the absolute photon yield of visible light scintillations in pure liquid argon was measured to be about 200 and 90 photon/MeV for X-rays and alpha particles respectively. In liquid argon doped with methane the photon yield dropped down significantly, by about an order of magnitude at a methane content varying from 0.01 to 1%, and then almost did not change when further increasing the methane content up to 10%. There are firm indications that the mechanism of visible light scintillations in liquid argon and its mixtures with methane is that of neutral bremsstrahlung of primary ionization electrons.

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“…3. Note that at higher electric fields the electroluminescence (S2) signal had the characteristic slow component with time constant of about 5 𝜇s, similar to that observed elsewhere [39].…”

Section: Methodssupporting

confidence: 83%

“…It is seen that when increasing the CH 4 content the S2 signal became faster, its slow component quickly disappearing (see [39] for explanation of the S2 slow component). In addition, its amplitude and drift time (time difference between S1 and S2) decreased.…”

Section: Measurements With Liquid Argon Doped With Methane 41 Pulse-s...mentioning

confidence: 98%

Study of visible-light emission in pure and methane-doped liquid argon

Bondar¹,

Borisova²,

Buzulutskov³

et al. 2022

Preprint

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“…The detector included a 9 l cryogenic chamber filled with 2.5-3.5 liters of liquid Ar and operated in a two-phase mode in equilibrium state at a saturated vapor pressure of 1.00, 1.50 or 0.75 atm, corresponding to a temperature of 87.3, 91.3 or 84.7 K respectively [34]. Compared to the detector used in preliminary studies [16,17], there were only minor modifications. In particular, the detector configuration without wavelength shifter (WLS) was used, i.e.…”

Section: Methodsmentioning

confidence: 99%

“…In our preliminary work [16], it was supposed that these unusual slow components are most likely present in the charge signal itself and that metastable negative Ar ions might be responsible for their formation. In this work, we study the unusual slow components in a more elaborated way, in particular using an alpha-particle source in addition to that of gamma-ray.…”

Section: Introductionmentioning

confidence: 94%

“…In this work, we fill this gap: for the first time, the S2 time properties have been systematically studied in two-phase Ar detectors in a wide range of electric fields. The preliminary results of the study were presented in [16,17]. In those works, two unusual slow components of S2 signals in two-phase Ar detector were observed, with time constants of about 4-5 µs and 50 µs, referred to as "slow" and "long" components respectively.…”

Section: Introductionmentioning

confidence: 98%

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Puzzling time properties of proportional electroluminescence in two-phase argon detectors for dark matter searches

Buzulutskov,

Frolov,

Borisova

et al. 2022

Preprint

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Proportional electroluminescence (EL) in noble gases is the physical effect routinely used in twophase (liquid-gas) detectors for dark matter searches to record the primary ionization signal in the gas phase induced by particle scattering in the liquid phase. In this work, the time properties of visible-light EL in two-phase argon detectors have for the first time been systematically studied. In particular, two unusual slow components in the EL signal, with time constants of about 4-5 µs and 50 µs, were observed. Their puzzling property is that their contributions and time constants increase with electric field, which is not expected in any of the known mechanisms of photon and electron emission in two-phase media. In addition, a specific threshold behavior of the slow components was revealed: they emerged at a threshold in reduced electric field of about 5 Td regardless of the gas phase density, which is 1 Td above the onset of standard (excimer) EL. It is shown that this threshold is related to higher atomic excited states Ar * (3p 5 4p). An unexpected temperature dependence of slow components was also observed: their contribution decreased with temperature, practically disappearing at room temperature. We show that the puzzling properties of slow components can be explained in the framework of hypothesis that these are produced in the charge signal itself due to trapping of drifting electrons on metastable negative argon ions.Keywords two-phase detectors • liquid argon • dark matter • slow components • metastable negative argon ions

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Next frontiers in particle physics detectors: INSTR2020 summary and a look into the future

Titov¹

2020

J. Inst.

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The physics goals of high luminosity particle accelerators, from LHC to HL-LHC and to the next generation of lepton colliders, have set quite stringent constraints on the future needs at the Instrumentation Frontier. Many technologies are reaching their sensitivity limit and new approaches need to be developed to overcome the currently irreducible technological challenges. The detrimental effect of the material budget and power consumption represents a very serious concern for a high-precision silicon vertex and tracking detectors. One of the most promising areas is CMOS sensors offering low mass and potentially radiation-hard technology for the future proton-proton and electron-positron colliders, intensity frontier and heavy-ion experiments. MPGDs have become a well-established technique in the fertile field of gaseous detectors; these will remain the primary choice whenever the large-area coverage with low material budget is required. Vacuum tube technology is inherently fast and new developments include advances in microchannel plates for photomultipliers with a potential for a picosecondtime resolution in large systems. Several novel concepts of picosecond-timing detectors will have numerous powerful applications in particle identification, pile-up rejection and event reconstruction, and serve numerous scientific goals. The story of modern calorimetry is a textbook example of physics research driving the development of an experimental method. Silicon photomultipliers have seen a rapid progress in the last decade, becoming the standard solution for scintillator-based devices. The integration of advanced electronics and data transmission functionalities plays an increasingly important role and needs to be addressed. Bringing the modern algorithmic advances from the field of machine learning from offline applications to online operations and trigger systems is another major challenge. The timescales spanned by future projects in particle physics, ranging from few years to many decades, constitute a challenge in itself, in addition to the complexity and diversity of the required accelerator and detector R&D. This paper summarizes advances and recent trends in the instrumentation techniques for particle physics experiments, largely based on the presentations given at the International Conference "Instrumentation for Colliding Beam Physics" (INSTR-20), held at BINP Novosibirsk, Russia, from 24 to

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Observation of unusual slow components in electroluminescence signal of two-phase argon detector

Cited by 9 publications

References 41 publications

Study of visible-light emission in pure and methane-doped liquid argon

Study of visible-light emission in pure and methane-doped liquid argon

Puzzling time properties of proportional electroluminescence in two-phase argon detectors for dark matter searches

Next frontiers in particle physics detectors: INSTR2020 summary and a look into the future

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