Development of very-thick transparent GEMs with wavelength-shifting capability for noble element TPCs

Kuźniak, M.; González-Díaz, D.; Amedo, P.; Azevedo, C. D. R.; Fernández-Posada, D. J.; Kuźwa, M.; Leardini, S.; Leonhardt, A.; Łęcki, T.; Manzanillas, L.; Muenstermann, D.; Nieradka, G.; de Oliveira, R.; Pollmann, T. R.; Hernández, A. Saá; Sworobowicz, T.; Türkoğlu, C.; Williams, S.

doi:10.48550/arxiv.2106.03773

Cited by 1 publication

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“…Although such high voltage values are clearly challenging for most amplification structures, operation of verythick (0.5-cm) PMMA-structures machined following micropattern gas detector (MPGD) fabrication techniques has been demonstrated that can hold up to 13.5 kV in Xe at 10 bar [41], i.e., at 50-times less density than LXe. This means that, on the one hand, obtaining yields of around 200's of ph/e − as those needed to reconstruct lowenergy events (for low-mass WIMP searches, for instance [101]) would require MPGD-structures to be tailored to enhance light-collection efficiency [102], as well as further thickened in order to increase the yields. On the other hand, concerning detection of high-energy events in experiments resorting to calorimetry (such as for ββ0ν searches [93]) a direct use of the conventional formula for EL (e.g., [41]) leads to an estimate of the instrumental contribution to the energy resolution of:…”

Section: Next-mentioning

confidence: 99%

Neutral Bremsstrahlung emission in xenon unveiled

Henriques,

Amedo,

Teixeira

et al. 2022

Preprint

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We present evidence of non-excimer-based secondary scintillation in gaseous xenon, obtained using both the NEXT-White TPC and a dedicated setup. Detailed comparison with first-principle calculations allows us to assign this scintillation mechanism to neutral bremsstrahlung (NBrS), a process that has been postulated to exist in xenon that has been largely overlooked. For photon emission below 1000 nm, the NBrS yield increases from about 10 −2 photon/e − cm −1 bar −1 at pressure-reduced electric field values of 50 V cm −1 bar −1 to above 3×10 −1 photon/e − cm −1 bar −1 at 500 V cm −1 bar −1 . Above 1.5 kV cm −1 bar −1 , values that are typically employed for electroluminescence, it is estimated that NBrS is present with an intensity around 1 photon/e − cm −1 bar −1 , which is about two orders of magnitude lower than conventional, excimer-based electroluminescence. Despite being fainter than its excimeric counterpart, our calculations reveal that NBrS causes luminous backgrounds that can interfere, in either gas or liquid phase, with the ability to distinguish and/or to precisely measure low primary-scintillation signals (S1). In particular, we show this to be the case in the "buffer" and "veto" regions, where keeping the electric field below the electroluminescence (EL) threshold will not suffice to extinguish secondary scintillation. The electric field in these regions should be chosen carefully to avoid intolerable levels of NBrS emission. Furthermore, we show that this new source of light emission opens up a viable path towards obtaining S2 signals for discrimination purposes in future single-phase liquid TPCs for neutrino and dark matter physics, with estimated yields up to 20-50 photons/e − cm −1 .

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