Electron Recoil rejection by decay time measurement in large liquid Xenon detectors

Namwongsa, Parinya; Banjongkan, Anupong; Chen, X.; Giboni, Karl; Ji, Xiangdong; Kobdaj, C.; Kusano, Hiroki; Yan, Yupeng

doi:10.1088/1748-0221/12/04/p04019

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…As now customary, the side walls of the detector are covered with polytetrafluoroethylene (PTFE or Teflon) reflectors [12]. We thus forego the use of pulse shape discrimination (PSD) which appears promising in simulation [13], but would require to avoid all reflections and cover the side walls with very fast PMTs. The impact of PSD in LXe as a background…”

Section: Measurement Principlementioning

confidence: 99%

On the electrode configurations in a large single phase liquid xenon detector for dark matter searches

Juyal

Giboni

et al. 2021

J. Inst.

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In the near future there will be the request for very large liquid Xenon (LXe) detectors for Dark Matter (DM) searches in the 50-ton range. To avoid an impractically long, single drift space of a dual-phase detector, it seems beneficial to use the single-phase technique. Since electrons then can drift in any direction, we can segment the homogeneous medium and thus avoid an excessive maximum drift path of order 4 m. The shorter detector length has several benefits, e.g. requiring a lower cathode voltage for the same drift field. We can easily split the TPC into two regions with the cathode in the center and two anodes at the top and bottom. One also can use multiple TPCs stacked on top of each other in the same liquid volume to reduce the maximum drift length even further.A further division of the drift space by installing an additional anode in the center would require S2 photons to traverse the liquid for several times the Rayleigh scattering length in LXe, which is only 30-40 cm. This seems to be excessive for good x-y localization. We therefore suggest a geometry of two independent TPCs with two drift spaces each.Despite earlier publications concerns persisted about the effect of shadowing. A detailed FEM model of the anode regions shows that with an aligned wire arrangement the drifting electrons impinge sideways on the anode in a narrow angular range of width 15 • -20 • . Most S2 photons are emitted in full view of the close-by PMT array. About 37% of the S2 photons are shadowed by the anode wire out of which 30% will be reflected back again on the gold plating of the wires. Thus we can observe 74% of the total S2 light. Compared to a dual-phase detector, however, we do not suffer from the extraction efficiency, sometimes reported as low as 50%. K: Charge transport, multiplication and electroluminescence in rare gases and liquids; Detector modelling and simulations II (electric fields, charge transport, multiplication and induction, pulse formation, electron emission, etc); Liquid detectors; Time projection Chambers (TPC)

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Section: Measurement Principlementioning

confidence: 99%

On the electrode configurations in a large single phase liquid xenon detector for dark matter searches

Juyal

Giboni

et al. 2021

J. Inst.

Self Cite

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show abstract

Section: Measurement Principlementioning

confidence: 99%

On the Electrode Configurations in a Large Single Phase Liquid Xenon Detector for Dark Matter Searches

Juyal,

Giboni,

et al. 2021

Preprint

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In the near future there will be the request for very large liquid Xenon (LXe) detectors for Dark Matter (DM) searches in the 50-ton range. To avoid an impractically long, single drift space of a dual-phase detector, it seems beneficial to use the single-phase technique. Since electrons then can drift in any direction, we can segment the homogeneous medium and thus avoid an excessive maximum drift path of order 4 m. The shorter detector length has several benefits, e.g. requiring a lower cathode voltage for the same drift field. We can easily split the TPC into two regions with the cathode in the center and two anodes at the top and bottom. One also can use multiple TPCs stacked on top of each other in the same liquid volume to reduce the maximum drift length even further.A further division of the drift space by installing an additional anode in the center would require S2 photons to traverse the liquid for several times the Rayleigh scattering length in LXe, which is only 30 -40 cm. This seems to be excessive for good x -y localization. We therefore suggest a geometry of two independent TPCs with two drift spaces each.Despite earlier publications concerns persisted about the effect of shadowing. A detailed FEM model of the anode regions shows that with an aligned wire arrangement the drifting electrons impinge sideways on the anode in a narrow angular range of width 15 • -20 • . Most S2 photons are emitted in full view of the close-by PMT array. About 37% of the S2 photons are shadowed by the anode wire out of which 30% will be reflected back again on the gold plating of the wires. Thus we can observe 74% of the total S2 light. Compared to a dual-phase detector, however, we do not suffer from the extraction efficiency, sometimes reported as low as 50%. K: Liquid Detectors, Time projection Chambers (TPC), Charge transport, multiplication and electroluminescence in rare gases and liquids, Detector modelling and simulations II (electric fields, charge transport, multiplication and induction, pulse formation, electron emission, etc)

show abstract

Electron Recoil rejection by decay time measurement in large liquid Xenon detectors

Cited by 2 publications

References 23 publications

On the electrode configurations in a large single phase liquid xenon detector for dark matter searches

On the electrode configurations in a large single phase liquid xenon detector for dark matter searches

On the Electrode Configurations in a Large Single Phase Liquid Xenon Detector for Dark Matter Searches

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