Two distinct components of the delayed single electron noise in liquid xenon emission detectors

被引：40

作者：

Sorensen, P. ^{[1
]}

Kamdin, K. ^{[1
,2
]}

机构：

[1] Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Dept Phys, 366 LeConte Hall,MC 7300, Berkeley, CA 94720 USA

来源：

JOURNAL OF INSTRUMENTATION | 2018年 / 13卷

关键词：

Dark Matter detectors (WIMPs; axions; etc.); Noble liquid detectors (scintillation; ionization; double-phase); Time projection Chambers (TPC);

D O I：

10.1088/1748-0221/13/02/P02032

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Single electron noise which persists for many milliseconds is known to follow ionizing events in liquid/gas xenon emission detectors. Due to the long timescale, this noise can be mistaken for a genuine signal. Therefore, it is a limiting background to the low-energy threshold of dark matter searches, and could prevent discovery-class searches for MeV scale hidden sector dark matter. A systematic study reveals distinct fast and slow components to the noise. The fast component is compatible with the hypothesis of electrons which were trapped below the liquid surface, and can be reduced by increasing the electric field across the liquid/gas interface. However, the slow component increases linearly with electric field. Hypotheses for the origin of this effect are discussed, and techniques for mitigation are suggested.

引用

页数：10

共 31 条

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