On the mechanism of Townsend avalanche for negative molecular ions

被引：9

作者：

Dion, M. P. ^{[1
]}

Martoff, C. J. ^{[1
]}

Hosack, M. ^{[1
]}

机构：

[1] Temple Univ, Dept Phys, Philadelphia, PA 19122 USA

来源：

ASTROPARTICLE PHYSICS | 2010年 / 33卷 / 04期

基金：

美国国家科学基金会;

关键词：

Dark Matter; Negative ion; X-ray polarimeter; Diffusion; Negative ion avalanche; PROPORTIONAL-COUNTER GAS; MIXTURES; DETECTOR; CHAMBER;

D O I：

10.1016/j.astropartphys.2010.02.002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Time projection chambers drifting negative ions (NITPC) instead of electrons have several advantages. A NITPC can operate at very high reduced drift fields without diffusion runaway, and the readout digitization sampling rate requirement is considerably relaxed due to the low drift speed of negative ions. The initiation of Townsend avalanches to allow gas gain in these devices has not been understood until now. It is shown here that the avalanche in low pressure CS(2) vapor is most likely initiated by collisional detachment of the electron from the negative molecular ion. In mixtures of nitromethane vapor with CO(2) the mechanism appears to be more complex. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：216 / 220

页数：5

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