On the high gain operation of low-pressure microdot gas avalanche chambers

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• 作者：Breskin ; A. ; Chechik ; R. ; Garty ; G. ; Pansky ; A. ; Shefer ; E. ; Biagi ; S.F.
• 关键词：29.40.Cs ; 51.50 + V ; Gaseous radiation detectors ; Microdot detectors ; Two-stage avalanche ; Single Electron detectors
• 刊名：Nuclear Instruments and Methods in Physics Research Section A ; Accelerators ; Spectrometers ; Detectors and Associated Equipment
• 出版年：1997
• 期刊代码：41_01689002
• 类别：ph
• 出版时间：July 11, 1997
• 卷：394
• 期：1-2
• 页码：21-26
• 文件大小：473 K

摘要

Microdot avalanche chambers (MDOT) equipped with thin semitransparent Cr photocathodes, were characterized with UV photons at low gas pressure. Gains superior to 10⁴ were reached with gas multiplication at the dots. In a mode where preamplification in the gas volume precedes the additional dot multiplication, gains superior to 10⁶ were measured at 30-60 torr of propane. The fast amplification mechanism results in narrow high amplitude pulses with 2-3 ns rise time, visible with no further electronic amplification means. We present here our preliminary results and briefly discuss potential applications.