ELECTRIC-FIELD EFFECTS ON THE QUANTUM EFFICIENCY OF CSI PHOTOCATHODES IN GAS MEDIA

被引：26

作者：

BRESKIN, A

BUZULUTSKOV, A

CHECHIK, R

VARTSKY, D

MALAMUD, G

MINE, P

机构：

[1] WEIZMANN INST SCI,DEPT PARTICLE PHYS,IL-76100 REHOVOT,ISRAEL

[2] ECOLE POLYTECH,IN2P3,LPNHE,CNRS,F-91128 PALAISEAU,FRANCE

[3] SOREQ NUCL RES CTR,IL-70600 YAVNE,ISRAEL

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 1994年 / 344卷 / 03期

关键词：

D O I：

10.1016/0168-9002(94)90874-5

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We have measured the quantum efficiency (QE) of CsI photocathodes as a function of the electric field strength in a parallel-plate geometry, in CH4, C2H6 and i-C4H10 both in charge collection and multiplication modes. It was found that in the collection plateau the QE value in gases is lower compared to that of vacuum and is independent of the field; in gas media the QE starts to increase at the transition between collection and multiplication modes and reaches the vacuum value at high gas gain. We explain this effect by a decrease of the electron-molecule elastic backscattering while entering the multiplication mode. We conclude that the electric field effects observed here, would also apply for other photocathodes and gas mixtures. An enhancement of the QE after microdischarges was observed and is discussed in detail.

引用

收藏

页码：537 / 546

页数：10

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