Study of bialkali photocathodes below room temperature in the UV/VUV region
Study of bialkali photocathodes below room temperature in the UV/VUV region
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室温以下UV/VUV区域双碱光电阴极的研究
DOI：
10.1109/23.682445
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发表时间：
1998
影响因子：
1.8
通讯作者：
A. Policarpo
中科院分区：
文献类型：
--
作者：
H. Araújo;V. Chepel;M. Lopes;J. V. D. Marel;R. Marques;A. Policarpo
本文研究了两种带有双碱光电阴极和熔融石英窗口的光电倍增管（2”Philips XP 2020 Q和1-1/8”Hamamatsu R1668）在室温和-160/spl deg/C之间，在UV/VUV波长范围内以直流模式照明。光电倍增管作为二极管工作，直接测量光电子的电流，以研究与光阴极相关的效应。研究了光照强度、外加电压和光照面积对温度响应的影响。发射层的电阻率在冷却后的增加被证明是负责的光电阴极响应的线性损失，最终导致在低温下完全没有信号。一个简化的模型，占一些实验结果。在170 nm处还发现低于室温的响应意外增加。
Two photomultiplier tubes with bialkali photocathodes and fused silica windows (2" Philips XP2020Q and 1-1/8" Hamamatsu R1668) were studied between room temperature and -160/spl deg/C, illuminated in dc mode in the UV/VUV wavelength range. The photomultipliers were operated as diodes, with direct measurement of the current of photoelectrons, order to study the effects associated to the photocathode. The influence of light intensity, applied voltage and illuminated area on the response as a function of temperature were investigated. The increase of the electrical resistivity of the emissive layer upon cooling proved to be responsible for a loss of linearity of the photocathode response, leading ultimately to the complete absence of signal at low temperature. A simplified model is presented that accounts for some experimental results. An unexpected increase of response below room temperature was also found at 170 nm.