Effect of residual gas on cathode photoelectric emission life in generation III L-L-L tube

Jiangtao Xu; Xiaojun Yang; Chang Chen; Ke Xu; Beibei Liu; Min Li; Hongli Shi

doi:10.1117/12.2087260

13 April 2015 Effect of residual gas on cathode photoelectric emission life in generation III L-L-L tube

Jiangtao Xu, Xiaojun Yang, Chang Chen, Ke Xu, Beibei Liu, Min Li, Hongli Shi

Proceedings Volume 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II; 952203 (2015) https://doi.org/10.1117/12.2087260
Event: Selected Proceedings of the Photoelectronic Technology Committee Conferences held August-October 2014, 2014, China, China

Abstract

In order to solve the sensitivity’s degression in the GaAs NEA photocathode, our crew dissected the Gen. III Low-Light-Level（L-L-L）tube and analyzed the residual gas from the tub e while functionally operating via mass spectrometer. The photoemission-harmful gas like C，CO，CO2 were the principal reason cause the photocathode sensitivity to drop most. Applying the theory of dipole layer, this paper had this thorough discussion over the impact the residual pernicious gas had upon the photocathode. The residual gas on the emission layer enlarged the interface barrier and dwindled the chance of overflow about the same time.There were none photoemission when the single molecule gas were all over the emission layer, and so the life-span has came to an end as well. Our crew bring forward “carbon-contamination precaution measure” on account of lo wering potential barrier, which resolve problems like unstable photocathode sensitivity and limited life-span.

Citation Download Citation

Jiangtao Xu, Xiaojun Yang, Chang Chen, Ke Xu, Beibei Liu, Min Li, and Hongli Shi "Effect of residual gas on cathode photoelectric emission life in generation III L-L-L tube", Proc. SPIE 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II, 952203 (13 April 2015); https://doi.org/10.1117/12.2087260

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KEYWORDS

Carbon dioxide

Carbon monoxide

Gallium arsenide

Interfaces

Microchannel plates

Absorption

Gases

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