The influences of vacuum pressure and gas components on the stability of GaAs photocathode

Long Wang; Feng Shi; Hongchang Cheng; Sen Niu; Hongli Shi; Lei Yan; Xing Cheng; Yuan Yuan

doi:10.1117/12.2178709

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13 April 2015 The influences of vacuum pressure and gas components on the stability of GaAs photocathode

Long Wang, Feng Shi, Hongchang Cheng, Sen Niu, Hongli Shi, Lei Yan, Xing Cheng, Yuan Yuan

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Proceedings Volume 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II; 95220I (2015) https://doi.org/10.1117/12.2178709
Event: Selected Proceedings of the Photoelectronic Technology Committee Conferences held August-October 2014, 2014, China, China

Abstract

The photocurrent attenuation of GaAs photocathode within one hour after activation under three different vacuum pressure (5×10^-9Pa, 5×10^-8Pa, 5×10^-7Pa) were recorded by automatically activated monitor. The results show that: the photocurrent quickly descend in the beginning and then descend linearly at a low slope; the amplitude of the quickly descending area were 10%, 14.74% and 36%separately, with the respective slope of the linear descending area were -0.00653, -0.01132and -0.02. Three samples’ gas components of H₂, CH₄, CO, H₂O, O₂, CO₂ etc under the same vacuum pressure (5×10^-8Pa)during photocurrent attenuation were collected by quadrupole mass spectrometer. By comparing the gas components content and the attenuation law of the photocurrent, it has been found that H₂O and H₂ had a greater impact on the stability of GaAs photocathode in the ultra-high vacuum environment and H₂O was the predominant effect. This paper has important guiding significance and reference value in studying the stability of GaAs photocathode and the improvement of semiconductor photocathode process.

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Long Wang, Feng Shi, Hongchang Cheng, Sen Niu, Hongli Shi, Lei Yan, Xing Cheng, and Yuan Yuan "The influences of vacuum pressure and gas components on the stability of GaAs photocathode", Proc. SPIE 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II, 95220I (13 April 2015); https://doi.org/10.1117/12.2178709

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