Study on Electron Emission Phenomenon of the Surface Micro Area of Coated Impregnated Dispenser Cathode

Shengyi YIN; Feng REN; Zhipeng LU; Yongqing ZHANG; Shenjin ZHANG; Feng YANG; Dong WEI; Jiao HAN; Yang LI

doi:10.11999/JEIT171000

Volume 40 Issue 10

Sep. 2018

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Article Navigation > Journal of Electronics & Information Technology > 2018 > 40(10): 2535-2540

Shengyi YIN, Feng REN, Zhipeng LU, Yongqing ZHANG, Shenjin ZHANG, Feng YANG, Dong WEI, Jiao HAN, Yang LI. Study on Electron Emission Phenomenon of the Surface Micro Area of Coated Impregnated Dispenser Cathode[J]. Journal of Electronics & Information Technology, 2018, 40(10): 2535-2540. doi: 10.11999/JEIT171000

Citation:

Shengyi YIN, Feng REN, Zhipeng LU, Yongqing ZHANG, Shenjin ZHANG, Feng YANG, Dong WEI, Jiao HAN, Yang LI. Study on Electron Emission Phenomenon of the Surface Micro Area of Coated Impregnated Dispenser Cathode[J]. Journal of Electronics & Information Technology, 2018, 40(10): 2535-2540. doi: 10.11999/JEIT171000

Citation:

Shengyi YIN, Feng REN, Zhipeng LU, Yongqing ZHANG, Shenjin ZHANG, Feng YANG, Dong WEI, Jiao HAN, Yang LI. Study on Electron Emission Phenomenon of the Surface Micro Area of Coated Impregnated Dispenser Cathode[J]. Journal of Electronics & Information Technology, 2018, 40(10): 2535-2540. doi: 10.11999/JEIT171000

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Study on Electron Emission Phenomenon of the Surface Micro Area of Coated Impregnated Dispenser Cathode

doi: 10.11999/JEIT171000

Shengyi YIN^{1
,
,},
Feng REN^{1, 2},
Zhipeng LU^{1, 2},
Yongqing ZHANG¹,
Shenjin ZHANG³,
Feng YANG³,
Dong WEI⁴,
Jiao HAN¹,
Yang LI¹

1.
Key Laboratory of High Power Microwave Sources and Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
2.
University of Chinese Academy of Sciences, Beijing 100039, China
3.
Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
4.
KYKY Technology Co., Ltd, Beijing 100190, China

Funds: The National Instrumentation Program of China (2012YQ120048)

Received Date: 2017-10-25
Rev Recd Date: 2018-06-14

Available Online: 2018-07-30

Publish Date: 2018-10-01

Abstract

Abstract

The impact on impregnated cathode electronic emission, when it is coated by films, is an important studied content in the field of thermionic cathode. A cathode sample is evenly split by impregnated dispenser cathode and coated impregnated dispenser cathode. The sample is activated at 1150 ℃ in the Deep UltraViolet laser Photo- and Thermal- Emission Electron Microscope system (DUV-PEEM/TEEM) for 2 hours. In this system, the micro- electron emission phenomenon of two cathode and its changes with temperature are compared and studied directly. The results show that the electronic emission of both impregnated cathode and coated impregnated cathode are mainly located at the pores and the edge of the adjacent particles; Along with the rise of cathode's temperature, the cathode emission without coating anything is still mainly focused on the pores and nearby narrow regions on cathode surface, that the emission area changed a little. However, for the coated impregnated dispenser cathode, the effective emission area is extended from the pores and its edge to the area far away from the pores. These results for the first time give the electron emission characteristics for impregnated cathode coated with film, which have certain reference value to understand the emission mechanism of this cathode.
- Impregnated dispenser cathode,
- Electron emission,
- Surface micro area,
- Photoemission electron microscope

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References(18)

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