Preliminary analysis of back-streaming electrons on the source plasma region of ion sources for the EAST-NBI

Chundong HU (胡纯栋); Mingshan WU (吴铭钐); Yahong XIE (谢亚红); Yongjiang XU (许永建); Xiang LI (栗翔); Caichao JIANG (蒋才超)

doi:10.1088/2058-6272/aa57ee

Plasma Science and Technology > 2017 > 19(4): 45602-045602. > DOI: 10.1088/2058-6272/aa57ee

Chundong HU (胡纯栋), Mingshan WU (吴铭钐), Yahong XIE (谢亚红), Yongjiang XU (许永建), Xiang LI (栗翔), Caichao JIANG (蒋才超). Preliminary analysis of back-streaming electrons on the source plasma region of ion sources for the EAST-NBI[J]. Plasma Science and Technology, 2017, 19(4): 45602-045602. DOI: 10.1088/2058-6272/aa57ee

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Preliminary analysis of back-streaming electrons on the source plasma region of ion sources for the EAST-NBI

1 Institute of Plasma Physics, Chinese Academy of Science, Hefei 230031, People’s Republic of China 2 University of Science and Technology of China, Hefei 230026, People’s Republic of China

Funds: This work is partly supported by National Natural Science Foundation of China (No.11405207, No.11505225 and No.11675215), partly supported by the International Science and Technology Cooperation Program of China (No. 2014DFG61950) and the Sciences foundation of ASIPP (No. DSJJ-15-GC03).

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Received Date: July 21, 2016

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Abstract

Abstract

Back-streaming electrons gain significant energy due to the high voltage of the extraction system for a high-current ion source. By theoretical calculation, the particle flux accounts for 13.88% of the total beam current, and the power flux accounts for about 7.5% of the total beam power. This shows that back-streaming electrons are very destructive to the plate of electron absorption that is installed opposite of the?accelerator. At the same time, as particles impinge on grids, the energy level that the grids absorb will be really high. Compared with the water flow calorimetry data of ion sources on the ASIPP-NBI testbed, it can be found that, as the high voltage of the extraction system rises, the particle flux and the power flux of the back-streaming electrons are essentially in the same proportions. Therefore, the corresponding energy deposited on the components of the ion source will grow by the same percentage with the increase in high voltage, which demonstrates strong inhibition to improving the neutral beam power injected into a tokamak.
- EAST-NBI,
- back-streaming electrons,
- water flow calorimeter

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References (13)

References

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