Implementation of Automatic Process of Edge Rotation Diagnostic System on J-TEXT Tokamak

Zhang, Zepin; Cheng, Zhifeng; Luo, Jian; Wang, Zhijiang; Zhang, Xiaolong; Hou, Saiying; Cheng, Cheng

doi:10.1088/1009-0630/16/8/10

Cited by 1 publication

(1 citation statement)

References 12 publications

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“…Wu et al 7) observed the shape of the longgap-distance vacuum arc of a coil-type electrode and found that with increasing gap distance, the radius of the arc column increases near the cathode but decreases near the anode. Cheng et al [8][9][10] studied the long-gap-distance vacuum arc of different electrodes, and found that arc stability is related to gap distance, arc current, as well as the intensity and phase shift of the imposed axial magnetic field. Xiu et al 3) revealed the distortion phenomenon of the long-gap-distance vacuum arc and studied the relevant factors of arc distortion.…”

Section: Introductionmentioning

confidence: 99%

Variation of plasma parameters of vacuum arc column with gap distance

Wen¹,

Yuan²,

He³

2016

Jpn. J. Appl. Phys.

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On the basis of a two-dimensional (2D) magneto-hydrodynamic model, we studied long-gap-distance vacuum arcs in a uniform axial magnetic field and determined the effect of gap distance varying in a large range on plasma parameters. Simulation results showed that with increasing gap distance, the parameters of the plasma near the cathode are almost invariant, except for ion number density, but the parameters of the plasma in front of the anode clearly vary; meanwhile, joule heat gradually becomes the main source of energy for the arc column. In a short gap, a clear current constriction can be found in the entire arc column. Whereas when the gap distance exceeds a certain value, a sharp contraction of the current only arises in front of the anode.

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