Thursday 10
E. Low Pressure Plasmas and Applications
Chair: P. Brault, M. Mikikian - Each talk is 10'+2' duration
› 12:15 - 12:30 (15min)
› Blaise
The snapshot of nanosecond development of high power microwave vacuum window breakdown
Chao Chang  1, 2@  , M Zhu  1  , C.h. Chen  1  , M.n. Guo  1  , J.c. Peng  1  , S Li  1  , Z.f. Xiong  2, 1  
1 : Science and Technology on High power microwave Laboratory, Northwest Institution of Nuclear Technology  (NINT)
Xi'an City, Shaanxi Province, China,710024 -  China
2 : Department of Engineering Physics, Tsinghua University
Beijing 100084 -  China

Breakdown at the vacuum/dielectric interface is triggered by multipactor and finally realized by plasma avalanche in the ambient desorbed or evaporated gas layer above the dielectric. We have theoretically and experimentally demonstrated that the periodic surface profiles and external resonant magnetic field can prominently increase the high power microwave (HPM) breakdown thresholds.

The recent experiments of diagnosing the snapshot of nanosecond development of vacuum window breakdown are reported in this paper. For a flat-surface window, the light emission from the local plasma is focused in a thin layer above the surface during the HPM pulse, and the light emission lasts much longer than the HPM pulse, the thickness increases and the light weakens. The periodic surface could effectively suppress multipactor demonstrated by a much weaker light emission compared with flat surface.


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