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Discharge at the pillbox window for an LHRF launcher

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3 Author(s)
Ikeda, Y. ; Naka Fusion Res. Establ., JAERI, Ibaraki, Japan ; Imai, Tsuyoshi ; Sakamoto, K.

The discharge at a pillowbox-type waveguide vacuum window for a lower hybrid resonant frequency (LHRF) launcher at 2 GHz is studied experimentally. A discharge is observed near the window at a pressure below 10-2 Pa. The discharge has little or no effect on the RF-transmission waveform; however, the temperature rise of the ceramic due to the discharge reaches about 100 times higher than that in the no-discharge case. Moreover, the breakdown of gas in the waveguide is enhanced by the discharge. The discharge can be suppressed by sufficient RF conditioning and/or by coating the window with materials having a low secondary electron emission ratio such as carbon or TiN. These results are accurately explained by the theory of single-surface multipactoring discharge induced by an electric field perpendicular to the ceramic and the space charge

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Plasma Science, IEEE Transactions on  (Volume:17 ,  Issue: 3 )