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Author(s):
M. Iwase, K. Ohkubo, S. Kubo and H. Idei
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Title:
Band Rejection Filter for Measurement of Electron Cyclotron Emission during Electron Cyclotron Heating
Date of publication:
May 1996
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Key words:
electron cyclotron emission, electron cyclotron heating, cavity, band rejection filter, Tschebysheff
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Abstract:
For the measurement of electron cyclotron emission from the high temperature plasma, a band rejection filter in the range of 40~60 GHz is designed to reject the 53.2 GHz Signal with large amplitude from the gyrotron for the purpose of plasma electron heating. The filter developed with ten sets of three quarters-wavelength coupled by TE_111 mode of tunable resonant cavity has rejection of 50 dB and 3 dB bandwidth of 500 MHz. The modified model of Tschebysheff type for the prediction of rejection is proposed. It is confirmed that the measured rejection as a function of frequency agrees well with the experimental results for small coupling hole, and also clarified that the rejection ratio increases for the large coupling hole.
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