Millimeter-wave phase-imaging interferometer for the GAMMA 10 tandem mirror

Hattori, K.; Mase, A.; Itakura, A.; Inutake, M.; Miyoshi, S.; Uehara, K.; Yonekura, T.; Nishimura, H.; Miyashita, K.; Mizuno, K.
December 1991
Review of Scientific Instruments;Dec1991, Vol. 62 Issue 12, p2857
Academic Journal
A millimeter-wave phase-imaging interferometer has been developed for the study of density profiles of the GAMMA 10 tandem mirror. The interferometer uses a 70-GHz klystron oscillator and a quasi-optical transmission system. The probe beam is expanded so as to fill an orthogonal view of a plasma cross section. The view is imaged onto a detector array. The detector array consists of beam-lead GaAs Schottky barrier diodes bonded to antennas fabricated using photolithographic techniques on a fused-quartz substrate. Two types of antennas, bow-tie and Yagi-Uda antennas have been used in order to provide an effective matching to millimeter-wave beams, and compared for the performance of an imaging system. The interferometers have been applied to the central-cell and plug-cell plasmas of GAMMA 10.


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