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Analysis of Recent Agile Mirror Data
NAVAL RESEARCH LAB WASHINGTON DC
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Recent data taken with the agile mirror hollow cathode setup using a crossatron driven pulser show that acceptable reflected X-band microwave signals can be obtained under a narrow range of experimental parameters. The 15-cm x 25- cm x 1-cm planar discharge in 150 mTorr of air yields quite reproducible results in the presence of an axial magnetic field of approximately 100 Gauss. The discharge tends to turn off around 150 microseconds, but if the voltage is left on, the discharge restrikes after approximately 0.5 ms. The turn-off is not observed at higher pressure, but the reflected microwave signals show time variations at these pressures. It is believed that the dimensions of the present hollow cathode are not optimal. A cathode with an adjustable cavity is being built to investigate the scaling of the cathode dimensions with pressure and magnetic field for the full size 50-cm x 50-cm agile mirror experiment. There are some indications that, particularly at the lower pressures, the discharge column is beam dominated. Agile mirror, Data, Analysis
APPROVED FOR PUBLIC RELEASE