The ALEXIS device is a magnetized linear plasma column. The plasma column is approximately 60 cm long. Four solenoid electromagnets confine the plasma. Each magnet is constructed from 500 feet of #10 gauge wire. The peak magnetic field in ALEXIS is approximately 150 Gauss.
Helium and argon plasmas are produced in ALEXIS using a biased tungsten filament that is heated into thermionic emission.
Photographs:
Impact of a +60 V bias voltage (applied using a 1 second square wave pulse) on the plasma.
a) Before pulse
b) During pulse
c) Immediately after pulse
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