A direct-current Penning surface-plasma source

Smith, H. Vernon; Allison, Paul; Geisik, Carl; Schmitt, David R.; Schneider, J. David; Stelzer, James E.
April 1994
Review of Scientific Instruments;Apr94, Vol. 65 Issue 4, p1176
Academic Journal
After developing a pulsed 8X source for H[sup -] beams, we are now testing a cooled, dc version. The design dc power density on the cathode surface is 900 W/cm², much higher than achieved in any previously reported Penning surface-plasma source. The source is designed to accommodate dc arc power levels up to 30 kW by cooling the electrode surfaces with pressurized, hot water. After striking the arc using a 600-V pulser, a 350-V dc power supply is switched in to sustain the 100-V discharge. Now our tests are concentrating on arc pulse lengths ≤1 s. Ultimately, the discharge will be operated dc. The source is described and the initial arc test results are presented.


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