NASA NTRS · 20060043394
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Polk, Jay. 2004-02-01. An overview of the NEXIS Ion Thruster Development program. https://ntrs.nasa.gov/citations/20060043394
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The Hollow Cathode Assembly is a thermionic source of electrons critical to the operation of the L-3 ETI Xenon Ion Propulsion System (XIPS) thruster.
Ions with energies significantly in excess of the discharge voltage have been reported in high current hollow cathode discharges. Models of DC potential hills downstream of the cathode and ion acoustic instabilities in a double layer postulated in the cathode orifice have been proposed to explain these energetic ions, but have not been substantiated in experiments.
We will report on the test apparatus, calibrations of the system, the test procedure used and results for 13, 20 and 30-segment isolators.