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Hollow cathode conditioning and discharge initiation
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Image of FIG. 1.
FIG. 1.

(a) hollow cathode schematic; (b) hollow cathode installed in the vacuum chamber.

Image of FIG. 2.
FIG. 2.

Schematic of the cathode test facility.

Image of FIG. 3.
FIG. 3.

Hollow cathode conditioning: heater current and voltage vs time.

Image of FIG. 4.
FIG. 4.

Hollow cathode conditioning: orifice plate temperature vs time.

Image of FIG. 5.
FIG. 5.

Desorption of gases during conditioning.

Image of FIG. 6.
FIG. 6.

Evolution of current-voltage characteristics of hollow cathode during activation process; heater current: (a) 6 A, (b) 7 A, and (c) 7.5 A.

Image of FIG. 7.
FIG. 7.

Current-voltage characteristic of hollow cathode during activation process at a given time, heater current level, and temperature.

Image of FIG. 8.
FIG. 8.

Temperature of hollow cathode orifice plate during activation process.

Image of FIG. 9.
FIG. 9.

Effective work function and cathode temperature vs time heater current: (a) 6 A, (b) 7 A, and (c) 7.5 A.

Image of FIG. 10.
FIG. 10.

Current density vs voltage of hollow cathode at different temperatures.

Image of FIG. 11.
FIG. 11.

Effective work function at cathode orifice plate vs temperature: solid diamond, calculated from the low-voltage part of current-voltage curve ; open circle, from full range .

Image of FIG. 12.
FIG. 12.

Results of cathode activation tests: (a) ignition with gas flow delayed and (b) ignition under continuous gas flow.

Image of FIG. 13.
FIG. 13.

Model best fit to experimental emission current.


Generic image for table
Table I.

Heater current, voltage, and power values,


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hollow cathode conditioning and discharge initiation