Calibrating and deriving physical parameters using plasma contactor data from the international space station

In the framework of developing a fast-starting hollow cathode, one must understand how a cathode is conditioned for operation. The desorption of known contaminates as a function of heater power was measured to quantify cathode conditioning characteristics. In addition to conditioning, a study of hollow cathode emission characteristics under vacuum conditions was performed. Results of these two studies are described herein along with measurements of the temperature of the cathode as a function of time and heater power. The data are used to validate a transient surface diffusion model that describes the migration and surface coverage fraction of low-work-function material from the interior of the hollow cathode to the orifice barrel and to the exterior surface of the orifice plate of the cathode. A sufficiency condition is presented for our cathode geometry of vacuum emission current level and the ability to start a hollow cathode discharge once gas flow is initiated.

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Hollow cathode conditioning and discharge initiation

Rubin

Williams

2008

Journal of Applied Physics

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The «Obstanovka» experiment aboard the International Space Station

Климов¹,

Korepanov²

2004

Kosm. nauka tehnol.

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Calibrating and deriving physical parameters using plasma contactor data from the international space station

Cited by 2 publications

References 3 publications

Hollow cathode conditioning and discharge initiation

Hollow cathode conditioning and discharge initiation

The «Obstanovka» experiment aboard the International Space Station

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