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Advanced electric propulsion research - 1990An experimental study of impingement current collection on the accelerator grid of an ion thruster is presented. The equipment, instruments, and procedures being used to conduct the study are discussed. The contribution to this current due to charge-exchange ions produced close to the grid is determined using a volume-integration procedure and measured ion beam current design, computed neutral atom density and measured beam plasma potential data. This current, which is expected to be almost equal to that measured directly, is found to be an order of magnitude less. The impingement current determined by integrating the current density of ambient ions in the beam plasma close to the grid is found to agree with the directly measured impingement current. Possible reasons for the disagreement between the directly measured and volume integrated impingement currents are discussed.
Document ID
19910015857
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Monheiser, Jeffery M. (Colorado State Univ. Fort Collins, CO, United States)
Wilbur, Paul J. (Colorado State Univ. Fort Collins, CO, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1991
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
NASA-CR-187103
NAS 1.26:187103
Accession Number
91N25171
Funding Number(s)
CONTRACT_GRANT: NGR-06-002-112
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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