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Hollow Cathode Assembly Development for the HERMeS Hall ThrusterTo support the operation of the HERMeS 12.5 kW Hall Thruster for NASA's Asteroid Redirect Robotic Mission, hollow cathodes using emitters based on barium oxide impregnate and lanthanum hexaboride are being evaluated through wear-testing, performance characterization, plasma modeling, and assessment of system implementation concerns. This paper will present the development approach used to assess the cathode emitter options. A 2,000-hour wear-test of development model barium-oxide-based (BaO) hollow cathode is being performed as part of the development plan. The cathode was operated with an anode that simulates the HERMeS hall thruster operating environment. Cathode discharge performance has been stable with the device accumulating 740 hours at the time of this report. Cathode operation (i.e. discharge voltage and orifice temperature) was repeatable during period variation of discharge current and flow rate. The details of the cathode assembly operation during the wear-test will be presented.
Document ID
20170001280
Document Type
Conference Paper
Authors
Sarver-Verhey, Timothy R. (NASA Glenn Research Center Cleveland, OH United States)
Kamhawi, Hani (NASA Glenn Research Center Cleveland, OH United States)
Goebel, Dan M. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Polk, James E. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Peterson, Peter Y. (Vantage Partners, LLC Cleveland, OH, United States)
Robinson, Dale A. (Vantage Partners, LLC Cleveland, OH, United States)
Date Acquired
February 3, 2017
Publication Date
July 25, 2016
Subject Category
Spacecraft Propulsion and Power
Report/Patent Number
GRC-E-DAA-TN33739
Meeting Information
AIAA/SAE/ASEE Joint Propulsion Conference(Salt Lake City, UT)
Funding Number(s)
CONTRACT_GRANT: NNC12BA01B
WBS: WBS 729200.06.03.05
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Plasma Sources/Technology
Electric Space Propulsion
Propulsion Technology

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