Operation of a Hollow Cathode Neutralizer for Sub-100-W Hall and Ion Thrusters

We explore the operation of the Rafael heaterless hollow cathode (RHHC) at low discharge current levels corresponding to sub-100-W Hall and ion thrusters operation. We present experimental results of the cathode operating at discharge current levels of 0.2–0.5 A and mass flow rates of 0.2 and 0.25 mg/s. For each operational condition, potential measurements near the cathode region, in the cathode plume, and on the anode were conducted. We show that the cathode may operate in a self-sustained mode at discharge current levels down to 0.35 A. We show that the cathode coupling potential increases as the discharge current is decreased and may reach values of 40 V at the lowest discharge current. Accordingly, the cathode coupling power is estimated to account for up to 14 W of the anode power supply power. We show that when the RHHC cathode is coupled with a hypothetical very low-power Hall thruster, the estimated cathode power intake would be 10%–23% of the overall thruster power. Finally, using external cathode body temperature measurements, we assess the radiated power from the cathode surface to be lower than 1 W. Overall, we demonstrate that the RHHC cathode is suitable for operation with very low-power Hall and ion thrusters for discharge power under 100 W.

[1]  Kristina M. Lemmer,et al.  Propulsion for CubeSats , 2017 .

[2]  Samudra E. Haque,et al.  Electric propulsion for small satellites , 2014 .

[3]  Jacob Herscovitz Electric Propulsion Developments at Rafael , 2015 .

[4]  L. Garrigues,et al.  Hollow cathode modeling: a first approach on scaling laws , 2015 .

[5]  M. Cappelli,et al.  Experimental Characterization of a Micro-Hall Thruster , 2007 .

[6]  Dan M. Goebel,et al.  Plasma Potential Behavior and Plume Mode Transitions in Hollow Cathode Discharges , 2007 .

[7]  W. Hargus,et al.  Experimental and Numerical Examination of the BHT-200 Hall Thruster Plume , 2007 .

[8]  Yevgeny Raitses,et al.  Cathode effects in cylindrical Hall thrusters , 2008 .

[9]  Stéphane Pellerin,et al.  UKRAINIAN SPT-20 HALL EFFECT THRUSTER: ANALYSIS OF THE PLUME BY OPTICAL EMISSION SPECTROSCOPY , 2008 .

[10]  Richard E. Wirz,et al.  Hollow Cathode and Low-Thrust Extraction Grid Analysis for a Miniature Ion Thruster , 2008 .

[11]  D. Knapp Implementation of a ¼ Inch Hollow Cathode into a Miniature Xenon Ion Thruster (MiXI) , 2012 .

[12]  Dan M. Goebel,et al.  Effects of an Internally-Mounted Cathode on Hall Thruster Plume Properties , 2006 .

[13]  Jason D. Sommerville,et al.  Hall-effect thruster--Cathode coupling: The effect of cathode position and magnetic field topology , 2009 .

[14]  Leonid Appel,et al.  Development of a Low Current Heaterless Hollow Cathode for Hall Thrusters , 2015 .

[15]  Dan R. Lev,et al.  The Development of CAM200 - Low Power Hall Thruster , 2016 .

[16]  R LevDan,et al.  The Rise of the Electric Age for Satellite Propulsion , 2017 .

[17]  V. Lappas,et al.  Micro-electric propulsion (EP) solutions for small satellite missions , 2011, 2011 2nd International Conference on Space Technology.

[18]  Dan M. Goebel,et al.  Cathode Coupling in Hall Thrusters , 2007 .

[19]  V. Gurovich,et al.  Characterization of a Heaterless Hollow Cathode , 2013 .

[20]  Richard E. Wirz,et al.  Discharge plasma processes of ring-cusp ion thrusters , 2005 .

[21]  G. Alon,et al.  Low current heaterless hollow cathode neutralizer for plasma propulsion-Development overview. , 2019, The Review of scientific instruments.

[22]  I. Katz,et al.  Insert Heating and Ignition in Inert-Gas Hollow Cathodes , 2008, IEEE Transactions on Plasma Science.

[23]  I. Katz,et al.  Fundamentals of Electric Propulsion: Ion and Hall Thrusters , 2008 .

[24]  L. B. King,et al.  Hall-Effect Thruster--Cathode Coupling, Part II: Ion Beam and Near-Field Plume , 2011 .

[25]  Yevgeny Raitses,et al.  Recommended Practice for Use of Emissive Probes in Electric Propulsion Testing , 2017 .

[26]  D. Goebel,et al.  Hall Thruster Cathode Flow Impact on Coupling Voltage and Cathode Life , 2012 .

[27]  Noah Zachary Warner,et al.  Theoretical and experimental investigation of Hall thruster miniaturization , 2007 .

[28]  Qianhong Chen,et al.  Electrical characteristics prediction of microsatellite photovoltaic subsystem in orbit , 2015, 2015 IEEE Energy Conversion Congress and Exposition (ECCE).

[29]  John M. Sankovic,et al.  Evaluation of Low Power Hall Thruster Propulsion , 1996 .

[30]  I. Katz,et al.  Hollow Cathode and Keeper-region Plasma Measurements Using Ultra-fast Miniature Scanning Probes , 2004 .

[31]  C. M. Philip,et al.  An Investigation of Physical Processes in a Hollow Cathode Discharge , 1972 .

[32]  Hiroyuki Koizumi,et al.  The technological and commercial expansion of electric propulsion , 2019, Acta Astronautica.

[33]  Stéphane Mazouffre,et al.  Electric propulsion for satellites and spacecraft: established technologies and novel approaches , 2016 .

[34]  N. Meezan,et al.  Low power, linear geometry hall plasma source with an open electron drift , 2000 .

[35]  James E. Polk,et al.  Characterization of Hollow Cathode Performance and Thermal Behavior , 2006 .

[36]  George J. Williams,et al.  Low-current hollow cathode evaluation , 1999 .

[37]  Yevgeny Raitses,et al.  Ionization, Plume Properties, and Performance of Cylindrical Hall Thrusters , 2010, IEEE Transactions on Plasma Science.