期刊
PLASMA SOURCES SCIENCE & TECHNOLOGY
卷 23, 期 4, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0963-0252/23/4/045014
关键词
magnetic nozzle; adiabatic; VASIMR; electric propulsion; helicon
资金
- University of Houston Institute for Space Systems Operations (ISSO) Postdoctoral Fellowship program
A mechanism for ambipolar ion acceleration in a magnetic nozzle is proposed. The plasma is adiabatic (i.e., does not exchange energy with its surroundings) in the diverging section of a magnetic nozzle so any energy lost by the electrons must be transferred to the ions via the electric field. Fluid theory indicates that the change in plasma potential is proportional to the change in average electron energy. These predictions were compared to measurements in the VX-200 experiment which has conditions conducive to ambipolar ion acceleration. A planar Langmuir probe was used to measure the plasma potential, electron density, and electron temperature for a range of mass flow rates and power levels. Axial profiles of those parameters were also measured, showing consistency with the adiabatic ambipolar fluid theory.
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