Accession Number:

ADA533434

Title:

Laser-Induced Fluorescence Velocity Measurements of a Diverging Cusped Field Thruster

Descriptive Note:

Technical rept.

Corporate Author:

STANFORD UNIV CA PLASMA PHYSICS LAB

Report Date:

2010-11-15

Pagination or Media Count:

15.0

Abstract:

Measurements are presented of the most probable time-averaged ion velocities within the acceleration channel and in the plume of a diverging cusped field thruster operating on xenon. Xenon ion velocities for the thruster are derived from laser-induced fluorescence measurements of the 5d472- 6p352 xenon ion excited state transition centered at 834.72 nm. The thruster is operated in both a high current mode, where the anode discharge current is shown to oscillate periodically, and a low current mode where operation is relatively quiescent. In the low current mode, ion emission is predominantly in the form of a conical jet, whereas in the high current mode, the emission is still divergent but more diffuse througout the cone angle. The diffuse plume may be related to the oscillatory nature of the high current mode, where the regions of ionization and ion acceleration may oscillate between the second and third outer cusps in the channel.

Subject Categories:

  • Radiation and Nuclear Chemistry
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE