Thomson Scattering Diagnostics in the Plasma of an Ion Thruster

Naoji Yamamoto, Yoshiaki Hiraoka, Kensaku Sugita, Tomoaki Kurita, Kentaro Tomita, Kiichiro Uchino, Hideki Nakashima

研究成果: Contribution to journalArticle査読

抄録

In order to validate the grid erosion evaluation code for the lifetime validation of ion thrusters, the electron number density/temperature in the vicinity of a screen gird in a 30 W class microwave discharge ion thruster were measured by means of laser Thomson scattering (LTS) technique. A photon counting method and a triple grating spectrometer were used against a small Thomson scattering signal and a strong stray laser light. Observed Thomson scattering spectrum tells that the electron energy distribution function was Maxwellian. From this spectrum and the Rayleigh scattering calibration using nitrogen gas, electron number density and electron temperature were calculated to be (3.8±0.2)×10<sup>17</sup>m<sup>-3</sup> and 6.2±0.1 eV, respectively at incident microwave power of 8 W and krypton mass flow rate of 6.2 μg/s. The ion saturation currents estimated from the LTS measurement are in good agreement with ion beam currents through the screen grid for several conditions. These results show that LTS technique is a useful non-intrusive tool for measuring plasma property in the vicinity of the screen grid.
本文言語英語
ページ(範囲)Pb_79-Pb_83
ジャーナルTRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN
10
28
DOI
出版ステータス出版済み - 2012

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