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: ジャーナルへの寄稿記事

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.
元の言語英語
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
発行部数28
DOI
出版物ステータス出版済み - 2012

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Thomson scattering
grids
ions
lasers
electron energy
microwaves
mass flow rate
Rayleigh scattering
krypton
beam currents
erosion
electron gas
counting
energy distribution
distribution functions
ion beams
gratings
spectrometers
saturation
nitrogen

これを引用

Thomson Scattering Diagnostics in the Plasma of an Ion Thruster. / Yamamoto, Naoji; Hiraoka, Yoshiaki; Sugita, Kensaku; Kurita, Tomoaki; Tomita, Kentaro; Uchino, Kiichiro; Nakashima, Hideki.

:: TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN, 巻 10, 番号 28, 2012, p. Pb_79-Pb_83.

研究成果: ジャーナルへの寄稿記事

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title = "Thomson Scattering Diagnostics in the Plasma of an Ion Thruster",
abstract = "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)×1017m-3 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.",
author = "Naoji Yamamoto and Yoshiaki Hiraoka and Kensaku Sugita and Tomoaki Kurita and Kentaro Tomita and Kiichiro Uchino and Hideki Nakashima",
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TY - JOUR

T1 - Thomson Scattering Diagnostics in the Plasma of an Ion Thruster

AU - Yamamoto, Naoji

AU - Hiraoka, Yoshiaki

AU - Sugita, Kensaku

AU - Kurita, Tomoaki

AU - Tomita, Kentaro

AU - Uchino, Kiichiro

AU - Nakashima, Hideki

PY - 2012

Y1 - 2012

N2 - 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)×1017m-3 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.

AB - 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)×1017m-3 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.

U2 - 10.2322/tastj.10.Pb_79

DO - 10.2322/tastj.10.Pb_79

M3 - Article

VL - 10

SP - Pb_79-Pb_83

JO - TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN

JF - TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN

SN - 1884-0485

IS - 28

ER -