Plasma Properties in a Miniature Microwave Discharge Ion Thruster

Toru Ezaki, Naoji Yamamoto, Teppei Tsuru, Yusuke Kotani, Hideki Nakashima, Naoto Yamasaki, Kentaro Tomita, Kiichiro Uchino

Research output: Contribution to journalArticle

Abstract

In order to improve the thrust performance of a 1-mN-class miniature microwave discharge ion thruster, we investigate the dependence of inner plasma properties inside the thruster on operational conditions, krypton mass flow rate, incident microwave power and magnet field strength by laser Thomson scattering (LTS) technique. With an increase in mass flow rate, the electron temperature decreases and the electron number density increases at an incident microwave power of 16 W and the number of magnets of twelve. These results indicate that there is an optimum mass flow rate, which is 0.6 sccm in this condition. The electron number density and temperature increase with incident microwave power and is saturated at 8 W for a mass flow rate of 0.4 sccm and the number of magnets of twelve. With an increase in magnetic field strength, the electron temperature and the electron density suddenly jump from 9.8×10<sup>17</sup> m<sup>-3</sup> and 5.2 eV to 1.7×10<sup>18</sup> m<sup>-3</sup> and 7.3 eV at the number of magnets of thirteen at a mass flow rate of 0.4 sccm and incident microwave power of 16 W.
Original languageEnglish
Pages (from-to)Pb_55-Pb_59
JournalTRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN
Volume8
Issue number27
DOIs
Publication statusPublished - 2010

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mass flow rate
microwaves
magnets
ions
field strength
electron energy
Thomson scattering
krypton
thrust
electrons
magnetic fields
lasers
temperature

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Plasma Properties in a Miniature Microwave Discharge Ion Thruster. / Ezaki, Toru; Yamamoto, Naoji; Tsuru, Teppei; Kotani, Yusuke; Nakashima, Hideki; Yamasaki, Naoto; Tomita, Kentaro; Uchino, Kiichiro.

In: TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, SPACE TECHNOLOGY JAPAN, Vol. 8, No. 27, 2010, p. Pb_55-Pb_59.

Research output: Contribution to journalArticle

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abstract = "In order to improve the thrust performance of a 1-mN-class miniature microwave discharge ion thruster, we investigate the dependence of inner plasma properties inside the thruster on operational conditions, krypton mass flow rate, incident microwave power and magnet field strength by laser Thomson scattering (LTS) technique. With an increase in mass flow rate, the electron temperature decreases and the electron number density increases at an incident microwave power of 16 W and the number of magnets of twelve. These results indicate that there is an optimum mass flow rate, which is 0.6 sccm in this condition. The electron number density and temperature increase with incident microwave power and is saturated at 8 W for a mass flow rate of 0.4 sccm and the number of magnets of twelve. With an increase in magnetic field strength, the electron temperature and the electron density suddenly jump from 9.8×1017 m-3 and 5.2 eV to 1.7×1018 m-3 and 7.3 eV at the number of magnets of thirteen at a mass flow rate of 0.4 sccm and incident microwave power of 16 W.",
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AU - Ezaki, Toru

AU - Yamamoto, Naoji

AU - Tsuru, Teppei

AU - Kotani, Yusuke

AU - Nakashima, Hideki

AU - Yamasaki, Naoto

AU - Tomita, Kentaro

AU - Uchino, Kiichiro

PY - 2010

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N2 - In order to improve the thrust performance of a 1-mN-class miniature microwave discharge ion thruster, we investigate the dependence of inner plasma properties inside the thruster on operational conditions, krypton mass flow rate, incident microwave power and magnet field strength by laser Thomson scattering (LTS) technique. With an increase in mass flow rate, the electron temperature decreases and the electron number density increases at an incident microwave power of 16 W and the number of magnets of twelve. These results indicate that there is an optimum mass flow rate, which is 0.6 sccm in this condition. The electron number density and temperature increase with incident microwave power and is saturated at 8 W for a mass flow rate of 0.4 sccm and the number of magnets of twelve. With an increase in magnetic field strength, the electron temperature and the electron density suddenly jump from 9.8×1017 m-3 and 5.2 eV to 1.7×1018 m-3 and 7.3 eV at the number of magnets of thirteen at a mass flow rate of 0.4 sccm and incident microwave power of 16 W.

AB - In order to improve the thrust performance of a 1-mN-class miniature microwave discharge ion thruster, we investigate the dependence of inner plasma properties inside the thruster on operational conditions, krypton mass flow rate, incident microwave power and magnet field strength by laser Thomson scattering (LTS) technique. With an increase in mass flow rate, the electron temperature decreases and the electron number density increases at an incident microwave power of 16 W and the number of magnets of twelve. These results indicate that there is an optimum mass flow rate, which is 0.6 sccm in this condition. The electron number density and temperature increase with incident microwave power and is saturated at 8 W for a mass flow rate of 0.4 sccm and the number of magnets of twelve. With an increase in magnetic field strength, the electron temperature and the electron density suddenly jump from 9.8×1017 m-3 and 5.2 eV to 1.7×1018 m-3 and 7.3 eV at the number of magnets of thirteen at a mass flow rate of 0.4 sccm and incident microwave power of 16 W.

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