著者
田原 弘一 弓削 政郎 白崎 篤司 マルチネスサンチェス マヌエル
出版者
一般社団法人 日本航空宇宙学会
雑誌
日本航空宇宙学会論文集 = Journal of the Japan Society for Aeronautical and Space Sciences (ISSN:13446460)
巻号頁・発行日
vol.52, no.608, pp.408-415, 2004-09-05
被引用文献数
4 2

Low-power Hall thruster flowfields were calculated using a simple one-dimensional model to understand plasma characteristics and ion acceleration processes and to predict thruster performance. The influences of magnetic field strength and acceleration channel length were mainly examined. The thruster model for calculation is the THT-IV low power thruster developed in Osaka University. Generally, ions were produced in an upstream region from the anode to some axial location of the acceleration channel, and then they were intensively accelerated in a region downstream just from the ionization region. With too short channel, ionization began downstream just from the anode, and then ion acceleration also occurred in the same region, resulting in poor ion flux and low thrust performance. In large channel length, the channel was long enough to produce a fully-ionized plasma, and efficient ion production and acceleration occurred. When the magnetic field strength increased in the channel, ionization occurred in a more upstream region, and ion acceleration began in the same region; that is, ionization and acceleration overlapped in the relatively long region. On the other hand, with a weak magnetic field ion production and acceleration, intensively and efficiently, occurred in their thin regions. Furthermore, we tried to include unclear anomalous electron diffusions by changing a Bohm diffusion coefficient at each high magnetic field strength in order to fit a calculated performance to the measured one. The calculated discharge current almost equaled the measured one, and the thrust characteristic also agreed well with the measured one.
著者
田原 弘一
出版者
公益社団法人 応用物理学会
雑誌
應用物理 (ISSN:03698009)
巻号頁・発行日
vol.81, no.3, pp.196-203, 2012-03-10
参考文献数
23

<p>小惑星探査機「はやぶさ」はイオンエンジンを駆り地球帰還,世界中を興奮させた.宇宙大航海時代の幕開けである.近年,さまざまな高度宇宙ミッションの遂行・提案に合わせて,既存の電気推進ロケットエンジンの性能向上,作動域の拡大,さらに斬新なアイデアを盛り込んだ,新しい電気推進エンジンの開発研究が盛んである.高性能電気推進エンジンの開発においては,プラズマ物理・技術を駆使して,いかに効率よくプラズマを生成・加速するかが鍵となる.また,宇宙機器特有の軽量化,長寿命化も開発上の大きな問題である.本稿では,電気推進エンジンの最近の開発・利用状況,将来の月基地建造,有人火星探査計画などに適用できる大電力電気推進の必要性,微小電力電気推進エンジン搭載超小型人工衛星打ち上げ計画を紹介する.</p>