観測ロケットS 520-25 号機搭載用ベアテザーを用いたプラズマ収集実験(2007/2008年度宇宙関連プラズマ研究会講演集)

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The primary objectives of the sounding rocket experiment, S-520-25, are to deploy an electro-conductive bare tape tether in space and to study the electron current-collection by the tape tether when biased positively. Before the space experiment, we have carried out laboratory experiments on the plasma collection by the tape tether in a large space science chamber at ISAS/JAXA. This paper presents the major results on the currentvoltage characteristics of the tape tether in the plasma environment which simulates the ionospheric plasma It was found that the tether current approached to the prediction by the Orbit Motion Limit (OML) theory as the tether voltage was increased up to 500 V. In the high voltage region more than 200 V, we often observed the discharge at the surface of the tether that damaged the tether material.