Excitation Characteristics of Ion Waves in a Negative Ion Plasma.

• Yoshimura Shinji

  Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816

• Nakamura Yoshiharu

  Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229

• Watanabe Tsuguhiro

  National Institute for Fusion Science, Chikusaku, Nagoya 464–01

• Kawai Yoshinobu

  Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816

Bibliographic Information

Other Title

• Excitation Characteristics of Ion Waves

Abstract

Excitation and propagation of ion waves in a negative ion plasma are investigated numerically and compared with the experiments which have been performed using Q-machine and multidipole dc discharge device. The dispersion relation of the ion waves derived from conventional complex ω-plain procedure cannot explain previously observed simultaneous propagation of the fast and the slow mode. Spatial excitation coefficients of the slow mode, which are calculated from complex k /-plain procedure, are comparable to that of the fast mode. Furthermore, if there exists a plasma ion flow which decreases damping of both modes, the spatial excitation coefficients of the slow mode will increase. From this point of view, the simultaneous propagation of both modes may be possible under a certain laboratory condition. Also the direct calculation of wave potential is presented. In the region not too close to the excitation point, the principal mode which propagates in a negative ion plasma is found to be the fast mode. In the case where T_+=T_e and there is a finite ion flow, the interference pattern between the fast and the slow mode appears in the vicinity of the excitation point. Finally, we compare the results with laboratory experiments. Our numerical calculations qualitatively explain the previous observations of the slow mode.

Journal

• Journal of the Physical Society of Japan

  Journal of the Physical Society of Japan 66 (12), 3842-3846, 1997

  THE PHYSICAL SOCIETY OF JAPAN

Keywords

• negative ion plasma
• fast mode
• slow mode
• dispersion relation
• excitation coefficient

Details

• CRID: 1390001204179795456
• NII Article ID: 110001978122
• NII Article ID: 210000100563
• NII Article ID: 130004536043
• NII Book ID: AA00704814
• DOI: 10.1143/jpsj.66.3842
• BIBCODE: 1997JPSJ...66.3842Y
• ISSN: 13474073
• ISSN: 00319015
• NDL BIB ID: 4384406
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4384406
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.66.3842
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed