Electrostatic ion cyclotron instability near threshold
作者:
R. McWilliams,
M. K. Okubo,
N. S. Wolf,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1986)
卷期:
Volume 29,
issue 9
页码: 3031-3035
ISSN:0031-9171
年代: 1986
DOI:10.1063/1.865464
出版商: AIP
数据来源: AIP
摘要:
By drawing an electron current through a plasma to a variably biased conducting button, the electrostatic ion cyclotron instability is excited, consistent with predictions of Drummond and Rosenbluth [Phys. Fluids5, 1507 (1962)]. Recent results show that a nonuniform steady‐state electric field reaches axially into the plasma. Our results indicate that electrons are accelerated along magnetic field lines and decelerated by collisions. The point in space where the electron drift speed exceeds a critical speed (vc∼0.2vte) determines the instability amplitude and frequency. This initiation point moved further into the plasma as the externally controlled electric field was raised. This experiment demonstrates the importance of applying biases so thate&fgr;/T≲1, near threshold, to observe the linear electrostatic ion cyclotron instability.
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