Stability of second harmonic minority heating in magnetic mirror systems |
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| Authors: | Chandu Venugopal P J Kurian G Renuka |
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| Institution: | (1) School of Pure and Applied Physics, Mahatma Gandhi University, Cheruvandoor Campus, 686 631 Ettumannur, Kottayam, India;(2) Department of Physics, University of Kerala, 695 581 Kariavattom, Trivandrum, India |
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| Abstract: | A dispersion relation has been derived to study the stability of ion cyclotron (IC) propagation at the second harmonic of
the minority component deuterium in a mirror confined plasma that has hydrogen as the majority species. We have worked in
the frame of the majority ions; our dispersion relation can thus be used to study IC propagation in a single ion plasma also.
Analysis of the dispersion relation yields two modes — one below and the other above the ion gyro-frequency ΘH of hydrogen. The expression for the growth rate is used to explicitly show that an instability can arise in the plasma when
the loss-cone indexj⩾3; this instability being a result of the coalescing of the two modes supported by the plasma. Unfortunately, the minority
component deuterium does not decrease this instability and thus the proposed scheme of IC heating at the second harmonic of
the minority component seems unsuited to mirror devices. |
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| Keywords: | Ion cyclotron waves two-ion component plasma dispersion relation stability |
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