In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 36, No. 11R ( 1997-11-01), p. 6978-
Abstract:
Axial structures of the Alfvén ion cyclotron (AIC) mode have been investigated in the GAMMA10 tandem mirror. The AIC mode is a microinstability driven by an anisotropy in the velocity space, and is excited as an axial eigenmode in the GAMMA10. There are several discrete peaks in the frequency range of ω/Ω ci ∼0.8–0.9, where Ω ci is the ion cyclotron frequency at the midplane of the central cell. A driving term of the AIC mode is theoretically given by β ⊥ ( T ⊥ / T // ) 2 . Here, β ⊥ is a perpendicular beta value and T ⊥ / T // is a temperature anisotropy (an ion temperature ratio between perpendicular and parallel to the magnetic field line). In GAMMA10, the AIC mode is observed in the range of β ⊥ ( T ⊥ / T // ) 2 ≥0.3 (which is much smaller than the theoretical prediction of β ⊥ ( T ⊥ / T // ) 2 ≥3.52). This is thought to be related to the wave structure in the axial direction. The frequency ω and axial wave number k // of each mode changed with β ⊥ and T ⊥ / T // . As β ⊥ and T ⊥ / T // increased, the AIC frequency range became wide and the AIC wave changed from a propagating wave to a standing wave.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.36.6978
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
1997
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
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