High harmonic fast waves in high beta plasmas
High harmonic fast waves in high beta plasmas
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DOI：
10.1063/1.871030
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发表时间：
1995-04
影响因子：
2.2
通讯作者：
M. Ono
中科院分区：
文献类型：
--
作者：
M. Ono
研究了高β等离子体中的高次谐波快磁声波。在高贝塔区域，群速度的降低和磁泵浦的高贝塔增强的结合导致了如此大的电子吸收值，以至于人们可以预期强烈的(≊100%)单程吸收。特别是，通过控制波谱，局域电子加热和电流驱动的前景在高贝塔-低长宽比托卡马克区域似乎是可行的。有限拉莫尔半径项的加入揭示了在高离子β区(对于氢等离子体，βI≊为50%)由于模转换为离子-伯恩斯坦波模而存在的可及极限。预计电子不会受到类似的贝塔限制。随着离子β的增加，离子衰减可以显著增加，特别是在模式转换可及性极限附近。在强中性束注入和α加热过程中，预期的高能离子成分的存在似乎不会改变可及条件，也不会引起兴奋。
High harmonic fast magnetosonic waves in high beta plasmas are investigated. In the high beta regime, a combination of reduced group velocity and a high beta enhancement of magnetic pumping lead to such large values of electron absorption that one can expect strong (≊100%) single pass absorption. In particular, by controlling the wave spectrum, the prospect of localized electron heating and current drive appears to be feasible in high beta low‐aspect‐ratio tokamak regimes. Inclusion of finite‐Larmor‐radius terms reveals an accessibility limit in the high ion beta regime (βi≊50% for a deuterium plasma) due to mode conversion into an ion‐Bernstein‐wave‐like mode. No similar beta limit is expected for electrons. With increasing ion beta, the ion damping can increase significantly, particularly near the mode‐conversion accessibility limit. The presence of an energetic ion component expected during intense neutral beam injection and α heating does not appear to modify the accessibility condition nor cause exce...