Edge resonant fluctuations and particle transport in a reversed-field pinch
Edge resonant fluctuations and particle transport in a reversed-field pinch
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反向场箍缩中的边缘共振涨落和粒子输运
DOI：
10.1063/1.873170
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发表时间：
1998
影响因子：
2.2
通讯作者：
A. Möller
中科院分区：
文献类型：
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作者：
A. Möller
使用朗缪尔探头阵列在Exp T2反场收缩中测量静电波动[J.R.Drake等人，《等离子体物理和受控核聚变研究》(国际原子能机构，维也纳，1997年)，第2卷，第193-199页]。推导了静电涨落驱动的粒子输运ΓnΦ，发现它占粒子输运总量的很大一部分。所有测量量的光谱密度在100千赫兹-250千赫兹的频率范围内表现出一个峰值，该峰值源于在边缘附近共振的波动[n=−(40-80)]。这一峰值仅包含总涨落功率的10-20%，但显示ΓnΦ占主导地位。其主要原因是与内共振磁流体力学涨落相比，环形模数较高。边缘共振涨落还具有较高的相干性(γ=0.5)，密度和势涨落之间的相移接近90°。
Electrostatic fluctuations are measured in the Extrap T2 reversed-field pinch [J. R. Drake et al., in Plasma Physics and Controlled Nuclear Fusion Research 1996 (International Atomic Energy Agency, Vienna, 1997), Vol. 2, pp. 193–199] using a Langmuir probe array. The electrostatic fluctuation, driven particle transport ΓnΦ is derived and found to constitute a large fraction of the total particle transport. The spectral density of all measured quantities exhibits a peak in the frequency range 100–250 kHz, which originates from fluctuations that are resonant close to the edge [n=−(40–80)]. This peak contains only about 10–20% of the total fluctuation power, but is shown to dominate ΓnΦ. The main reason for this is the high toroidal mode number as compared with internally resonant magnetohydrodynamic fluctuations. The edge resonant fluctuations also features a higher coherence (γ=0.5) and close to 90° phase shift between density and potential fluctuations.