研究NSTX中Alfvénic模式分叉的可能性和预测ITER基线情景
Study of the likelihood of Alfvénic mode bifurcation in NSTX and predictions for ITER baseline scenarios
摘要：
在NSTX中发现了固定频率和啁啾相位之间的罕见Alfvénic波跃迁，通常观察到Alfvénic波表现出啁啾或雪崩响应。对于这些跃迁，我们应用一个标准[Duarte et al，Nucl.Fusion 57，054001（2017）]来预测托卡马克中快速离子再分布的性质处于对流或扩散非线性状态。对于NSTX放电中的过渡是不伴随着在束沉积功率或修改注入的射频功率的变化，它已被发现，异常的快速离子传输是固定频率模式的行为和快速啁啾之间的分叉可能的调解人。为了定量评估，使用GTS代码进行了静电离子温度梯度湍流和捕获电子模式湍流对啁啾的影响的全局陀螺动力学模拟。调查扩展的Alfvénic本征模式的基线ITER的情况下，包括榆树，先进的和混合的情况下，通过可能的光谱行为的预测研究。已经观察到，大多数模式被发现是稳定和啁啾相位之间的边界。
英文摘要：
Rare Alfvénic wave transitions between fixed-frequency and chirping phases are identified in NSTX, where Alfvénic waves are normally observed to exhibit either chirping or avalanching responses. For those transitions, we apply a criterion [Duarte et al, Nucl. Fusion 57, 054001 (2017)] to predict the nature of fast ion redistribution in tokamaks to be in the convective or diffusive nonlinear regimes. For NSTX discharges in which the transition is not accompanied by changes in the beam deposited power or modifications in the injected radiofrequency power, it has been found that the anomalous fast ion transport is a likely mediator of the bifurcation between the fixed-frequency mode behavior and rapid chirping. For a quantitative assessment, global gyrokinetic simulations of the effects of electrostatic ion temperature gradient turbulence and trapped electron mode turbulence on chirping were pursued using the GTS code. The investigation is extended by means of predictive studies of the probable spectral behavior of Alfvénic eigenmodes for baseline ITER cases consisting of elmy, advanced and hybrid scenarios. It has been observed that most modes are found to be borderline between the steady and the chirping phases.
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