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arXiv 1104.0916physics.plasm-ph
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电子回旋加速器和欧姆加热放电的Turbulence特性

Turbulence characteristics of electron cyclotron and ohmic heated discharges

Istvan Pusztai, Sara Moradi, Tunde Fulop, Natalia Timchenko

摘要:

利用GYRO静电回旋动力学模拟分析了电子回旋加速器(EC)和欧姆加热(OH)放电的湍流特性[J. Candy,R.E. Waltz,Journal of计算物理186,545-581(2003)],旨在发现辅助加热对传输的影响的见解。被困电子模式被发现是不稳定的OH和EC加热的情况下。在OH的情况下,主要驱动力来自密度梯度,而在EC的情况下,主要驱动力来自电子温度梯度。在这两种情况下的电子-离子温度比的增长率和粒子通量表现出定性不同的缩放。这主要是因为主导驱动力和碰撞性不同。杂质的向内流动速度和杂质扩散系数降低时,施加EC加热,这导致较低的杂质峰,与实验观察一致。

英文摘要:

Turbulence characteristics of electron cyclotron (EC) and ohmic heated (OH) discharges has been analyzed by electrostatic gyrokinetic simulations with GYRO [J. Candy, R.E. Waltz, Journal of Computational Physics 186, 545-581 (2003)] aiming to find insights into the effect of auxiliary heating on the transport. Trapped electron modes are found to be unstable in both OH and the EC heated scenarios. In the OH case the main drive is from the density gradient and in the EC case from the electron temperature gradient. The growth rates and particle fluxes exhibit qualitatively different scaling with the electron-to-ion temperature ratios in the two cases. This is mainly due to the fact that the dominant drives and the collisionalities are different. The inward flow velocity of impurities and the impurity diffusion coefficient decreases when applying EC heating, which leads to lower impurity peaking, consistently with experimental observations.

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