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首页> 外文期刊>Plasma physics and controlled fusion >Blob dynamics in TORPEX poloidal null configurations
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Blob dynamics in TORPEX poloidal null configurations

机译:TORPEX极性无效配置中的Blob动力学

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摘要

3D blob dynamics are simulated in X-point magnetic configurations in the TORPEX device via a non-field-aligned coordinate system, using an isothermal model which evolves density, vorticity, parallel velocity and parallel current density. By modifying the parallel gradient operator to include perpendicular perturbations from poloidal field coils, numerical singularities associated with field aligned coordinates are avoided. A comparison with a previously developed analytical model (Avino 2016 Phys. Rev. Lett. 116 105001) is performed and an agreement is found with minimal modification. Experimental comparison determines that the null region can cause an acceleration of filaments due to increasing connection length, but this acceleration is small relative to other effects, which we quantify. Experimental measurements (Avino 2016 Phys. Rev. Lett. 116 105001) are reproduced, and the dominant acceleration mechanism is identified as that of a developing dipole in a moving background. Contributions from increasing connection length close to the null point are a small correction.
机译:使用等温模型,通过演化密度,涡度,平行速度和平行电流密度,通过非场对准坐标系,在TORPEX装置中以X点磁性配置模拟3D斑点动力学。通过修改平行梯度算子以包括来自极场线圈的垂直扰动,避免了与场对准坐标相关的数字奇异点。进行了与先前开发的分析模型(Avino 2016 Phys。Rev. Lett。116 105001)的比较,并找到了修改最少的协议。实验比较确定,由于连接长度增加,空区域可能导致细丝加速,但是相对于我们量化的其他效果而言,这种加速很小。再现了实验测量值(Avino 2016 Phys。Rev. Lett。116 105001),并且主要的加速机制被确定为运动背景中正在发展的偶极子的加速机制。接近零点的连接长度增加所带来的贡献是很小的修正。

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