Control of the radial electric field shear by modification of the magnetic field configuration in LHD
Control of the radial electric field shear by modification of the magnetic field configuration in LHD
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DOI：
10.1088/0029-5515/45/5/010
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发表时间：
2005-04
期刊：
影响因子：
3.3
通讯作者：
K. Ida;M. Yoshinuma;M. Yokoyama;S. Inagaki;N. Tamura;B. Peterson;T. Morisaki;S. Masuzaki;A. Komori;Y. Nagayama;K. Tanaka;K. Narihara;K. Watanabe;C. Beidler
中科院分区：
文献类型：
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作者：
K. Ida;M. Yoshinuma;M. Yokoyama;S. Inagaki;N. Tamura;B. Peterson;T. Morisaki;S. Masuzaki;A. Komori;Y. Nagayama;K. Tanaka;K. Narihara;K. Watanabe;C. Beidler
对径向电场的控制在螺旋等离子体中被认为是重要的，因为径向电场和它的剪切被期望分别减少新古典和异常输运。一般来说，可以通过改变对撞度来控制径向电场，通过减小或增加电子密度分别获得正电场或负电场。虽然可以通过改变对撞性来控制径向电场的符号，但要实现对径向电场的进一步控制，特别是要产生强大的径向电场剪切，则需要对磁场进行修改。在大螺旋装置（LHD）中，径向电场分布是由磁场的改变来控制的：(1)改变有效螺旋波纹的径向分布，εh,(2)用外部扰动场线圈产生磁岛，(3)改变局部岛分流线圈电流。
Control of the radial electric field, Er, is considered to be important in helical plasmas, because the radial electric field and its shear are expected to reduce neoclassical and anomalous transport, respectively. In general, the radial electric field can be controlled by changing the collisionality, and positive or negative electric fields have been obtained by decreasing or increasing the electron density, respectively. Although the sign of the radial electric field can be controlled by changing the collisionality, modification of the magnetic field is required to achieve further control of the radial electric field, especially to produce a strong radial electric field shear. In the Large Helical Device (LHD) the radial electric field profiles are shown to be controlled by the modification of the magnetic field by (1) changing the radial profile of the effective helical ripples, εh, (2) creating a magnetic island with an external perturbation field coil and (3) changing the local island divertor coil current.