Simulation studies of the role of reconnection in the “current hole” experiments in the Joint European Torus
Simulation studies of the role of reconnection in the “current hole” experiments in the Joint European Torus
复制标题
DOI：
10.1063/1.1556299
复制
发表时间：
2003-04
影响因子：
2.2
通讯作者：
J. Breslau;S. Jardin;W. Park
中科院分区：
文献类型：
--
作者：
J. Breslau;S. Jardin;W. Park
已观察到将低混合电流驱动注入到联合欧洲环(JET)放电的电流上升阶段，以产生具有基本上为零的电流密度的核心区的环形电流分布[Hawkes等，Phys。莱特牧师。87、115001(2001年)]。在日本原子能研究所托卡马克60升级放电中也观察到了类似的“电流孔”，该放电具有由自举电流提供的离轴电流驱动[T.Fujita等人，物理。莱特牧师。87、245001(2001年)]。在这两种情况下，中心电流都不会变成负值，尽管电流扩散计算表明有足够的无感电流驱动来实现这一点。这是由环形几何中的多层3D代码(M3D)非线性2D和3D电阻磁流体(MHD)模拟所解释的，该模拟预测这些放电经历n=0重联事件--“轴对称锯齿”--重新分配电流以将其核心密度保持在零附近。与传统的锯齿不同，这些..。
Injection of lower hybrid current drive into the current ramp-up phase of Joint European Torus (JET) discharges has been observed to produce an annular current distribution with a core region of essentially zero current density [Hawkes et al., Phys. Rev. Lett. 87, 115001 (2001)]. Similar “current holes” have been observed in Japan Atomic Energy Research Institute Tokamak 60 Upgrade discharges with off-axis current drive supplied by bootstrap current [T. Fujita et al., Phys. Rev. Lett. 87, 245001 (2001)]. In both cases, the central current does not go negative, although current diffusion calculations indicate that there is sufficient noninductive current drive for this to occur. This is explained by the multilevel 3D code (M3D) nonlinear 2D and 3D resistive magnetohydrodynamic (MHD) simulations in toroidal geometry, which predict that these discharges undergo n=0 reconnection events—“axisymmetric sawteeth”—that redistribute the current to hold its core density near zero. Unlike conventional sawteeth, these...