Effects of local toroidal field ripples due to test blanket modules for ITER on radial transport of thermal ions
Effects of local toroidal field ripples due to test blanket modules for ITER on radial transport of thermal ions
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DOI：
10.1088/0029-5515/52/11/114013
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发表时间：
2012-11
期刊：
影响因子：
3.3
通讯作者：
N. Oyama;H. Urano;K. Shinohara;M. Honda;T. Takizuka;N. Hayashi;Y. Kamada
中科院分区：
文献类型：
--
作者：
N. Oyama;H. Urano;K. Shinohara;M. Honda;T. Takizuka;N. Hayashi;Y. Kamada
利用蒙特卡罗（F3D-OFMC）编码的全三维磁场轨道，研究了ITER测试包层模块（tbm）中使用的铁磁性钢对位于基座顶部附近的热离子径向输运的局部环面场（TF）波纹的影响。在模拟中，分布在基座顶部附近（ΨN = 0.91）的2万个测试粒子的三维运动轨迹与该位置的热离子具有相同的麦克斯韦速度分布，运动时间为1.9 s。与没有TBM的情况下的粒子损失数量相比，ITER中预期的三个TBM端口的额外损失被评估为小于测试粒子的1%。附加损耗随TBM端口数和局部TF纹波幅度的平方成线性增加。对无铁素体插入和有18个TBM端口的TF纹波的极向结构进行了比较。研究发现，如果极向纹波结构不相同，在某一点纹波幅值相同的情况下，附加损失率会有很大的不同。香蕉尖附近的波纹振幅似乎是决定热离子径向扩散的最重要因素。
The effects of local toroidal field (TF) ripples due to ferromagnetic steels used in test blanket modules (TBMs) in ITER on the radial transport of thermal ions located near the top of the pedestal are investigated using a fully three-dimensional magnetic field orbit following Monte Carlo (F3D-OFMC) code. In the simulation, the three-dimensional motion of 20 000 test particles, distributed near the top of the pedestal (ΨN = 0.91) with the same Maxwellian velocity distribution as the thermal ions at this location, is traced for 1.9 s. In comparison with the number of lost particles in the case without a TBM, the additional loss with three TBM ports expected in ITER is evaluated to be less than 1% of the test particles. The additional losses increase linearly with the number of TBM ports and with the square of the amplitude of the local TF ripple. The poloidal structure of the TF ripple without ferritic inserts and a case with 18 TBM ports are also compared. It is found that cases having the same ripple amplitude at a certain point can have substantially different additional loss rates if the poloidal ripple structure is not the same. The ripple amplitude near the banana tip seems to be the most important factor in determining the radial diffusion of thermal ions.