Numerical study of the resonant magnetic perturbations for Type I edge localized modes control in ITER
Numerical study of the resonant magnetic perturbations for Type I edge localized modes control in ITER
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DOI：
10.1088/0029-5515/48/2/024003
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发表时间：
2008-01
期刊：
影响因子：
3.3
通讯作者：
M. Becoulet;E. Nardon;G. Huysmans;W. Zwingmann;P. Thomas;M. Lipa;R. Moyer;T. Evans;V. Chuyanov;Y. Gribov;A. Polevoi;G. Vayakis;G. Federici;G. Saibene;A. Portone;A. Loarte;C. Doebert;C. Gimblett;J. Hastie;V. Parail
中科院分区：
文献类型：
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作者：
M. Becoulet;E. Nardon;G. Huysmans;W. Zwingmann;P. Thomas;M. Lipa;R. Moyer;T. Evans;V. Chuyanov;Y. Gribov;A. Polevoi;G. Vayakis;G. Federici;G. Saibene;A. Portone;A. Loarte;C. Doebert;C. Gimblett;J. Hastie;V. Parail
一些可能的设计的外部和容器内线圈产生共振磁扰动（RMP）的I型边缘局域模（ELMs）控制在ITER的参考方案（H-模式，混合和稳态）进行了分析，考虑到物理，技术和空间的限制。在DIII-D ELM抑制实验中，I线圈产生的随机性水平（Chirikov参数为1/2 ≤ 0.95）被用作参考。环形对称n = 3的设计被认为是为了避免较低的n数产生较大的中心岛，这是MHD不稳定性的潜在触发因素。RMP线圈设计的评估是相对于RMP频谱进行的，该RMP频谱应在最小电流下产生足够的边缘遍历和最小的中心扰动。建议的设计包括容器内，中间端口和外部线圈。在合理的范围内，由于内电感li、极向β βp和边缘磁剪切的变化而引起的平衡变化对边缘遍历性的影响很小。目前的估计是在没有裕度的情况下进行的，对于真空场，忽略了RMP上的血浆响应。使用[1]在粘阻线性响应状态下分析估计了真空方法的有效性。在DIII-D和ITER中由RMP线圈产生的典型径向磁场幅度是一个数量级或略高于“向下”分叉到重新连接阶段的临界值，这表明在基座区域中形成岛的可能性。预计将筛选中央岛屿（从基座顶部开始）。
A number of possible designs of external and in-vessel coils generating resonant magnetic perturbations (RMPs) for Type I edge localized modes (ELMs) control in ITER are analysed for the reference scenarios (H-mode, Hybrid and Steady-State) taking into account physical, technical and spatial constraints. The level of stochasticity (Chirikov parameter ∼1 at ψ1/2 ∼ 0.95) generated by the I-coils in the DIII-D experiments on ELMs suppression was taken as a reference. Designs with a toroidal symmetry n = 3 were considered to avoid lower n numbers producing larger central islands, a potential trigger of MHD instabilities. The evaluation of RMP coils designs is done with respect to the RMPs spectrum that should produce enough edge ergodisation and minimum central perturbations at minimum current. The proposed designs include in-vessel, mid-ports and external coils. Changes in the equilibrium due to changes in the internal inductance li, the poloidal beta βp and the edge magnetic shear in a reasonable range for ITER scenarios were demonstrated to have a small effect on the edge ergodisation. Present estimations were done without margins and for vacuum fields neglecting plasma response on RMPs. The validity of the vacuum approach was estimated analytically in the visco-resistive linear response regime using [1]. The typical radial magnetic field amplitudes produced by RMP coils in DIII-D and ITER are an order of magnitude or slightly above the critical values for the ‘downward’ bifurcation to the reconnected stage indicating the possibility of the islands formation in the pedestal region. Central islands (from the top of the pedestal) are expected to be screened.