Control of sawteeth and triggering of NTMs with ion cyclotron resonance frequency waves in JET
Control of sawteeth and triggering of NTMs with ion cyclotron resonance frequency waves in JET
复制标题
JET 中离子回旋共振频率波的锯齿控制和 NTM 触发
DOI：
10.1088/0029-5515/42/11/306
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发表时间：
2002
期刊：
影响因子：
3.3
通讯作者：
M. Zabiégo
中科院分区：
文献类型：
--
作者：
E. Westerhof;O. Sauter;M. Mayoral;D. Howell;M. Mantsinen;M. Nave;B. Alper;C. Angioni;P. Belo;R. Buttery;A. Gondhalekar;T. Hellsten;T. Hender;T. Johnson;P. Lamalle;M. Maraschek;K. McClements;F. Nguyen;A. Pecquet;S. Podda;J. Rapp;S. Sharapov;M. Zabiégo
提出了一种延迟或防止新古典主义撕裂模式(NTM)开始的新方案。通过主动锯齿失稳，产生了短周期和低幅度的锯齿，从而减少了产生NTM种子岛的锯齿，提高了触发NTM的归一化等离子体压力阈值--β起始值。这一设想已经在联合欧洲环(JET)中进行了实验探索。离子回旋共振频率(ICRF)波被调谐到二次谐波H-少数共振，用于锯齿控制。而ICRF波一般诱导锯齿形稳定，有利于触发NTMS并降低β的起始值，而本实验表明，通过环向波产生离子回旋电流驱动，并且锯齿形可以通过小心地定位二次谐波H共振层相对于锯齿形反转半径来失稳。其结果是，在仅通过中性束注入额外加热的情况下，NTM起始延迟，并且β起始时间增加到超过其值。
A new scenario to delay or prevent neoclassical tearing mode (NTM) onset is presented. By active sawtooth destabilization, short period and low amplitude sawteeth are generated, such that the sawtooth produced NTM seed island is reduced and the threshold normalized plasma pressure for triggering of NTMs, βNonset, is increased. The scenario has been explored experimentally in the Joint European Torus (JET). Ion cyclotron resonance frequency (ICRF) waves tuned to the 2nd harmonic H-minority resonance have been used for sawtooth control. Whereas ICRF waves generally induce sawtooth stabilization, favouring the triggering of NTMs and reducing βNonset, the present experiments show that by toroidally directed waves, ion cyclotron current drive is produced, and that sawteeth can be destabilized by careful positioning of the 2nd harmonic H resonance layer with respect to the sawtooth inversion radius. As a result, NTM onset is delayed and βNonset is increased above its value obtained in discharges with additional heating from neutral beam injection alone.
影响因子：
3.3
作者：
Shimada, M.;Campbell, D. J.;Sipps, A. C. C.
通讯作者：
Sipps, A. C. C.
影响因子：
2.2
作者：
Sauter, O;LaHaye, RJ;Yoshino, R
通讯作者：
Yoshino, R