Divertor detachment with neon seeding in grassy-ELM H-mode in EAST
Divertor detachment with neon seeding in grassy-ELM H-mode in EAST
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EAST 草地 ELM H 模式下霓虹灯播种的偏滤器脱离
DOI：
10.1088/1361-6587/aba859
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发表时间：
2020-08
影响因子：
2.2
通讯作者：
Guang-Nan Luo
中科院分区：
文献类型：
--
作者：
Kedong Li;Guosheng Xu;Zhongshi Yang;Liang Wang;Qiping Yuan;Jianbin Liu;Huiqian Wang;Houyang Guo;David Eldon;Alan Hyatt;David Humphreys;Qingquan Yang;Xin Lin;Jichan Xu;Lingyi Meng;Fang Ding;Xiahua Chen;Jinhua Wu;Kai Wu;Yanmin Duan;Guang-Nan Luo
同时控制由大振幅边缘局域模式（ELMs）引起的瞬态热负荷和转流器目标的时间平均热通量和粒子通量是未来托卡马克聚变反应堆稳态运行的关键问题。转向器分离和grass - elm体系的结合为该问题提供了一种候选解决方案。grass - elm体制强大的粒子排气能力极大地促进了带有分流器杂质播种的分离等离子体的稳态运行。自2018年以来，在具有类似iter的钨单块上部导流器的EAST超导托卡马克中，通过播种5%氖（Ne）和95% D2混合物，在草- elm状态下实现了稳定的内靶完全分离和外靶部分分离。上部外部和内部导流器目标的峰值离子通量（Γion）分别降低了55%和92%。然而，它伴随着约束退化，等离子体储存能量WMHD降低18%。相比之下，上部外导流器目标的局部脱离与约束改善已经实现，通过分离矩阵（Psep）的功率在h模阈值功率附近。此外，在q95相对较低（~ 5.7）且Bt方向不利的情况下，Ne的播种导致混合（大/小）ELM状态向ELM频率显著增加的草-ELM状态过渡，使草-ELM状态的可达参数范围向低q95方向扩展。
Simultaneous control of the transient heat load induced by the large-amplitude edge-localized modes (ELMs) and the time-averaged heat and particle fluxes to the divertor targets is a critical issue for the steady-state operation of a future tokamak fusion reactor. The combination of divertor detachment and grassy-ELM regime provides a candidate solution to this issue. The strong particle exhaust capability of the grassy-ELM regime greatly facilitates the achievement of steady-state operation of a detached plasma with divertor impurity seeding. Stable complete detachment at inner target and partial detachment at outer target in the grassy-ELM regime have been achieved with seeding of 5% neon (Ne) and 95% D2 mixture since 2018 in the EAST superconducting tokamak with ITER-like tungsten monoblock upper divertor. The peak ion fluxes (Γion) on the upper outer and inner divertor targets were reduced by 55% and 92%, respectively. However, it was accompanied by confinement degradation with 18% reduction in the plasma stored energy WMHD. In contrast, partial detachment on the upper outer divertor target with confinement improvement has been achieved with the power across the separatrix (Psep) around the H-mode threshold power. In addition, at relatively lower q95 (∼5.7) with unfavorable Bt direction, Ne seeding leads to a transition from mixed (large/small) ELM regime into grassy-ELM regime with significantly increased ELM frequency, which extends the accessible parameter range of the grassy-ELM regime towards lower q95.
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影响因子：
3.1
作者：
M. Reinke;J. Hughes;A. Loarte;D. Brunner;I. Hutchinson;B. LaBombard;J. Payne;J. Terry
通讯作者：
M. Reinke;J. Hughes;A. Loarte;D. Brunner;I. Hutchinson;B. LaBombard;J. Payne;J. Terry
影响因子：
0.8
作者：
Y. Ueda
通讯作者：
Y. Ueda
影响因子：
1.7
作者：
A. Raffray;R. Nygren;D. Whyte;S. Abdel-Khalik;R. Doerner;F. Escourbiac;T. Evans;R. Goldston;D. Hoelzer;S. Konishi;P. Lorenzetto;M. Merola;R. Neu;P. Norajitra;R. Pitts;M. Rieth;M. Roedig;T. Rognlien;S. Suzuki;M. Tillack;C. Wong
通讯作者：
A. Raffray;R. Nygren;D. Whyte;S. Abdel-Khalik;R. Doerner;F. Escourbiac;T. Evans;R. Goldston;D. Hoelzer;S. Konishi;P. Lorenzetto;M. Merola;R. Neu;P. Norajitra;R. Pitts;M. Rieth;M. Roedig;T. Rognlien;S. Suzuki;M. Tillack;C. Wong
影响因子：
3.3
作者：
Kevin Verhaegh;B. Lipschultz;B. Duval;O. F'evrier;A. Fil;C. Theiler;M. Wensing;C. Bowman;D. Gahle;J. Harrison;B. Labit;C. Marini;R. Maurizio;H. D. Oliveira;H. Reimerdes;U. Sheikh;C. Tsui;N. Vianello;W. Vijvers;The Tcv Team;The EUROfusion MST1 Team
通讯作者：
Kevin Verhaegh;B. Lipschultz;B. Duval;O. F'evrier;A. Fil;C. Theiler;M. Wensing;C. Bowman;D. Gahle;J. Harrison;B. Labit;C. Marini;R. Maurizio;H. D. Oliveira;H. Reimerdes;U. Sheikh;C. Tsui;N. Vianello;W. Vijvers;The Tcv Team;The EUROfusion MST1 Team
影响因子：
3.3
作者：
M. Schaffer;J. Menard;M. Aldan;J. Bialek;T. Evans;R. Moyer
通讯作者：
M. Schaffer;J. Menard;M. Aldan;J. Bialek;T. Evans;R. Moyer