Wang L, Wang H Q, Ding S, Garofalo A M, Gong X Z, Eldon D, Guo H Y, Leonard A W, Hyatt A W, Qian J P, Weisberg D B, McClenaghan J, Fenstermacher M E, Lasnier C J, Watkins J G, Shafer M W, Xu G S, Huang J, Ren Q L, Buttery R J, Humphreys D A, Thomas D M, Zhang B, Liu J B
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China.
General Atomics, San Diego, CA, USA.
Nat Commun. 2021 Mar 1;12(1):1365. doi: 10.1038/s41467-021-21645-y.
Divertor detachment offers a promising solution to the challenge of plasma-wall interactions for steady-state operation of fusion reactors. Here, we demonstrate the excellent compatibility of actively controlled full divertor detachment with a high-performance (β ~ 3, H ~ 1.5) core plasma, using high-β (poloidal beta, β > 2) scenario characterized by a sustained core internal transport barrier (ITB) and a modest edge transport barrier (ETB) in DIII-D tokamak. The high-β high-confinement scenario facilitates divertor detachment which, in turn, promotes the development of an even stronger ITB at large radius with a weaker ETB. This self-organized synergy between ITB and ETB, leads to a net gain in energy confinement, in contrast to the net confinement loss caused by divertor detachment in standard H-modes. These results show the potential of integrating excellent core plasma performance with an efficient divertor solution, an essential step towards steady-state operation of reactor-grade plasmas.
偏滤器脱靶为聚变反应堆稳态运行中面临的等离子体与壁相互作用挑战提供了一个有前景的解决方案。在此，我们利用DIII-D托卡马克中以持续的芯部内部输运垒（ITB）和适度的边缘输运垒（ETB）为特征的高β（极向β，β＞2）工况，展示了主动控制的全偏滤器脱靶与高性能（β～3，H～1.5）芯部等离子体的优异兼容性。高β高约束工况促进了偏滤器脱靶，反过来又在大半径处促进了更强的ITB的发展，同时ETB减弱。ITB和ETB之间这种自组织协同作用导致能量约束净增益，这与标准H模中偏滤器脱靶导致的约束净损失形成对比。这些结果表明了将优异的芯部等离子体性能与高效的偏滤器解决方案相结合的潜力，这是朝着反应堆级等离子体稳态运行迈出的关键一步。
