Zhang D, König R, Feng Y, Burhenn R, Brezinsek S, Jakubowski M, Buttenschön B, Niemann H, Pavone A, Krychowiak M, Kwak S, Svensson J, Gao Y, Pedersen T S, Alonso A, Baldzuhn J, Beidler C D, Biedermann C, Bozhenkov S, Brunner K J, Damm H, Hirsch M, Giannone L, Drewelow P, Effenberg F, Fuchert G, Hammond K C, Höfel U, Killer C, Knauer J, Laqua H P, Laube R, Pablant N, Pasch E, Penzel F, Rahbarnia K, Reimold F, Thomsen H, Winters V, Wagner F, Klinger T
Max-Planck-Institut für Plasmaphysik, 17491 Greifswald, Germany.
Forschungszentrum Jülich GmbH, IEK-4 52425 Jülich, Germany.
Phys Rev Lett. 2019 Jul 12;123(2):025002. doi: 10.1103/PhysRevLett.123.025002.
For the first time, the optimized stellarator Wendelstein 7-X has operated with an island divertor. An operation regime in hydrogen was found in which the total plasma radiation approached the absorbed heating power without noticeable loss of stored energy. The divertor thermography recorded simultaneously a strong reduction of the heat load on all divertor targets, indicating almost complete power detachment. This operation regime was stably sustained over several energy confinement times until the preprogrammed end of the discharge. The plasma radiation is mainly due to oxygen and is located at the plasma edge. This plasma scenario is reproducible and robust at various heating powers, plasma densities, and gas fueling locations. These experimental results show that the island divertor concept actually works and displays good power dissipation potential, producing a promising exhaust concept for the stellarator reactor line.
优化后的仿星器文德尔施泰因7-X首次采用岛式偏滤器运行。在氢等离子体运行模式下，发现总等离子体辐射接近吸收的加热功率，且储能无明显损失。偏滤器热成像同时记录到所有偏滤器靶上的热负荷大幅降低，表明几乎完全实现了功率脱耦。这种运行模式在几个能量约束时间内稳定维持，直至放电按预编程结束。等离子体辐射主要由氧引起，位于等离子体边缘。这种等离子体状态在各种加热功率、等离子体密度和气体燃料注入位置下均可重现且稳定。这些实验结果表明，岛式偏滤器概念确实可行，展现出良好的功率耗散潜力，为仿星器反应堆系列提供了一个有前景的排气概念。
