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The operation region and MHD modes on the J-TEXT tokamak

机译：J-TEXT托卡马克上的操作区域和MHD模式

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摘要

The operation region and the parameter region of magnetohydrodynamic (MHD) modes are analyzed for J-TEXT Ohmic discharges. The operation region is described by the Hugill diagram, which combines low-q and high density limits. It is found that the operation region has expanded over the years on J-TEXT. In detail, the high density limit has increased from less than 0.5n(G) to 0.7n(G) and the low-q limit has lowered from 2.8 to 2.2; this is due to the reduced impurity content that results from coating graphite on the wall. Furthermore, the operation region has further expanded to 0.85n(G) and q(a) similar to 2.0, respectively-a result of suppressing the disruptive precursor MHD by using externally-applied resonant magnetic perturbations (RMPs). Here, n(G) and q(a) are the Greenwald density limit and edge safety factor, respectively. Corresponding to the results of the operation region, the parameter regions of MHD modes are presented. It is found that a m = 2/1 tearing mode (TM) appears for a wide parameters region with 2.4 < q(a) < 4 and n(e) < 3 x 10(19) m(-3)- here m and n are the poloidal and toroidal mode numbers. Furthermore, other MHD modes such as m = 5/2, 3/1, 4/1 and 7/2, appear only when their rational surfaces are close to the plasma edge or m similar to q(a), and these MHD modes may transit to a 2/1 TM when changing the plasma parameters. In addition, correlation analysis between the amplitude and frequency of the dominant 2/1 TM for different plasma conditions reveals that there is a threshold between normal discharges and density-limit discharges, which would be a reference to predict density-limit disruptions.
机译：分析了J-TEXT欧姆放电的磁流体动力学（MHD）模式的操作区域和参数区域。操作区域由Hugill图描述，该图结合了低q和高密度极限。发现多年来，在J-TEXT上操作区域已扩展。详细地，高密度极限已从小于0.5n（G）增加到0.7n（G），低q极限已从2.8降低到2.2。这是由于在壁上涂覆石墨导致杂质含量降低所致。此外，操作区域进一步扩展到分别类似于2.0的0.85n（G）和q（a），这是通过使用外部施加的共振磁扰动（RMP）抑制破坏性前驱体MHD的结果。在此，n（G）和q（a）分别是格林瓦尔德密度极限和边缘安全系数。对应于操作区域的结果，给出了MHD模式的参数区域。发现对于2.4

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