J-TEXT 学术报告第56期

时 间： 2016年11月2日（周三） 8:30

地 点： 二楼会议室

ITPA MHD会议总结

报告人：陈忠勇

实验提案总结汇报

报告人1：黄名响

题目：Statistical analysis of minor disruptions during mode locking

摘要：Some statistical analysis of minor disruptions during mode locking has been done on the J-TEXT tokamak. It has been found that the time interval between the time RMP penetration and the time that the first minor disruption appears may depend on density, the dropped temperature just beside the 2/1 magnetic island maybe also depends on density. The relationship between magnetic perturbation and density, magnetic perturbation and temperature perturbation and so on has also been analyzed.

报告人2：张君

题目：电磁能量转移实验研究

摘要：提案主要包含两个实验内容，一个是能量转移线圈电流对电流猝灭速率和环电压的影响，一个是能量转移对逃逸电流的抑制效果研究。在投入和不投入能量转移系统的情况下，对比电流猝灭速率、环电压大小和热辐射，得到能量转移可以将电流猝灭速率提高50%左右，同时将环电压降低50%左右，对热辐射信号也有明显的减小效果。由于能量转移可以降低破裂环电压，能量转移也可以抑制逃逸电流的形成。在通过MGI产生稳定逃逸电流的情况下，能量转移可以明显降低逃逸电流的大小，并取得了非常好的重复效果。

报告人3：黄都伟 （并代陈忠勇）

题目：Effect of RMP field penetration/induced locked mode on runaway suppression during disruptions

摘要：Recent research on the mechanisms of plasma disruption and runaway current generation gives a conjecture that the runaway beam is formed in the central plasma region. The outer most intact magnetic surface forms a transport barrier, and electrons in this confined region can be accelerated to run away by the inductive toroidal electric field. Resonant magnetic perturbation(RMP) coils were applied to impact the magnetic field structure and influence runaway current generation. RMP field penetration before disruption can suppress runaway beam formation, and the suppress effect is related to qa. Locked mode induced by RMP before disruption also can impact runaway generation. It is found that applying out-vessel coils (SRMP)shows a remarkable runaway suppress effect, and applying in-vessel coils (DRMP)only gives a partial suppress effect. This may be attributed to the different magnetic field spectrum of magnetic perturbation coils.

报告人4：魏禹农

题目：Dissipation of runaway current by massive gas injection on J-TEXT

摘要：Plasma disruption is one of the major challenges for ITER. Severe energy releases in several milliseconds and massive runaway electrons (REs) produced during disruption phase lead to heat loads and halo current which can destroy the first wall. Transforming the pre-disruption plasma current into runaway current and dissipating it maybe one of the way to mitigate the energy release. Argon and neon impurities injected into runaway current plateau by massive gas injection (MGI) valve have been performed in several experimental conditions on J-TEXT. Runaway currents are formed by ~10¹⁹ argon atoms injection, and then large quantities of argon or neon impurities are injected for runaway current dissipation during runaway current plateau phase. For 100kA runaway current, we find that the decay rate increases quickly with the gas injected rising, and then reaches to a maximum value v_max=26MA/s for argon and 16MA/s for neon, which is decided by the runaway electron energy and the kind of impurities. The tendency of decay rate changing with gas injection can be described as an experiential exponential curve. At last, a few discharges with different runaway currents indicate that the decay rate of runaway current is connected with the kinetic energy of runaway electron.