4月18日 五室第278期研讨会

报告题目； HL-3 Super H模运行模式研究

报 告 人： 朱毅仁 博士

主 持 人： 李彦龙 博士

时    间：  2025年4月18日（星期五）下午14:00-15:00

地    点：  8-2楼224会议室

摘    要：

As the newly built tokamak in China, HL-3 is going to explore high performance operation scenario such as super H-mode. The energy confinement and core parameters in super H-mode can be much larger than that in normal H-mode. Based on the pedestal simulation code EPED, the operation space of super H-mode is obtained in HL-3. Magnetic shear decreases with increasing triangularity, and then the super H-mode can be achieved. The threshold of triangularity for accessing super H-mode in HL-3 is around 0.4. By using BOUT++, nonlinear simulation study of the pedestal instabilities in super H-mode equilibrium is executed for the first time. As expected, low n peeling mode which can cause much energy loss (17%) from the pedestal region is dominant in super H-mode. Such a big collapse at pedestal region will lead the transition of super H-mode to H-mode. It is crucial to expand the parameter space of the super H-mode or mitigate the ELM size for sustaining the super H-mode operation. E×B velocity shear is found to play an important role for controlling the ELMs in HL-3. On the one hand, small E×B velocity shear leads to large growth rate but small ELM size around peeling boundary. ELM size is determined by the product of growth rate of peeling-ballooning mode and duration time of linear phase. On the other hand, large E×B velocity shear can stabilize the instabilities near ballooning boundary, and then the parameter space of super H-mode will be enlarged. Moreover, initial experiments for exploring the path to achieve super H-mode on HL-3 are executed. The triangularity plays an important role in determining the characteristics of ELMs. And supersonic molecular beam injection can increase the density rapidly after the L-H transition. More experiments are still needed to be designed on purpose for super H-mode study on HL-3.

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