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早在第12届IAEA等离子体物理与受控核聚变会议上曾讨论了由峰化密度分布引起的或与峰化密度分布相关的约束改善以及与离子温度梯度模η_i的抑制的可能关系。国际上一些装置的实验也确认了导致n_e(r)分布峰化的许多放电状态,即弹丸(PI)深层加料、NBI分子束的反向注入以及锯齿活性的自发抑制,同时也发现在导致改善Ω约束状态时,喷气速率降低也能引起向峰化密度分布的转变。对所有这些具有峰化密度分布情况共同的特征是相对于Ω加热或L状态放电τ_e、τ_p得到改善,可以说大多数改善了的约束是在峰化密度分布的情况下获得的。与高约束H模式约束改善的物理原因
As early as the 12th IAEA Conference on Plasma Physics and Controlled Fusion, we discussed the possible improvement of the constraint associated with or related to the distribution of peaking density and the possible relationship with the suppression of ion temperature gradient mode η_i. Some international experiments have also confirmed many discharge states that lead to peak peaking of n_e (r), that is, deep feeding of projectile (PI), reverse injection of NBI molecular beam and spontaneous inhibition of sawtooth activity. In addition, In the Ω-constrained state, a decrease in the gas jet rate can also cause a shift to a peaking density distribution. A common feature for all of these with peaking density distribution is the improvement in τ_e and τ_p with respect to Ω heating or L-state discharge. It can be said that most of the improved constraints are obtained with peaking density distribution. Physical Constraints with High Constraint H-Mode Constraints