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Edge transport barrier formation in compact helical system

机译:紧凑型螺旋系统中的边缘传输势垒形成

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The edge transport barrier (ETB) for particle transport is formed in the neutral beam (NB) heated hydrogen discharges in compact helical system (CHS). The transition to the ETB formation and the back transition are controlled by the heating power. The existence of the heating power threshold is confirmed and it is roughly proportional to the density. The Ha emission signal shows a clear drop at the transition (the timescale of signal decrease is similar to1 ms for the high heating power case). The ETB formation continues for the full duration of NB injection (100 ms) with a moderate level of radiation power loss. Local density profile measurement shows increase of the edge density and the movement of the density gradient region towards the edge.
机译:在紧凑螺旋系统(CHS)中,在中性束(NB)加热的氢气排放中形成了用于颗粒传输的边缘传输屏障(ETB)。向ETB形成的转变和向后转变由加热功率控制。确认存在加热功率阈值,并且该阈值与密度大致成比例。 Ha发射信号在过渡时显示出明显的下降(对于高火力情况,信号下降的时间尺度类似于1 ms)。 ETB的形成在NB注入的整个持续时间内(100毫秒)持续进行,并且辐射功率损失中等。局部密度分布测量显示边缘密度增加,并且密度梯度区域向边缘移动。

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