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首页> 外文期刊>Plasma physics and controlled fusion >Effect of triangular and elongated plasma shape on the sawtooth stability
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Effect of triangular and elongated plasma shape on the sawtooth stability

机译：三角形和细长等离子体形状对锯齿稳定性的影响

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In the TCV tokamak the sawtooth period and the sawtooth amplitude are observed to depend strongly on the shape of the poloidal plasma cross section. Systematic scans of plasma elongation and triangularity show small sawteeth with short periods at high elongation or low and negative triangularity, and large sawteeth with long periods at low elongation or high triangularity. Additional central electron cyclotron heating power further amplifies the shape dependence of the sawtooth properties. The sawtooth period can increase or decrease with additional heating power depending on the plasma shape. This shape dependence is determined by the role of ideal or resistive MHD in triggering the sawtooth crash. For plasma shapes where additional heating and, consequently, a higher pressure shortens the sawtooth period, the low experimental limit of the pressure gradient within the q = 1 surface is consistent with ideal MHD predictions. The observed decrease of this limit with elongation is also in qualitative agreement with ideal MHD theory. [References: 18]
机译：在TCV托卡马克中，观察到锯齿周期和锯齿幅度强烈依赖于极向等离子体截面的形状。对血浆伸长率和三角形性的系统扫描显示，小锯齿在高伸长率或低和负三角形中具有短周期，而大锯齿在低伸长率或高三角形性时具有较长的周期。附加的中央电子回旋加速器加热功率进一步放大了锯齿特性的形状依赖性。锯齿周期可随等离子形状的增加而增加或减少。这种形状依赖性取决于理想或电阻MHD在触发锯齿碰撞中的作用。对于等离子形状，其中需要额外加热，因此，较高的压力会缩短锯齿周期，因此q = 1表面内压力梯度的较低实验极限与理想的MHD预测一致。观察到的该极限随伸长率的降低也与理想的MHD理论在质量上吻合。 [参考：18]

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