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Temperature dependence of the thermal diffusivity in high-collisionality regimes in the large helical device

机译：大型螺旋装置中高碰撞状态下热扩散率的温度依赖性

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摘要

The positive density dependence of energy confinement times, tau(E), as expressed in the international stellarator scaling 95 (ISS95), where tau(E) proportional to n(e)(-0.51) P-0.59 in is the line-averaged density and P is the heating power), declines in high-collisionality regimes in the large helical device experiments. In the low-collisionality regime, where parameter dependences in ISS95 agree well with the experiment, the temperature dependence of thermal diffusivity is as strong as predicted by the gyro-Bohm model and/or the neoclassical theory. As the collisionality increases to the plateau regime, the temperature dependence becomes moderate, where the thermal diffusivity is proportional to the square root of the electron temperature. Furthermore, the thermal diffusivity is inversely proportional to the magnetic field strength and the electron temperature gradient is proportional to the electron temperature in the high-collisionality regime. Compared with ISS95, the energy confinement time expected from these observations has a weaker density dependence together with mitigated power degradation: tau E proportional to n(e)(-1/3) P-1/3.
机译：能量约束时间tau（E）与密度的正密度相关性，如国际恒星标度95（ISS95）所示，其中tau（E）与n（e）（-0.51）P-0.59 in成正比密度，P是加热功率），在大型螺旋设备实验中，高碰撞率下会下降。在低碰撞状态下，ISS95中的参数相关性与实验非常吻合，热扩散率的温度相关性与陀螺-博姆模型和/或新古典理论所预测的一样强。随着碰撞性增加到平稳状态，温度依赖性变得适中，其中热扩散率与电子温度的平方根成比例。此外，在高碰撞状态下，热扩散率与磁场强度成反比，电子温度梯度与电子温度成正比。与ISS95相比，根据这些观察结果预期的能量约束时间具有较弱的密度依赖性以及缓解的功率下降：tau E与n（e）（-1/3）P-1 / 3成比例。

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