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Plasma rotation and its shear are key parameters influencing the performance of fusion devices. The prediction and control of plasma rotation velocity are of great significance for improving the stable operation and confinement of future fusion reactors. External momentum injection methods are insufficient to suppress resistive wall mode instability while achieving Q greater than 5 in International Thermonuclear Experimental Reactor (ITER). Therefore, it is necessary to conduct experimental research on intrinsic plasma rotation that does not rely on external momentum injection. To better predict the magnitude of intrinsic rotation velocity in future fusion devices, we conduct an experimental study on the scaling of residual stress and dimensionless parameters on EAST. Using the balanced neutral beam, multiple measurements of intrinsic torque are performed, providing experimental basis for predicting the intrinsic rotation in future tokamak devices. The scaling results indicate that the core residual stress is dependent on $\rho_{\ast}^{-1.80\pm1.26}$, while the scaling of edge residual stress shows an opposite trend with $\rho _{\ast }^{1.26\pm0.63}$. This suggests that as the device size increases, the core residual stress in future large devices can increase, while the edge residual stress can decrease. The difference in scaling results between the core and edge residual stress indicates that in the edge region, the symmetry-breaking mechanism other than $\mathbf{E}\times\mathbf{B}$ flow shear dominates the generation of residual stress in the scrape-off layer (SOL). A relationship is found between intrinsic torque and $\nu _{\ast }$, revealing that the core intrinsic torque depends on $\nu _{\ast }^{-0.21\pm0.18}$. Combining the scaling results of core intrinsic torque with the gyroradius and normalized collisionality, the scaling law for core intrinsic torque is obtained to be $\rho _{\ast }^{-1.39\pm0.71}\nu _{\ast }^{0.11\pm0.10}$. Using plasma parameters of ITER operation scenario 1, the core intrinsic torque in future ITER plasma is predicted to be $1.0\pm6.3$ ${\mathrm{N}}{\cdot} {\mathrm{m}}$, which is much smaller than the predicted magnitude at DIII-D.
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Keywords:
- tokamak /
- momentum transport /
- intrinsic rotation /
- scaling law
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图 1 EAST上NBI和CXRS系统的布局
Figure 1. Layout of NBI and CXRS systems at EAST
图 2 时间演化: (a)等离子体电流; (b)等离子体储能; (c)中性束功率; (d)平均电子密度; (e)芯部电子温度; (f)芯部离子温度; (g)芯部环向旋转速度
Figure 2. Time evolutions of: (a) plasma current; (b) stored energy; (c) neutral beam source power; (d) line-averaged electron density; (e) central electron temperature; (f) central ion temperature; and (g) central toroidal rotation velocity.
图 3 $ \# $90833不同驱动方案下NBI扭矩密度和环向旋转速度的比较. (a) NBI的总输入扭密度; (b) 等离子体环向旋转速度
Figure 3. $ \# $90833 Comparison of NBI torque density and toroidal rotation velocity among different momentum driving schemes. (a) total input torque densities from NBIs; (b) toroidal rotation velocities.
图 4 放电$ \# $90833在4.69 s时: (a)电子密度和安全因子; (b)电子和离子温度; (c)环向旋转速度分布
Figure 4. Profiles of: (a) electron density and safety factor, (b) electron and ion temperature, and (c) toroidal rotation velocity at 4.69 s of discharge $ \# $90833.
图 5 (a) TransROTA计算的速度相关项的径向分布; (b) TRANSP/NUBEAM计算的NBI力矩密度、速度相关项以及自发扭矩密度之间的对比
Figure 5. (a) Radial distributions of TransROTA-calculated velocity-dependent terms (b) Comparison among TRANSP/NUBEAM-calculated NBI injected torque densities, veolocity-dependent terms and intrinsic torque densities.
图 6 (a) NBI力矩密度和自发扭矩力矩密度的径向分布; (b) 体积分后的力矩分布. 两种不同的自发扭矩定义及其积分区域如图(a)和(b)所示
Figure 6. (a) Radial distributions of NBI and intrinsic torque densities; (b) volume-integrated torque profiles. Two different definitions of intrinsic torque and their integral ranges are shown in (a) and (b).
图 7 自发扭矩与$ \rho_{\ast} $的定标结果
Figure 7. Scaling results of intrinsic torques as a function of $ \rho_{\ast} $.
图 8 芯部自发扭矩与$ \nu_{\ast} $的定标结果
Figure 8. Scaling results of intrinsic torques as a function of $ \nu_{\ast} $.
图 9 芯部自发扭矩与压力梯度的定标关系
Figure 9. Scaling results of core intrinsic torques as a function of pressure gradients.
图 10 边界自发扭矩与压力梯度的定标关系
Figure 10. Scaling results of edge intrinsic torques as a function of pressure gradients.
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