1月21日 五室第304期研讨会（邀请报告）

报告题目：On the accuracy of the standard formula for diamagnetic signal in a tokamak  

报 告 人：Prof. Vladimir Pustovitov (National Research Centre ‘Kurchatov Institute)

主 持 人：孙有文研究员

时    间：2026年1月21日（星期三）上午09:00-10:00

地    点：8-2楼224会议室

报告摘要：

Using the SPIDER code, calculations of plasma equilibrium in a tokamak with a circular plasma in a wide range of and (poloidal beta and internal inductance) were performed. The obtained values of the diamagnetic signal are compared with the predictions of the standard formula for tokamaks. The detected differences are analyzed using exact virial relations, an approximate consequence of which is this formula, as shown by Lao et al. [Nucl. Fusion 25, 1421 (1985)]. The reasons for the difference and the range of parameters where the accuracy of the formula is insufficient to interpret the data are identified. It is proved that the loss of accuracy in analytical theory is due to the fact that, when calculating the diamagnetic signal, only linear corrections in the inverse aspect ratio were taken into account. 

Based on the paper A. A. Martynov and V. D. Pustovitov, Phys. Plasmas 32,092506 (2025) https://doi.org/10.1063/5.0291067  

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