AI 中文总结
该研究用EUTERPE代码分析托卡马克中等离子体压强梯度驱动的不稳定性，发现ITG与KBM的转变依赖平衡一致性，且非MHD贡献在特定条件下影响稳定性，为托卡马克不稳定性研究提供了新的参考。
AI 中文摘要
采用全局陀螺动理学代码EUTERPE研究托卡马克等离子体中的压强梯度驱动不稳定性，重点关注中等高模数的作用。若固定磁流体动力学（MHD）几何，当归一化等离子体压强β增大时，会出现从离子温度梯度（ITG）不稳定性到动力学气球模（KBM）的熟知突变；但若对每个β值重新计算平衡场，使平衡与稳定性计算一致，该转变会消失，许多情况下仅当使用不一致平衡时才能观测到ITG-KBM转变。在MHD不稳定区域，当离子温度梯度与密度梯度的比值中等且离子回旋半径较小时，陀螺动理学模拟与MHD稳定性计算吻合良好；否则非MHD贡献（如抗磁稳定化和离子波-粒子共振效应）起重要作用。
英文摘要
Pressure gradient-driven instabilities are investigated in tokamak plasmas using the global gyrokinetic code EUTERPE emphasizing the role of moderate high mode numbers. As the normalized plasma pressure $β$ is increased, there is a well-known, sudden transition from ion-temperature-gradient (ITG) instabilities to kinetic ballooning modes (KBM), if the magnetohydrodynamic (MHD) geometry is held fixed. However, if the equilibrium field is recomputed for each value of $β$, so that the equilibrium is consistent with the stability calculation, the transition can disappear. In a number of cases, we are only able to find an ITG-KBM transition if inconsistent equilibria are used. In the MHD unstable regime, gyrokinetic simulations and MHD stability calculations show good agreement for moderate ratios of ion temperature gradient to density gradient and small values of the ion gyro-radius. Otherwise, non-MHD contributions are important, such as the diamagnetic stabilization and ion wave--particle resonant effects.
