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首页> 外文期刊>Plasma physics and controlled fusion >Benchmarking the GENE and GYRO codes through the relative roles of electromagnetic and E x B stabilization in JET high-performance discharges
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Benchmarking the GENE and GYRO codes through the relative roles of electromagnetic and E x B stabilization in JET high-performance discharges

机译：通过电磁和E x B稳定在JET高性能放电中的相对作用来对GENE和GYRO代码进行基准测试

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摘要

Nonlinear gyrokinetic simulations using the GENE code have previously predicted a significant nonlinear enhanced electromagnetic stabilization in certain JET discharges with high neutral-beam power and low core magnetic shear (Citrin et al 2013 Phys. Rev. Lett. 111 155001, 2015 Plasma Phys. Control. Fusion 57 014032). This dominates over the impact of E x B flow shear in these discharges. Furthermore, fast ions were shown to be a major contributor to the electromagnetic stabilization. These conclusions were based on results from the GENE gyrokinetic turbulence code. In this work we verify these results using the GYRO code. Comparing results (linear frequencies, eigenfunctions, and nonlinear fluxes) from different gyrokinetic codes as a means of verification (benchmarking) is only convincing if the codes agree for more than one discharge. Otherwise, agreement may simply be fortuitous. Therefore, we analyze three discharges, all with a carbon wall: a simplified, two-species, circular geometry case based on an actual JET discharge; an L-mode discharge with a significant fast-ion pressure fraction; and a low-triangularity high-beta hybrid discharge. All discharges were analyzed at normalized toroidal flux coordinate rho = 0.33 where significant ion temperature peaking is observed. The GYRO simulations support the conclusion that electromagnetic stabilization is strong, and dominates E x B shear stabilization.
机译：之前使用GENE代码进行的非线性陀螺动力学仿真已经预测到某些JET放电具有高中性束功率和低磁芯磁切变的显着非线性增强的电磁稳定性（Citrin等人2013 Phys。Rev.Lett.111155001，2015 Plasma Phys.Control （Fusion 57 014032）。在这些放电中，E x B流动剪切的影响占主导地位。此外，快离子被证明是电磁稳定的主要贡献者。这些结论基于GENE陀螺动荡码的结果。在这项工作中，我们使用GYRO代码验证了这些结果。仅当代码同意不止一次放电时，才比较有说服力的比较不同陀螺动力学代码的结果（线性频率，本征函数和非线性通量）作为验证（基准测试）的手段。否则，协议可能只是偶然的。因此，我们分析了三个均带有碳壁的放电：一个基于实际JET放电的简化的，两种物种的圆形几何案例;具有显着快离子压力分数的L模式放电;和低三角形高β混合放电。在归一化的环形通量坐标rho = 0.33处分析了所有放电，在该处观察到明显的离子温度峰值。 GYRO仿真支持以下结论：电磁稳定性强，并且在E x B剪切稳定性中占主导地位。

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