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ITB formation in terms of omega(ExB) flow shear and magnetic shear s on JET

机译：在JET上以omega（ExB）流动剪切和磁剪切s表示ITB的形成

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A linear empirical threshold condition omega (ExB)/gamma (ITG) > 0.68s - 0.095 has been found for the onset of the ion internal transport barriers in the JET optimised shear database. Here, s is the magnetic shear, omega (ExB) the flow shearing rate and gamma (ITG) is an approximate of the linear growth rate of the ion temperature gradient instability. The present empirical threshold condition for the ITB formation will provide a first clear indication of the strong correlation of s and omega (ExB) at the ITB transition. The empirical analysis consists of ITB discharges from a wide plasma parameter range; the toroidal magnetic field varies between 1.8-4.0 T, the auxiliary heating power between 10-30 MW and the diamagnetic energy between 3-12 MJ. The predictive simulations of several ITB discharges with the empirical ITB threshold condition reproduce the experiments with time averaged prediction errors of the order of 10-25% in T-i and T-e profiles and 10-15% in n(e) profiles as well as the toroidal flow velocity with errors of the order of 10-20%. The simulated times of the onset of the ITB compared to the experimental ones are typically within 0.4 s and the simulated ITB widths within 0.1 in r/a throughout the whole simulations. [References: 53]
机译：在JET优化剪切数据库中，已发现离子内输运势垒的线性经验阈值条件Ω（ExB）/γ（ITG）> 0.68s-0.095。此处，s是磁剪切力，Ω（ExB）是流动剪切率，γ（ITG）是离子温度梯度不稳定性的线性增长率的近似值。当前的ITB形成的经验阈值条件将提供s和Ω（ExB）在ITB过渡时的强相关性的第一个明确指示。经验分析包括来自宽血浆参数范围的ITB放电。环形磁场在1.8-4.0 T之间变化，辅助加热功率在10-30 MW之间，抗磁能在3-12 MJ之间。使用经验性ITB阈值条件对几种ITB放电进行的预测模拟，再现了实验，其中时间平均预测误差在Ti和Te轮廓中为10-25％左右，在n（e）轮廓中为10-15％左右，以及环形流速的误差约为10-20％。在整个模拟过程中，与实验相比，ITB发作的模拟时间通常在0.4 s之内，并且模拟ITB宽度在r / a的范围内为0.1 in。 [参考：53]

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