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Kinetic equilibrium reconstructions of plasmas in the MAST database and preparation for reconstruction of the first plasmas in MAST upgrade
Plasma Physics and Controlled Fusion ( IF 2.1 ) Pub Date : 2021-04-14 , DOI: 10.1088/1361-6587/abf230
J W Berkery 1 , S A Sabbagh 1 , L Kogan 2 , D Ryan 2 , J M Bialek 1 , Y Jiang 1 , D J Battaglia 3 , S Gibson 4 , C Ham 2
Affiliation  

Reconstructions of plasma equilibria using magnetic sensors were routine during operation of the Mega Ampere Spherical Tokamak (MAST) device, but reconstructions using kinetic profiles were not. These are necessary for stability and disruption analysis of the MAST database, as well as for operation in the upgrade to the device, MAST-U. The three-dimensional (3D) code VALEN is used to determine eddy currents in the 3D vessel structures for vacuum coil test shots, which are then mapped to effective resistances in the two-dimensional vessel groupings in the EFIT equilibrium reconstruction code to be used in conjunction with nearby loop voltage measurements for estimated currents in the structures during reconstruction. Kinetic equilibrium reconstructions with EFIT, using all available magnetic sensors as well as Thomson scattering measurements of electron temperature and density, charge exchange recombination spectroscopy measurements of ion temperature, and internal magnetic field pitch angle measurements from a motional Stark effect (MSE) diagnostic are performed for a large database of MAST discharges. Excellent convergence errors are obtained for the portions of the discharges where the stored energy was not too low, and it is found that reconstructions performed with temperature and density measurements but without MSE data usually already match the pitch angle measurements well. A database of 275 kinetic equilibria is used to test the ideal MHD stability calculation capability for MAST. Finally, the necessary changes to conducting structure in VALEN, and diagnostic setup in EFIT have been completed for the upgrade from MAST to MAST-U, enabling kinetic reconstructions to commence from the first plasma discharges of the upgraded device.



中文翻译:

MAST 数据库中等离子体的动力学平衡重建以及 MAST 升级中第一批等离子体的重建准备

在兆安培球形托卡马克 (MAST) 装置运行期间,使用磁传感器重建等离子体平衡是例行公事,但使用动力学曲线重建则不然。这些对于 MAST 数据库的稳定性和中断分析以及升级到设备 MAST-U 的操作是必需的。三维 (3D) 代码 VALEN 用于确定真空线圈测试射击的 3D 容器结构中的涡流,然后将其映射到 EFIT 平衡重建代码中二维容器分组中的有效电阻,以用于结合附近环路电压测量,用于在重建期间估计结构中的电流。使用 EFIT 进行动力学平衡重建,使用所有可用的磁传感器以及电子温度和密度的汤姆森散射测量、离子温度的电荷交换复合光谱测量以及来自运动斯塔克效应 (MSE) 诊断的内部磁场俯仰角测量,都可用于 MAST 的大型数据库放电。对于存储能量不太低的放电部分,获得了极好的收敛误差,并且发现使用温度和密度测量但没有 MSE 数据执行的重建通常已经很好地匹配桨距角测量。275 个动力学平衡的数据库用于测试 MAST 的理想 MHD 稳定性计算能力。最后,对 VALEN 中的传导结构进行必要的更改,

更新日期:2021-04-14
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