论文标题
Tokamak磁平衡重建中的系统错误：tokamak Compass的EFIT ++的研究
Systematic errors in tokamak magnetic equilibrium reconstruction: a study of EFIT++ at tokamak COMPASS
论文作者
论文摘要
磁平衡重建的不确定性和错误是解释在Tokamak边缘测量的实验数据的广泛问题。这项研究表明，通过将外部中平面分离位置与速度剪切层（VSL）位置进行比较，在指南针托卡马克上执行的EFIT ++重建错误。检测到VSL是通过往复球pen探针测量的血浆电位峰。随后对近400次放电的统计分析显示，相对于VSL，重建的分离质位置的系统趋势很强，其中主要因素是血浆三角形和磁轴径向位置。优化了EFIT输入中记录的测量线圈位置后，该依赖性显着降低，以在真空放电中由生物 - 萨瓦特定律计算出的“合成”线圈信号与实际线圈信号之间的“合成”线圈信号。总之，我们建议应用此优化可能会导致指南针平衡的更准确和可靠的重建，这将对在边缘等离子体中执行的测量分析的准确性产生积极影响。
Uncertainties and errors in magnetic equilibrium reconstructions are a wide-spread problem in interpreting experimental data measured in the tokamak edge. This study demonstrates errors in EFIT++ reconstructions performed on the COMPASS tokamak by comparing the outer midplane separatrix position to the Velocity Shear Layer (VSL) position. The VSL is detected as the plasma potential peak measured by a reciprocating ball-pen probe. A subsequent statistical analysis of nearly 400 discharges shows a strong systematic trend in the reconstructed separatrix position relative to the VSL, where the primary factors are plasma triangularity and the magnetic axis radial position. This dependency is significantly reduced after the measuring coils positions as recorded in EFIT input are optimised to provide a closer match between the "synthetic" coil signal calculated by the Biot-Savart law in a vacuum discharge and the actual coil signal. In conclusion, we suggest that applying this optimisation may lead to more accurate and reliable reconstructions of the COMPASS equilibrium, which would have a positive impact on the accuracy of measurement analysis performed in the edge plasma.
