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Robustness of the tokamak error field correction tolerance scaling

机译：Tokamak错误场校正公差缩放的鲁棒性

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摘要

This paper presents the subtleties of obtaining robust experimental scaling laws for the core resonant error field threshold that leads to field penetration, locked modes, and disruptions. Recent progress in attempts to project this threshold to new machines has focused on advances in the metric used to quantify the dangerous error fields, incorporating the ideal MHD plasma response in a metric referred to as the 'dominant mode overlap'. However, the scaling of this or any quantity with experimental parameters known to be important for the complicated tearing layer physics requires regressions performed for databases that, for historical reasons, unevenly sample the available parametric space. This paper presents the distribution of the existing internationaln= 1 database and details biases in the available sampling and details the sensitivity of ITER projections to simple least-squares regressions. Downsampling and a simple kernel density estimation weighted regression are used here to demonstrate the difference in projections that acknowledging the machine sampling bias can make. This results in more robust projection to parameters far from the 'usual' devices built thus far. Two multi-device and multi-parameter scalings of the EF threshold in Ohmic and powered plasmas are presented, projecting the threshold to ITER and investigating the impact of sampling biases.
机译：本文介绍了获取核心谐振误差场阈值的强大实验缩放法律的微妙之处，导致现场穿透，锁定模式和中断。尝试将此阈值投入到新机器的最新进展集中在用于量化危险错误字段的指标的进步，其中包含所谓的“主导模式重叠”的度量中的理想MHD等离子体响应。然而，已知对复杂的撕裂层物理物理学的实验参数的这种或任何数量的缩放需要对数据库执行的回归，以历史原因不均匀地对现有的参数空间进行异样。本文介绍了现有的InternationalN = 1数据库和详细信息的分发，并详细介绍了ITER投影对简单最小二乘回归的敏感性。这里使用下采样和简单的内核密度估计加权回归来展示确认机器采样偏差的投影的差异。这导致对迄今为止建造的“通常”设备的参数更强大的投影。呈现了欧姆和供电等离子体中EF阈值的两个多器件和多参数缩放，将阈值投影到ITER并调查采样偏差的影响。

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