Abstract

Heavy ion beam probe (HIBP) is a unique plasma diagnostics that makes it possible to measure the electric potential φ of high-temperature plasma and its fluctuations \(\tilde {\varphi }\), as well as the density \({{\tilde {n}}_{e}}\) and poloidal magnetic field \({{\tilde {B}}_{{{\text{pol}}}}}\) fluctuations. Position of the point of performing measurements in the plasma vertical cross-section depends on the beam energy and angle of its entrance into the plasma. The variation of these two parameters makes it possible to construct a two-dimensional (2D) detector grid, which covers the domain of possible measurements. The measurement results obtained in the detector grid points provide for constructing 2D distributions of plasma parameters. For the OH and ECRH stages of the T-10 tokamak shots, 2D distributions of the plasma electric potential are presented for the regime with the on-axis magnetic field of B_t = 2.2 T, plasma current of I_pl = 230 kA, line-average density of \({{\bar {n}}_{e}}\)≈ 1.1 × 10¹⁹ m^–3 and off-axis ECRH power of P_ECRH = 1.7 MW.

中文翻译：

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T-10 托卡马克中等离子体电势的二维分布

摘要

重离子束探针 (HIBP) 是一种独特的等离子体诊断技术，可以测量高温等离子体的电势 φ 及其波动\(\tilde {\varphi }\)以及密度\({{ \tilde {n}}_{e}}\)和极向磁场\({{\tilde {B}}_{{{\text{pol}}}}}\)波动。等离子体垂直截面中执行测量的点的位置取决于束能量和其进入等离子体的角度。这两个参数的变化使得构建二维 (2D) 探测器网格成为可能，该网格覆盖了可能的测量范围。在探测器网格点中获得的测量结果用于构建等离子体参数的二维分布。对于 T-10 托卡马克发射的 OH 和 ECRH 阶段，给出了轴上磁场B _t = 2.2 T、等离子体电流I _pl = 230 kA 的等离子体电势的二维分布，线- 平均密度\({{\bar {n}}_{e}}\) ≈ 1.1 × 10 ¹⁹ m ^–3且离轴 ECRH 功率P _ECRH = 1.7 MW。