Shen Y Q, Yang Z C, Zhong W L, Jiang M, Shi Z B, Santos J, Shi P W, Tong R H, Xue G Q, Zhou Y, Wen J, Yu X, Deng W C, Wang S, Yang Z J, Chen Z Y, Li D, Zha X Q, Jin Z Y, Xu X, Xu M
Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
Associação EURATOM/IST, Instituto de Plasmas e Fusão Nuclear-Laboratório Associado, Instituto Superior Técnico, 1049-001 Lisboa, Portugal.
Rev Sci Instrum. 2023 Jun 1;94(6). doi: 10.1063/5.0140390.
Plasma Position Reflectometry (PPR) is planned to provide plasma position and shape information for plasma operation in future fusion reactors. Its primary function is to calibrate the drift of the magnetic signals due to the integral nature of magnetic measurement. Here, we attempt to measure plasma position using ordinary mode (O-mode) and extraordinary mode (X-mode) reflectometry systems on two tokamaks. A new physical model based on the phase shift is proposed to deduce the relative movement of the cut-off layer without density inversion. We demonstrate the plasma position measurements by absolute measurement from density profile inversion and relative measurement from phase shift. The combination of X-mode and O-mode reflectometers can minimize the limitations of single polarization reflectometry and further increase the accuracy of plasma position measurement. These results could provide an important technical basis for the further development of a real-time control system based on PPR.
等离子体位置反射测量法（PPR）计划为未来聚变反应堆中的等离子体运行提供等离子体位置和形状信息。其主要功能是校准由于磁测量的积分性质而导致的磁信号漂移。在此，我们尝试在两个托卡马克装置上使用普通模式（O 模式）和异常模式（X 模式）反射测量系统来测量等离子体位置。提出了一种基于相移的新物理模型，以推断无密度反转情况下截止层的相对移动。我们通过密度剖面反演的绝对测量和相移的相对测量来演示等离子体位置测量。X 模式和 O 模式反射计的组合可以最大限度地减少单偏振反射测量的局限性，并进一步提高等离子体位置测量的精度。这些结果可为基于 PPR 的实时控制系统的进一步发展提供重要的技术基础。
