用于在MAST上诊断和控制新经典撕裂模的现场可编程门阵列单元。

A field programmable gate array unit for the diagnosis and control of neoclassical tearing modes on MAST.

作者信息

O'Gorman T, Naylor G, Gibson K J, Huang B, McArdle G J, Scannell R, Shibaev S, Snape J A, Thomas-Davies N

机构信息

York Plasma Institute, Department of Physics, University of York, York, United Kingdom.

出版信息

Rev Sci Instrum. 2012 Oct;83(10):10E312. doi: 10.1063/1.4732057.

DOI:10.1063/1.4732057

PMID:23126972

Abstract

A real-time system has been developed to trigger both the MAST Thomson scattering (TS) system and the plasma control system on the phase and amplitude of neoclassical tearing modes (NTMs), extending the capabilities of the original system. This triggering system determines the phase and amplitude of a given NTM using magnetic coils at different toroidal locations. Real-time processing of the raw magnetic data occurs on a low cost field programmable gate array (FPGA) based unit which permits triggering of the TS lasers on specific amplitudes and phases of NTM evolution. The MAST plasma control system can receive a separate trigger from the FPGA unit that initiates a vertical shift of the MAST magnetic axis. Such shifts have fully removed m∕n = 2∕1 NTMs instabilities on a number of MAST discharges.

摘要

已经开发了一种实时系统，用于根据新经典撕裂模（NTM）的相位和幅度触发MAST汤姆逊散射（TS）系统和等离子体控制系统，扩展了原始系统的功能。该触发系统使用位于不同环形位置的磁线圈来确定给定NTM的相位和幅度。原始磁数据的实时处理在基于低成本现场可编程门阵列（FPGA）的单元上进行，该单元允许在NTM演化的特定幅度和相位触发TS激光器。MAST等离子体控制系统可以从FPGA单元接收单独的触发信号，从而启动MAST磁轴的垂直位移。这种位移已在许多MAST放电中完全消除了m∕n = 2∕1 NTM的不稳定性。