高速CCD诊断MHD不稳定性的初步研究

Preliminary Study of the High-Speed CCD Diagnosis on MHD Instability

电荷耦合器件(CCD)作为一种高灵敏度的二维辐射测量传感器,具有使用方便,测量结果可视性好等特点,近年来在托卡马克等离子体研究中得到广泛的应用.在HT-7和EAST托卡马克装置上建立了高速CCD成像诊断系统,并利用其进行磁流体力学(MHD)不稳定性研究.利用高速CCD成功观测到HT-7托卡马克上的锯齿振荡不稳定性和Mirnov振荡行为,以及EAST托卡马克H-mode过程中的边界局域模(ELM)行为,为进一步利用高速CCD诊断技术开展MHD不稳性时空过程的研究奠定了基础.

Charge-coupled device （CCD） is widely used in Tokamak in recent years to measure the two dimensional radiations from plasmas owing to its sensitivity, easy to use and good data visualization. A high speed CCD diagnosis system has been set up and used to diagnose the MHD （magnetohydrodynamics） instabilitiy in HT-7 and EAST Tokamaks. Sawtooth and Mirnov oscillations in HT-7 Tokamak and ELM （edge-localized modes） process in EAST H-mode discharges are measured by CCD. The primary experimental results provide the base for further space and time evolution study of MHD instability by using high-speed CCD diagnosis.