【作者】 庄明； 胡良兵； 冯汉升； 张启勇； 袁春燕；

【Author】 ZHUANG Ming,HU Liang-bing,FENG Han-sheng, ZHANG Qi-yong,YUAN Chun-yan (Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China)

【机构】 中科院等离子体物理研究所低温工程与技术研究室；

【摘要】 EAST(Experimental Advanced Superconductive Tokamak)是世界上第一个全超导托卡马克核聚变实验装置。其纵场和极向场线圈均采用NbTi/Cu复合材料的CIC(Cable in Conduit)导体。EAST需要冷却的低温部件除纵场和极向场线圈外,还有纵场线圈盒、电流引线、超导传输线、磁体支撑以及热辐射屏等。氦低温系统负责给冷质部件供冷,其安全、稳定运行是EAST物理实验顺利进行的前提,自2006年2月份首次工程调试以来,已经顺利的保证了五轮实验运行。EAST在第五轮物理实验中,实现了中心电子温度大于1500万度、拉长比为1.9的条件下,稳定重复的60s非圆截面双零偏滤器位形等离子体放电。本文对前五轮实验低温系统的运行状况进行了分析,对于进一步提高低温系统的稳定性,保证未来高参数物理实验的顺利进行具有重要意义。更多还原

【Abstract】 EAST(Experimental Advanced Superconductive Tokamak) is the first fully superconductive Tokamak fusion experimental devices in the world.The CIC(cable in conduit) type toroidal field(TF) and poloidal field(PF) coils are made of NbTi/Cu hybrid materials.The main EAST cryogenic users are TF and PF coils,their current leads,the superconducting (SC) buslines,the magnet support structures,and thermal shields.EAST cryogenic system is responsible for supplying supercritical helium and cold helium to cold components,the safe and steady operation of which is an essential condition for successful physics experiments.Since the first commissioning in February 2006,it was cooled down for five plasma physics experimental campaigns.In the fifth experiment,stable and repeatable 60 seconds plasma discharge were achieved with D-shape cross-section and double null divertor configuration under the condition that the temperature of central electrons is 15 million degrees celsius and elongation ratio is 1.9.This paper presents the operating behavior of the cryogenic system in the past 5 experiments.This analysis is helpful for increasing the stability of the cryogenic system,and also with further purpose to guarantee the success of the long plasma duration experiments in future.更多还原