摘要
EAST限制器探针安装在低场侧限制器,在环向上共有两个阵列,可以同时工作在悬浮电位测量、离子饱和流测量和扫描单探针模式.当朗缪尔静电探针运行在离子饱和流测量模式时,需要为其提供稳定的偏压.本文采用大容量电容器为探针提供偏压,相比于其他磁约束聚变装置上使用的9 V干电池组,大容量电容器具有电压设置灵活、易于维护和环保等优点.为此,研发和测试了整套超级电容器的充放电控制电路.本文还基于Python语言开发了超级电容器充放电控制电路的控制软件,通过该软件可以实现对电路的远程控制和自动控制.经实验测试,电容器充放电控制电路可以在长脉冲放电条件下为探针输出稳定的偏压,适用于磁约束聚变的复杂电磁环境.通过将超级电容器充放电控制电路应用于EAST限制器探针诊断,测量了2.45 GHz和4.6 GHz两种低杂波加热条件下刮削层等离子体离子饱和流、悬浮电位、电子温度和密度等特征参数的三维分布,发现2.45 GHz低杂波加热时刮削层电子密度较高,而双波协同加热时刮削层电子密度最高.这一系列测试与物理实验充分验证了超级电容器充放电控制电路的可靠性和稳定性.
The EAST limiter probe is installed on the front surface of guard limiter,which consists of two columns and can operate in floating potential mode,ion saturation current mode,and swept single-probe mode simultaneously.When Langmuir probe operates in the ion saturation current mode,it requires a stable biasing voltage.To meet this requirement,a large capacitor is used to provide a biasing voltage for the probe.Comparing with the 9 V dry batteries that are commonly used in magnetic confinement fusion devices,employing a large capacitor offers advantages such as flexible voltage adjustment,easy maintenance,and environmental friendliness.Therefore,we have designed and tested a complete set of supercapacitor chargedischarge control circuitry.In this work,a control software is developed for the supercapacitor charge-discharge control circuitry based on the Python language to enable the remote and automatic controlling of the circuitry operation.As demonstrated in experiments,the capacitor charge-discharge control circuitry can supply stable biasing voltage output for the probe under long-pulse discharge,and it is workable in complex electromagnetic environment of magnetic confinement fusion device.By implementing the supercapacitor charge-discharge control circuitry in EAST limiter probe diagnostics,the three-dimensional distributions of plasma parameters are measured,such as ion saturation current,floating potential,electron temperature,and plasma density.In a lower hybrid wave(LHW)heating experiment,the 2.45 GHz LHW is found to generate larger electron density than the 4.6 GHz LHW,and the largest electron density appears when both the 2.45 GHz and 4.6 GHz LHWs are turned on simultaneously.These experimental results confirm that supercapacitor charge-discharge control circuitry can be operated reliably and stably.
作者
张问博
刘少承
廖亮
魏文崟
李乐天
王亮
颜宁
钱金平
臧庆
Zhang Wen-Bo;Liu Shao-Cheng;Liao Liang;Wei Wen-Yin;Li Le-Tian;Wang Liang;Yan Ning;Qian Jin-Ping;Zang Qing(Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;Science Island Branch of Graduate School,University of Science and Technology of China,Hefei 230026,China)
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2024年第6期258-269,共12页
Acta Physica Sinica
基金
国家磁约束聚变能重点研发专项(批准号:2019YFE03040000)
国家自然科学基金(批准号:12275310,12275312)
中国科学院等离子体物理研究所基金(批准号:DSJJ-2021-01)、中国科学院合肥大科学中心协同创新基金(批准号:2021HSC-CIP019)和中国科学院合肥大科学中心高端用户基金(批准号:2021HSC-UE014,2021HSC-UE012)资助的课题。
