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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 charge-discharge 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.
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Keywords:
- Langmuir probe /
- supercapacitor /
- magnetic confinement fusion plasma /
- tokamak
[1] Johnson E O, Malter L 1950 Phys. Rev. 80 58
Google Scholar
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[4] Yan L W, Hong W Y, Qian J, Luo C W, Pan L 2005 Rev. Sci. Instrum. 76 093506
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[10] Buchenauer D, Hsu W L, Smith J P, Hill D N 1990 Rev. Sci. Instrum. 61 2873
Google Scholar
[11] Liu S C, Liao L, Wei W Y, Liang Y, Xu J C, Cao L, Li S, Li L, Meng L Y, Qian J P, Zang Q, Wang L, Xu S, Cai J, Yan N, Ma Q, Zhao N, Chen R, Hu G H, Liu J B, Liu X J, Ming T F, Li L T, Sun Y, Zeng L, Li G Q, Yao D M, Xu G S, Gong X Z, Gao X, EAST Team 2022 Fusion. Eng. Des. 180 113162
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图 3 电容充放电控制软件的设置界面
Fig. 3. Setting interface of the capacitor charge-discharge control software.
图 4 电容充放电控制软件的运行界面
Fig. 4. Operating interface of capacitor charge-discharge control software.
图 5 电容充放电控制软件的电源设置界面
Fig. 5. Power supply setting interface of capacitor charge-discharge control software.
图 8 电容器充电曲线, 其中通道1—32, 使用1台直流电源同时为4台电容器充电; 通道33—35, 使用1台直流电源为3台电容器充电
Fig. 8. Charge curve of capacitor. Note that one power supply is used to charge four capacitors for channel 1–32, and one power supply is used to charge three capacitors for channel 33–35.
图 11 EAST长脉冲放电过程中(a)等离子体电流、探针 (b)偏压和 (c)离子饱和流随时间演化
Fig. 11. Temporal evolution of (a) plasma current, (b) biasing voltage and (c) ion saturation current of limiter probe during a long-pulse discharge on EAST.
图 12 限制器探针的离子饱和流测量电路
Fig. 12. Electrical circuit for ion saturation current measurement of limiter probe.
图 13 #106532次放电的限制器探针工作状态分布图
Fig. 13. Circuit setup of limiter probe array for discharge #106532.
图 14 #106532次放电低杂波注入功率与限制器探针测量参数随时间演化 (a) 2.45 GHz (黑色)与4.6 GHz (红色)低杂波注入功率, 超声分子束注入信号(橘黄色); (b)限制器探针左侧离子饱和流分布; (c)右侧离子饱和流分布; (d)左侧悬浮电位分布; (e)右侧悬浮电位分布
Fig. 14. Temporal evolutions of LHW power and SOL parameters measured by limiter probe are presented as follows: (a) LHW heating power of 2.45 GHz antenna (black) and 4.6 GHz antenna (red), along with the SMBI signal (orange); (b) distribution of ion saturation current of the limiter probe on the left side; (c) distribution of ion saturation current on the right side; (d) distribution of floating potential on the left side; (e) distribution of floating potential on the right side.
图 15 #106532次放电低杂波注入功率与限制器探针测量参数随时间演化 (a) 2.45 GHz (黑色)与4.6 GHz (红色)低杂波注入功率, 超声分子束注入信号(橘黄色); 限制器探针测量的(b)电子温度、(c)电子密度、(d)粒子通量和(e)热通量, 其中蓝色线条代表第14号探针(位于限制器左侧阵列中部), 红色线条代表第40号探针(位于限制器右侧阵列中部)
Fig. 15. Temporal evolution of LHW power and SOL parameters measured by limiter probe are presented as follows: (a) LHW power of 2.45 GHz antenna (black) and 4.6 GHz antenna (red), along with the SMBI signal (orange); (b) electron temperature; (c) electron density; (d) particle flow; (e) heat flow. The blue lines represent channel 14 (in the left array of the limiter, near the midplane), and the red lines represent channel 40 (in the right array of the limiter, near the midplane).
表 1 超级电容器充放电电路4种模式下继电器开关的状态组合
Table 1. State combinations of relay switches in four modes of supercapacitor charging and discharging circuits.
电路模式 S1 S2 S3 S4 S5 S6 充电 闭合 闭合 闭合 断开 断开 断开 工作输出 断开 断开 断开 断开 闭合 闭合 电容放电 断开 断开 闭合 闭合 断开 断开 关断 断开 断开 断开 断开 断开 断开 
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[1] Johnson E O, Malter L 1950 Phys. Rev. 80 58
Google Scholar
[2] Perkins R J, Hosea J C, Taylor G, Bertelli N, Kramer G J, Luo Z P, Qin C M, Wang L, Xu J C, Zhang X J 2019 Plasma. Phys. Contr. F 61 045011
Google Scholar
[3] Wang F M, Gan K F, Gong X Z, Team E 2013 Plasma Sci. Technol. 15 225
Google Scholar
[4] Yan L W, Hong W Y, Qian J, Luo C W, Pan L 2005 Rev. Sci. Instrum. 76 093506
Google Scholar
[5] Ming T F, Zhang W, Chang J F, Wang J, Xu G S, Ding S, Yan N, Gao X, Guo H Y 2009 Fusion. Eng. Des. 84 57
Google Scholar
[6] Xu J C, Wang L, Xu G S, Luo G N, Yao D M, Li Q, Cao L, Chen L, Zhang W, Liu S C, Wang H Q, Jia M N, Feng W, Deng G Z, Hu L Q, Wan B N, Li J, Sun Y W, Guo H Y 2016 Rev. Sci. Instrum. 87 083504
Google Scholar
[7] Yang J, Chen Z P, Liu H, Wang T, Zhu M C, Song Z, Wang Z, Zhuang G, Ding Y, Team J T 2019 Plasma Sci. Technol. 21 105105
Google Scholar
[8] Labombard B, Lipschultz B 1986 Rev. Sci. Instrum. 57 2415
Google Scholar
[9] Asakura N, Shimizu K, Hosogane N, Itami K, Tsuji S, Shimada M 1995 Nucl. Fusion 35 381
Google Scholar
[10] Buchenauer D, Hsu W L, Smith J P, Hill D N 1990 Rev. Sci. Instrum. 61 2873
Google Scholar
[11] Liu S C, Liao L, Wei W Y, Liang Y, Xu J C, Cao L, Li S, Li L, Meng L Y, Qian J P, Zang Q, Wang L, Xu S, Cai J, Yan N, Ma Q, Zhao N, Chen R, Hu G H, Liu J B, Liu X J, Ming T F, Li L T, Sun Y, Zeng L, Li G Q, Yao D M, Xu G S, Gong X Z, Gao X, EAST Team 2022 Fusion. Eng. Des. 180 113162
Google Scholar
[12] Demidov V I, Ratynskaia S V, Rypdal K 2002 Rev. Sci. Instrum. 73 3409
Google Scholar
[13] 李永春, 丁伯江, 李妙辉, 王茂, 刘亮, 吴陈斌, 阎广厚 2022 核电子学与探测技术 42 116
Google Scholar
Li Y C, Ding B J, Li M H, Wang M, Liu L, Wu C B, Yan G H 2022 Nucl. Electron. Detect. Technol. 42 116
Google Scholar
[14] Back R, Bengtson R D 1997 Rev. Sci. Instrum. 68 377
Google Scholar
[15] Yan N, Naulin V, Xu G S, Rasmussen J J, Wang H Q, Liu S C, Wang L, Liang Y, Nielsen A H, Madsen J, Guo H Y, Wan B N 2014 Plasma Phys. Contr. F 56 095023
Google Scholar
[16] Myra J R, Lau C, Van Compernolle B, Vincena S, Wright J C 2020 Phys. Plasmas 27 072506
Google Scholar
[17] Xu G S, Wan B N, Zhang W 2006 Rev. Sci. Instrum. 77 063505
Google Scholar
[18] Myra J R 2021 J. Plasm. Phys. 87 1
Google Scholar
[19] Liu P, Xu G S, Wang H Q, Jiang M, Wang L, Zhang W, Liu S C, Yan N, Ding S Y 2013 Plasma Sci. Technol. 15 619
Google Scholar
[20] Colas L, Urbanczyk G, Goniche M, Hillairet J, Bernard J M, Bourdelle C, Fedorczak N, Guillemaut C, Helou W, Bobkov V, Ochoukov R, Jacquet P, Lerche E, Zhang X, Qin C, Klepper C C, Lau C, Van Compernolle B, Wukitch S J, Lin Y, Ono M, Contributors J, Team A U, Team E, Team W, Ios I 2022 Nucl. Fusion 62 016014
Google Scholar
[21] Ochoukov R, Whyte D G, Brunner D, D'Ippolito D A, LaBombard B, Lipschultz B, Myra J R, Terry J L, Wukitch S J 2014 Aip. Conf. Proc. 1580 267
Google Scholar
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