| EAST装置上W波段多道极向相关反射仪的研制 |
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| 引用本文： | 吴茗甫,文斐,向皓明,张涛,刘子奚,王嵎民,李恭顺,耿康宁,钟富彬,叶凯萱,黄佳,韩翔,张寿彪,高翔. EAST装置上W波段多道极向相关反射仪的研制[J]. 核聚变与等离子体物理, 2020, 40(3): 241-247. DOI: 10.16568/j.0254-6086.202003008 |
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| 作者姓名： | 吴茗甫 文斐 向皓明 张涛 刘子奚 王嵎民 李恭顺 耿康宁 钟富彬 叶凯萱 黄佳 韩翔 张寿彪 高翔 |
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| 作者单位： | (1. 中国科学技术大学核科学技术学院，合肥 230026；2. 中国科学院等离子体物理研究所，合肥 230031；3. 深圳大学新能源研究中心，深圳 518060；4. 深圳大学光电工程学院，光电子器件与系统教育部/广东省重点实验室，深圳 518060) |
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| 基金项目： | 国家重点研发计划;中国科学院合肥物质科学研究院院长基金;国家自然科学基金 |
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| 摘 要： | 在EAST装置上安装了X模极化W波段多道相关反射仪,用于测量等离子体芯部密度涨落。该诊断利用低损耗(<3dB)多工器将4个不同频率(79.2GHz,85.2GHz,91.8GHz和96GHz)的微波耦合在一起,通过同一个天线发射。反射波由两个极向分离(～5cm)的天线接收,通过下变频技术实现外差测量。通过对两个极向天线接收的信号进行相关分析,获得芯部湍流垂直速度。对2018年低约束模式(L模)放电进行分析发现,在电子回旋共振加热(ECRH)等离子体中,芯部湍流垂直速度在电子逆磁漂移方向。而在注入同向中性束(co-NBI)后,芯部湍流垂直速度变为离子逆磁漂移方向。
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| 关 键 词： | 相关反射仪 芯部湍流 密度涨落 湍流速度 |
| 收稿时间： | 2019-02-17 |
Development of a W-band multi-channel poloidal correlation reflectometry on EAST |
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| WU Ming-fu,WEN Fei,XIANG Hao-ming,ZHANG Tao,LIU Zi-xi,WANG Yu-ming,LI Gong-shun,GENG Kang-ning,ZHONG Fu-bin,YE Kai-xuan,HUANG Jia,HAN Xiang,ZHANG Shou-biao,GAO Xiang. Development of a W-band multi-channel poloidal correlation reflectometry on EAST[J]. Nuclear Fusion and Plasma Physics, 2020, 40(3): 241-247. DOI: 10.16568/j.0254-6086.202003008 |
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| Authors: | WU Ming-fu WEN Fei XIANG Hao-ming ZHANG Tao LIU Zi-xi WANG Yu-ming LI Gong-shun GENG Kang-ning ZHONG Fu-bin YE Kai-xuan HUANG Jia HAN Xiang ZHANG Shou-biao GAO Xiang |
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| Affiliation: | (1. University of Science and Technology of China, Hefei 230026;2. Institute of Plasma Physics, Chinese Academy of Science, Hefei 230031;3. Advanced Energy Research Center, Shenzhen University, Shenzhen 518060;4. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060) |
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| Abstract: | An X-mode polarized W-band multi-channel correlation reflectometry is installed on EAST tokamak for measuring the density fluctuations in the core of plasma. The diagnostic uses a low loss (<3dB) multiplexer to couple the microwaves of four different frequencies (79.2GHz, 85.2GHz, 91.8GHz and 96GHz) together and then transmit through the same antenna. The reflected wave is received by two antennas separated poloidally with about 5cm, and then heterodyne measurement is achieved by down-conversion technology. The turbulent vertical velocity in the core of plasma can be obtained by doing correlation analysis for the signals received by the two poloidal antennas. Analysis of the 2018 lower confinement mode (L-mode) discharge shows that in plasma heated by the electron cyclotron resonance heating (ECRH), the vertical velocity of the core turbulence is in the direction of the electron diamagnetic drift. The vertical velocity of the core turbulence becomes in the direction of the ion diamagnetic drift after injecting the co-neutral beam. |
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| Keywords: | Correlation reflectometry Core turbulence Density fluctuation Turbulence velocity |
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