Numerical investigation on electron cyclotron stray radiation
 under hybrid operation scenarios of tokamak

doi:10.16568/j.0254-6086.202303013

Nuclear Fusion and Plasma Physics ›› 2023, Vol. 43 ›› Issue (3): 332-339.DOI: 10.16568/j.0254-6086.202303013

• Plasma Physics • Previous Articles Next Articles

Numerical investigation on electron cyclotron stray radiation under hybrid operation scenarios of tokamak

JIANG Xin-chen1 , ZHENG Ping-wei1, 2, GONG Xue-yu2 , DENG Sheng2 , LI Chun-yan1 , SHI Mei-lin1 , YAO Shao-lin1

(1. School of Resources & Environment and Safety Engineering, University of South China, Hengyang 421001; 2. School of Nuclear Science and Technology, University of South China, Hengyang 421001)

Received:2021-09-10 Revised:2023-05-09 Online:2023-09-15 Published:2023-09-04

托卡马克混合运行模式下电子回旋波杂散辐射数值模拟

姜欣辰 1 ，郑平卫*1, 2，龚学余 2 ，邓盛 2 ，李春艳 1 ，石梅玲 1 ，姚少林 1

(1. 南华大学资源环境与安全工程学院，衡阳 421001； 2. 南华大学核科学技术学院，衡阳 421001)

作者简介:姜欣辰(1995−)，男，湖南衡阳人，硕士研究生，主要从事射频波加热与电流驱动研究。
基金资助:
国家自然科学基金(12075114)；湖南省自然科学基金(2018JJ2320)；湖南省教育厅优秀青年项目(19B483)；湖南省核聚变国际科技创新合作基地(2018WK4009)

Abstract

Abstract:

Imperfect absorption of electron cyclotron (EC) wave power in plasma results in stray radiation during plasma heating and current drive. Numerical investigations on EC stray radiation are performed under three hybrid operation scenarios of HL-2M tokamak. Scanning the toroidal and poloidal incident angles of 105GHz EC wave launched from low field side of mid-plane, the simulation is conducted by using TORAY-GA code. The standard to effective avoidance of stray radiation, as the absorption fraction of EC power satisfying η>η _c, is adopted. It is found that incident angle is one of the key factors that affect stray radiation caused by incomplete absorption of EC power. For two scenarios with n_e1= 4.6× 10 ¹⁹m^{− 3}、 T_e1 = 7.41keV 、 I _p1=1MA 和 n _e2= 5× 10 ¹⁹m^{− 3} 、 T_e2 = 6.95keV 、 I _p2=1MA ,the range of EC incident angle that can effectively avoid stray radiation exceeds the design. In these cases, the stray radiation can be ignored during heating and current drive. For the scenario with n _e3= 6.5× 10 ¹⁹m^{− 3} 、 T _e3= 6.62keV 、 I_p3 = 0.95MA, a large part of the designed incident angle will make EC wave have a very low wave power absorption fraction, special attention should be paid to the stray radiation. Electron density is another key factor. The influence of electron temperature is very small and can be ignored.

Key words: Stray radiation, Electron cyclotron wave, Heating and current drive, HL-2M tokamak

摘要：

电子回旋波(EC 波)在等离子体加热与电流驱动过程中未被等离子体完全吸收时将会产生杂散辐射。在 HL-2M 托卡马克三种混合运行模式参数条件下，利用 TORAY-GA 程序扫描 105GHz EC 波中平面发射时的环向和极向发射角，以 EC波功率吸收份额η >ηc ( ηc= 95% )作为判断能有效避免杂散辐射的标准，开展 EC 波功率吸收数值模拟。研究发现发射角是影响 EC波不完全吸收造成杂散辐射的关键因素之一。在 n_e1= 4.6× 10 ¹⁹m^{− 3}、 T_e1 = 7.41keV 、

I _p1=1MA 和 n _e2= 5× 10 ¹⁹m^{− 3} 、 T_e2 = 6.95keV 、 I _p2=1MA 的参数条件下，能够有效避免杂散辐射的 EC 波发射角超过设计范围，在设计发射角范围内调节 EC 波发射角进行加热和电流驱动时可以忽略杂散辐射的影响。当参数为 n _e3= 6.5× 10 ¹⁹m^{− 3} 、 T _e3= 6.62keV 、 I_p3 = 0.95MA ，设计发射角度范围中有一大部分会使得 EC 波有非常低的波功率吸收份额，需要特别注意杂散辐射。除发射角度外，电子密度是影响杂散辐射的另一个关键因素，电子温度影响非常小，可以忽略不计。

关键词: 杂散辐射, 电子回旋波, 加热与电流驱动, HL-2M 托卡马克

CLC Number:

TL62+ 4

JIANG Xin-chen , ZHENG Ping-wei, GONG Xue-yu , DENG Sheng , LI Chun-yan , SHI Mei-lin , YAO Shao-lin. Numerical investigation on electron cyclotron stray radiation under hybrid operation scenarios of tokamak[J]. Nuclear Fusion and Plasma Physics, 2023, 43(3): 332-339.

姜欣辰, 郑平卫, 龚学余, 邓盛, 李春艳, 石梅玲, 姚少林 . 托卡马克混合运行模式下电子回旋波杂散辐射数值模拟[J]. 核工业西南物理研究院, 2023, 43(3): 332-339.

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Numerical investigation on electron cyclotron stray radiation under hybrid operation scenarios of tokamak

托卡马克混合运行模式下电子回旋波杂散辐射数值模拟

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