HL-3装置上离子回旋波加热对中子产额的影响  

Influence of ion cyclotron range of frequencies heating on neutron emission rate in HL-3 tokamak

作　　者：杨冠铭 郝广周 卢凌峰 董冠岐 郝保龙 王硕[1] YANG Guanming;HAO Guangzhou;LU Lingfeng;DONG Guanqi;HAO Baolong;WANG Shuo(Southwestern Institute of Physics,Chengdu 610041,China)

机构地区：[1]核工业西南物理研究院,成都610041

出　　处：《核技术》2024年第5期1-13,共13页Nuclear Techniques

基　　金：国家磁约束核聚变能发展研究专项(No.2022YFE03060002,No.2022YFE03090002);中核集团基础研究项目(No.CNNC-JCYJ-202236);四川省青年科技创新研究团队项目(No.2022JDTD0003)资助。

摘　　要：离子回旋射频(Ion Cyclotron Range of Frequencies,ICRF)波加热是托卡马克装置上至关重要的辅助加热方式之一。托卡马克装置中国环流三号(HL-3,原名HL-2M)拟安装加热功率为6 MW的ICRF加热系统。本工作利用TRANSP程序,模拟并研究了ICRF加热的频率和功率对聚变中子产额以及快离子分布的影响。研究结果表明:ICRF的频率和功率对中子产额有显著影响,固定ICRF频率时,中子产额与加热功率成正比关系,而在固定ICRF加热功率的情况下,中子产额的增加幅度显著依赖ICRF的频率,在研究参数范围内,30 MHz的ICRF对中子产额的增加具有最显著的增强作用。快离子分布的模拟结果显示,在考虑ICRF加热后,中性束和ICRF的协同加热机制能够将快离子加热至最高1 MeV,有效地提高了中子产额。此外,基于中子相机诊断的概念对中子信号进行了仿真。结果表明,中子相机能够有效地测量到由ICRF加热导致的中子产额高低和分布剖面的变化,这为将来优化中子相机诊断系统设计和测量中子空间分布提供了一定的参考。[Background]Ion cyclotron range of frequencies(ICRF)heating is one of the most widely used auxiliary heating methods in tokamaks.The HL-3 tokamak plans to equip a 6 MW ICRF heating system to conduct discharge experiments of high-performance plasma.[Purpose]This study optimizes the parameters of ICRF using numerical simulations with the purpose of supporting the reactor-level plasma in HL-3 in future.[Methods]On the basis of NBI heating in the HL-3 device,ICRF heating was considered,and the TRANSP code was employed to explore the influence of ICRF frequency and power in HL-3 on the neutron emission rate,as well as the distribution of fast ions.The ICRF frequency range was between 25 MHz and 40 MHz,and the ICRF power range was between 1 MW and 6 MW.The neutron signals based on the concept of neutron camera diagnosis were also simulated.[Results]The simulation results show that the ICRF frequency and power significantly influence the neutron emission rate.The neutron emission rate is directly proportional to the ICRF heating power at a fixed ICRF frequency whilst the increase in the neutron emission rate significantly depends on the ICRF frequency when the ICRF heating power is fixed.Among the investigated parameters,the ICRF with a frequency of 30 MHz yields the maximum increase in the neutron emission rate.The simulation results of fast ions demonstrate that the synergetic heating of neutral beam injection and ICRF can heat fast ions up to 1 MeV after considering ICRF heating,which effectively increases the neutron emission rate.The simulation results of neutron camera indicate that neutron camera can effectively measure the changes in neutron emission rate and distribution profile caused by ICRF heating.[Conclusions]The simulation results demonstrate that the appropriate selection of the ICRF frequency and power can effectively increase the neutron emission rate in HL-3 experiments,the optimal combination of ICRF frequency/power is 30 MHz/6 MW for the scenario analyzed in this study.The simulation of neutron came

关 键 词：离子回旋波 聚变中子 快离子 HL-3装置 

分 类 号：TL612.11[核科学技术—核技术及应用] TL631.24