A new Q-band comb-based multi-channel microwave Doppler backward scattering diagnostic developed on the HL-3 tokamak  

作　　者：Ruihai TONG Yu ZHOU Wulyu ZHONG Jie WEN Zhongbing SHI Xiaolan ZOU Anshu LIANG Zengchen YANG Min JIANG Xin YU Yuqi SHEN 佟瑞海;周宇;钟武律;闻杰;石中兵;邹晓岚;梁桉树;杨曾辰;蒋敏;余鑫;沈宇奇(Southwestern Institute of Physics,Chengdu 610041,People’s Republic of China;Department of Engineering Physics,Tsinghua University,Beijing 100084,People’s Republic of China;CEA,IRFM,Saint-Paul-lez-Durance 13108,France)

机构地区：[1]Southwestern Institute of Physics,Chengdu 610041,People’s Republic of China [2]Department of Engineering Physics,Tsinghua University,Beijing 100084,People’s Republic of China [3]CEA,IRFM,Saint-Paul-lez-Durance 13108,France

出　　处：《Plasma Science and Technology》2025年第1期23-29,共7页等离子体科学和技术(英文版)

基　　金：supported by National Natural Science Foundation of China(Nos.12105087,12275096,and 11922503);the Joint Funds of the National Natural Science Foundation of China(No.U21A20440);the Science and Technology Planning Project of Sichuan Province(No.2023YFG0139)。

摘　　要：The Doppler backscattering(DBS)diagnostic is widely used to measure the localized density fluctuations and the propagation velocity of turbulent structures.Microwave is launched at a frequency that approaches a cutoff layer in the plasma at an angle oblique to the cutoff layer.A new Q-band multichannel DBS system based on a comb generator has been designed and tested for application on the HL-3 tokamak.With the comb generator and heterodyne scheme,the stability and flexibility of the new DBS system are improved.The new DBS diagnostic has a high output power(~10 dBm),good power flatness(<5 dB in Q-band),and frequency stability,and the inter-frequency separation is tunable remotely.This article introduces the system design,laboratory test results,and initial experimental results from the HL-3 tokamak.With the help of the newly developed multichannel DBS,the turbulence information can be studied with high temporal and spatial resolution.

关 键 词：Doppler backscattering(DBS) microwave diagnostic turbulence TOKAMAK 

分 类 号：TL631.24[核科学技术—核技术及应用]