A novel multi-channel quadrature Doppler backward scattering reflectometer on the HL-2A tokamak

作者：Shi, Zhongbing^*; Zhong, Wulu; Jiang, Min; Yang, Zengchen; Zhang, Boyu; Shi, Peiwan; Chen, Wei; Wen, Jie; Chen, Chengyuan; Fu, Bingzhong; Liu, Zetian; Ding, Xuantong; Yang, Qingwei; Duan, Xuru

来源：Review of Scientific Instruments, 2016, 87(11): 113501.

DOI：10.1063/1.4966680

• PROFILE MEASUREMENTS
• TORE-SUPRA
• BACKSCATTERING
• VELOCITY
• PLASMAS
• TRANSITION
• ROTATION
• SHEAR
• BEAM
• MODE

A novel 16-channel fixed frequency Doppler backward scattering (DBS) reflectometer system has been developed on the HL-2A tokamak. This system is based on the filter-based feedback loop microwave source (FFLMS) technique, which has lower phase noise and lower power variation compared with present tunable frequency generation and comb frequency array generation techniques [J. C. Hillesheim et al. Rev. Sci. Instrum. 80, 083507 (2009) and W. A. Peebles et al. Rev. Sci. Instrum. 81, 10D902 (2010)]. The 16-channel DBS system is comprised of four x four-frequency microwave transmitters and direct quadrature demodulation receivers. The working frequencies are 17-24 GHz and 31-38 GHz with the frequency interval of 1 GHz. They are designed to measure the localized intermediate wave-number (k(perpendicular to)rho similar to 1-2, k(perpendicular to) similar to 2-9 cm(-1)) density fluctuations and the poloidal rotation velocity profile of turbulence. The details of the system design and laboratory tests are presented. Preliminary results of Doppler spectra measured by the multi-channel DBS reflectometer systems are obtained. The plasma rotation and turbulence distribution during supersonic molecular beam injection are analyzed. Published by AIP Publishing.

• 出版日期2016-11
• 单位核工业西南物理研究院; 西华大学