A novel multi-channel quadrature Doppler backward scattering reflectometer on the HL-2A tokamak
| Autor: | Xuantong Ding, Z.C. Yang, Min Jiang, Wei Chen, C. Y. Chen, Xuru Duan, Wulu Zhong, Z. T. Liu, Zhongbing Shi, P.W. Shi, Boyu Zhang, Qingwei Yang, Jie Wen, Bingzhong Fu |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Review of Scientific Instruments. 87:113501 |
| ISSN: | 1089-7623 0034-6748 |
| DOI: | 10.1063/1.4966680 |
| Popis: | 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 × 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⊥ρ ∼ 1-2, k⊥ ∼ 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. |
| Databáze: | OpenAIRE |
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