An eight-channel Doppler backscattering system in the experimental advanced superconducting tokamak

Hu, J. Q.; Zhou, C.; Liu, A. D.; Wang, M. Y.; Doyle, E. J.; Peebles, W. A.; Wang, G.; Zhang, X. H.; Zhang, J.; Feng, X.; Ji, J. X.; Li, H.; Lan, T.; Xie, J. L.; Ding, W. X.; Liu, W. D.; Yu, C. X.

doi:10.1063/1.4991855

An eight-channel Doppler backscattering system in the experimental advanced superconducting tokamak

Journal Article · Fri Jul 14 00:00:00 EDT 2017 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4991855· OSTI ID:1535325

Hu, J. Q. ^[1]; Zhou, C. ^[2]; Liu, A. D. ^[2]; Wang, M. Y. ^[2]; Doyle, E. J. ^[3]; Peebles, W. A. ^[3]; Wang, G. ^[3]; Zhang, X. H. ^[4]; Zhang, J. ^[2]; Feng, X. ^[2]; Ji, J. X. ^[2]; Li, H. ^[2]; ^[2]; Xie, J. L. ^[2]; Ding, W. X. ^[5]; ^[2]; Yu, C. X. ^[2]

Univ. of Science and Technology of China, Hefei (China); DOE/OSTI
Univ. of Science and Technology of China, Hefei (China)
Univ. of California, Los Angeles, CA (United States)
Hefei Univ. of Technology (China)
Univ. of Science and Technology of China, Hefei (China); Univ. of California, Los Angeles, CA (United States)

Doppler backscattering system can measure the perpendicular velocity and fluctuation amplitude of the density turbulence with intermediate wavenumber. An eight-channel Doppler backscattering system has been installed in the Experimental Advanced Superconducting Tokamak (EAST), which can probe eight different radial locations simultaneously by launching eight fixed frequencies (55, 57.5, 60, 62.5, 67.5, 70, 72.5, 75 GHz) into plasma. The quasi-optical system consists of circular corrugated waveguide transmission, a fixed parabolic mirror, and a rotatable parabolic mirror which are integrated with quasi-optics front-end of the profile reflectometer inside the vacuum vessel. The incidence angle can be chosen from 5° to 12°, and the wavenumber range is 2–15/cm with the wavenumber resolution Δk/k≤0.21. Ray tracing simulations are used to calculate the scattering locations and the perpendicular wavenumber. The dynamic range of this new eight-channel Doppler backscattering system can be as large as 40 dB in the EAST. In this article, the hardware design, the ray tracing, and the preliminary experimental results in the EAST will be presented.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0010424; SC0010469

OSTI ID:: 1535325

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 7 Vol. 88; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

References (22)

Doppler reflectometry for the investigation of propagating density perturbations Hirsch, M.; Holzhauer, E.; Baldzuhn, J. Review of Scientific Instruments, Vol. 72, Issue 1 https://doi.org/10.1063/1.1308998	journal	January 2001
Doppler backscattering system for measuring fluctuations and their perpendicular velocity on Tore Supra Hennequin, P.; Honoré, C.; Truc, A. Review of Scientific Instruments, Vol. 75, Issue 10 https://doi.org/10.1063/1.1787920	journal	October 2004
Doppler reflectometer system in the stellarator TJ-II Happel, T.; Estrada, T.; Blanco, E. Review of Scientific Instruments, Vol. 80, Issue 7 https://doi.org/10.1063/1.3160106	journal	July 2009
A multichannel, frequency-modulated, tunable Doppler backscattering and reflectometry system Hillesheim, J. C.; Peebles, W. A.; Rhodes, T. L. Review of Scientific Instruments, Vol. 80, Issue 8 https://doi.org/10.1063/1.3205449	journal	August 2009
A novel, multichannel, comb-frequency Doppler backscatter system Peebles, W. A.; Rhodes, T. L.; Hillesheim, J. C. Review of Scientific Instruments, Vol. 81, Issue 10 https://doi.org/10.1063/1.3464266	journal	October 2010
On the role of spectral resolution in velocity shear layer measurements by Doppler reflectometry Happel, T.; Blanco, E.; Estrada, T. Review of Scientific Instruments, Vol. 81, Issue 10 https://doi.org/10.1063/1.3464475	journal	October 2010
Microwave Doppler reflectometer system in LHD Tokuzawa, T.; Ejiri, A.; Kawahata, K. Review of Scientific Instruments, Vol. 83, Issue 10 https://doi.org/10.1063/1.4733736	journal	October 2012
Microwave Doppler reflectometer system in the Experimental Advanced Superconducting Tokamak Zhou, C.; Liu, A. D.; Zhang, X. H. Review of Scientific Instruments, Vol. 84, Issue 10 https://doi.org/10.1063/1.4825344	journal	October 2013
Design of a Doppler reflectometer for KSTAR Lee, K. D.; Nam, Y. U.; Seo, Seong-Heon Review of Scientific Instruments, Vol. 85, Issue 11 https://doi.org/10.1063/1.4894000	journal	November 2014
Observations on core turbulence transitions in ASDEX Upgrade using Doppler reflectometry Conway, G. D.; Angioni, C.; Dux, R. Nuclear Fusion, Vol. 46, Issue 9 https://doi.org/10.1088/0029-5515/46/9/s15	journal	August 2006
Quasi-optical Gaussian beam tracing to evaluate Doppler backscattering conditions Honoré, C.; Hennequin, P.; Truc, A. Nuclear Fusion, Vol. 46, Issue 9 https://doi.org/10.1088/0029-5515/46/9/s16	journal	August 2006
Recent experiments in the EAST and HT-7 superconducting tokamaks Wan, Baonian Nuclear Fusion, Vol. 49, Issue 10 https://doi.org/10.1088/0029-5515/49/10/104011	journal	September 2009
Experimental investigations of LHW–plasma coupling and current drive related to achieving H-mode plasmas in EAST Ding, B. J.; Kong, E. H.; Li, M. H. Nuclear Fusion, Vol. 53, Issue 11 https://doi.org/10.1088/0029-5515/53/11/113027	journal	October 2013
First results of LHCD experiments with 4.6 GHz system toward steady-state plasma in EAST Liu, F. K.; Ding, B. J.; Li, J. G. Nuclear Fusion, Vol. 55, Issue 12 https://doi.org/10.1088/0029-5515/55/12/123022	journal	November 2015
Observations of the effect of lower hybrid waves on ELM behaviour in EAST Chen, R.; Xu, G. S.; Liang, Y. Nuclear Fusion, Vol. 55, Issue 3 https://doi.org/10.1088/0029-5515/55/3/033012	journal	February 2015
Theoretical and experimental investigation of the phase-runaway in microwave reflectometry Holzhauer, E.; Hirsch, M.; Grossmann, T. Plasma Physics and Controlled Fusion, Vol. 40, Issue 11 https://doi.org/10.1088/0741-3335/40/11/004	journal	November 1998
Experimental studies of the physical mechanism determining the radial electric field and its radial structure in a toroidal plasma Ida, Katsumi Plasma Physics and Controlled Fusion, Vol. 40, Issue 8 https://doi.org/10.1088/0741-3335/40/8/002	journal	August 1998
Doppler reflectometry for the investigation of propagating density perturbations Hirsch, M.; Holzhauer, E.; Baldzuhn, J. Plasma Physics and Controlled Fusion, Vol. 43, Issue 12 https://doi.org/10.1088/0741-3335/43/12/302	journal	October 2001
Plasma rotation profile measurements using Doppler reflectometry Conway, G. D.; Schirmer, J.; Klenge, S. Plasma Physics and Controlled Fusion, Vol. 46, Issue 6 https://doi.org/10.1088/0741-3335/46/6/003	journal	April 2004
High spatial sampling global mode structure measurements via multichannel reflectometry in NSTX Crocker, N. A.; Peebles, W. A.; Kubota, S. Plasma Physics and Controlled Fusion, Vol. 53, Issue 10 https://doi.org/10.1088/0741-3335/53/10/105001	journal	August 2011
Measurement of Turbulence Propagation Velocity Using Doppler Reflectometer on HL-2A Tokamak Weiwen, Xiao; Xuantong, Ding; Zetian, Liu Plasma Science and Technology, Vol. 10, Issue 4 https://doi.org/10.1088/1009-0630/10/4/01	journal	August 2008
Ray Tracing for Doppler Backscattering System in the Experimental Advanced Superconducting Tokamak Zhou, Chu; Liu, Adi; Hu, Jianqiang Plasma Science and Technology, Vol. 17, Issue 9 https://doi.org/10.1088/1009-0630/17/9/02	journal	September 2015

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Five-channel tunable W-band Doppler backscattering system in the experimental advanced superconducting tokamak Feng, X.; Liu, A. D.; Zhou, C. Review of Scientific Instruments, Vol. 90, Issue 2 https://doi.org/10.1063/1.5075615	journal	February 2019
Long-lived predator-prey dynamics in the pedestal of near-zero torque high performance DIII-D plasmas Barada, K.; Rhodes, T. L.; Burrell, K. H. Physics of Plasmas, Vol. 26, Issue 9 https://doi.org/10.1063/1.5097143	journal	September 2019
Experimental observation of coexisting electromagnetic fluctuations correlating with the inter-ELM pedestal evolution on EAST Lan, H.; Chen, R.; Xu, G. S. Physics of Plasmas, Vol. 26, Issue 12 https://doi.org/10.1063/1.5123734	journal	December 2019
Experimental study on the magnetic coherent mode in the H-mode pedestal of EAST Chen, Ran; Zhang, Heng; Xu, Guosheng Nuclear Fusion, Vol. 58, Issue 11 https://doi.org/10.1088/1741-4326/aab96e	journal	September 2018
Investigation of RMP induced density pump-out on EAST Wang, S. X.; Liu, H. Q.; Jie, Y. X. Nuclear Fusion, Vol. 58, Issue 11 https://doi.org/10.1088/1741-4326/aae15a	journal	October 2018
I-mode investigation on the Experimental Advanced Superconducting Tokamak Feng, X.; Liu, A. D.; Zhou, C. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab28a7	journal	July 2019

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