title: Microwave Doppler reflectometer system in the Experimental Advanced Superconducting Tokamak.
abstract: A Doppler reflectometer system has recently been installed in the Experimental Advanced Superconducting (EAST) Tokamak. It includes two separated systems, one for Q-band (33-50 GHz) and the other for V-band (50-75 GHz). The optical system consists of a flat mirror and a parabolic mirror which are optimized to improve the spectral resolution. A synthesizer is used as the source and a 20 MHz single band frequency modulator is used to get a differential frequency for heterodyne detection. Ray tracing simulations are used to calculate the scattering location and the perpendicular wave number. In EAST last experimental campaign, the Doppler shifted signals have been obtained and the radial profiles of the perpendicular propagation velocity during L-mode and H-mode are calculated.
authors.affiliation: Department of Modern Physics, CAS Key Laboratory of Geospace Environment, University of Science and Technology of China, Hefei, Anhui 230026, China.
authors.forename: C
authors.initials: C
authors.lastname: Zhou
authors.forename: A D
authors.initials: AD
authors.lastname: Liu
authors.forename: X H
authors.initials: XH
authors.lastname: Zhang
authors.forename: J Q
authors.initials: JQ
authors.lastname: Hu
authors.forename: M Y
authors.initials: MY
authors.lastname: Wang
authors.forename: H
authors.initials: H
authors.lastname: Li
authors.forename: T
authors.initials: T
authors.lastname: Lan
authors.forename: J L
authors.initials: JL
authors.lastname: Xie
authors.forename: X
authors.initials: X
authors.lastname: Sun
authors.forename: W X
authors.initials: WX
authors.lastname: Ding
authors.forename: W D
authors.initials: WD
authors.lastname: Liu
authors.forename: C X
authors.initials: CX
authors.lastname: Yu