title: Development of frequency modulated continuous wave reflectometer for electron density profile measurement on the HL-2A tokamak.
abstract: The frequency modulated continuous wave reflectometer was developed for the first time on the HL-2A tokamak. The system utilizes a voltage controlled oscillator and an active multiplier for broadband coverage and detects as heterodyne mode. Three reflectometers have been installed and operated in extraordinary mode polarization on HL-2A to measure density profiles at low field side, covering the Q-band (33-50 GHz), V-band (50-75 GHz), and W-band (75-110 GHz). For density profile reconstruction from the phase shift of the probing wave, a corrected phase unwrapping method is introduced in this article. The effectiveness of the method is demonstrated. The density profile behavior of a fast plasma event is presented and it demonstrates the capability of the reflectometer. These diagnostics will be contributed to the routine density profile measurements and the plasma physics study on HL-2A.
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: W L
authors: WL
authors: Zhong
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: Z B
authors: ZB
authors: Shi
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: X L
authors: XL
authors: Huang
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: Z T
authors: ZT
authors: Liu
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: W
authors: W
authors: Chen
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: M
authors: M
authors: Jiang
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: J
authors: J
authors: Li
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: Z Y
authors: ZY
authors: Cui
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: X M
authors: XM
authors: Song
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: L Y
authors: LY
authors: Chen
authors: CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.
authors: X L
authors: XL
authors: Zou
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: X T
authors: XT
authors: Ding
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: Yi
authors: Y
authors: Liu
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: L W
authors: LW
authors: Yan
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: Q W
authors: QW
authors: Yang
authors: Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.
authors: X R
authors: XR
authors: Duan