Development of frequency modulated continuous wave reflectometer for electron density profile measurement on the HL-2A tokamak

Journal Article · Wed Jan 15 00:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4861918· OSTI ID:22251116

Shi, Z. B.; Liu, Z. T.; Chen, W.; Jiang, M.; Li, J.; Cui, Z. Y.; Song, X. M.; Chen, L. Y.; Ding, X. T.; Liu, Yi; Yan, L. W.; Yang, Q. W.; Duan, X. R. ^[1]; Huang, X. L. ^[1]; Zou, X. L. ^[2]

---

1. Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041 (China)
2. CEA, IRFM, F-13108 Saint-Paul-lez-Durance (France)

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.

• OSTI ID: 22251116
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRIC POTENTIAL
ELECTRON DENSITY
GHZ RANGE 01-100
HL-2A TOKAMAK
OSCILLATORS
PHASE SHIFT
PLASMA
POLARIZATION