用于HL-2A托卡马克电子密度剖面测量的调频连续波反射计的研制。

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

作者信息

Zhong W L, Shi Z B, Huang X L, Liu Z T, Chen W, Jiang M, Li J, Cui Z Y, Song X M, Chen L Y, Zou X L, Ding X T, Liu Yi, Yan L W, Yang Q W, Duan X R

机构信息

Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041, China.

CEA, IRFM, F-13108 Saint-Paul-lez-Durance, France.

出版信息

Rev Sci Instrum. 2014 Jan;85(1):013507. doi: 10.1063/1.4861918.

DOI:10.1063/1.4861918

PMID:24517765

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.

摘要

调频连续波反射仪首次在HL-2A托卡马克上研制成功。该系统利用压控振荡器和有源倍频器实现宽带覆盖，并采用外差模式进行检测。三台反射仪已安装在HL-2A上，并以异常模式极化运行，用于测量低场侧的密度分布，覆盖Q波段（33 - 50 GHz）、V波段（50 - 75 GHz）和W波段（75 - 110 GHz）。为了从探测波的相移重建密度分布，本文介绍了一种校正相位展开方法。证明了该方法的有效性。给出了快速等离子体事件的密度分布行为，展示了反射仪的能力。这些诊断将有助于HL-2A上的常规密度分布测量和等离子体物理研究。