[Table of Contents]

Plasma and Fusion Research

Volume 3, 020 (2008)

Rapid Communications

Polarizer Development for Electron Cyclotron Resonance Heating Systems in a HL-2A Tokamak
Guo Qing ZHANG, Kazunobu NAGASAKI1), Jun ZHOU, Jin Song ZHANG, Gang Yu CHEN, Mei HUANG, He WANG and Jun RAO
Southwestern Institute of Physics, Chengdu, 610041, China
Institute of Advance Energy, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
(Received 10 January 2008 / Accepted 7 March 2008 / Published 10 May 2008)


The paper presents the development of sinusoidally grooved polarizers for electron cyclotron resonance heating (ECRH) systems in the HL-2A tokamak. The polarizer groove shape was designed according to a sinusoidal function with a groove period p = 0.48λ and depth d = 0.5λ. Here, λ is the wavelength, whose value is 4.41 mm. The low-power test results of the polarizer performance are in agreement with a numerical calculation based on the integral method developed in vector theories of diffraction gratings. High-power experiments reveal that 340 kW high-power EC waves can be transmitted through the corrugated waveguide line with the polarizer assembled in a miter bend at atmospheric pressure. With the polarizer, ECRH/electron cyclotron current drive (ECCD) experiments in the extraordinary mode have been successful in a HL-2A tokamak.


polarizer, electron cyclotron resonance heating (ECRH), electron cyclotron current drive (ECCD), HL-2A tokamak

DOI: 10.1585/pfr.3.020


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This paper may be cited as follows:

Guo Qing ZHANG, Kazunobu NAGASAKI, Jun ZHOU, Jin Song ZHANG, Gang Yu CHEN, Mei HUANG, He WANG and Jun RAO, Plasma Fusion Res. 3, 020 (2008).