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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

1)

Institute of Advance Energy, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan

(Received 10 January 2008 / Accepted 7 March 2008 / Published 10 May 2008)

Abstract

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.

Copyright (c) 2008 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

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

DOI: 10.1585/pfr.3.020

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References

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• [3] J. Zhou et al., Plasma Sci. Techno. 8, 344 (2006).

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).