[Table of Contents]

Plasma and Fusion Research

Volume 3, 032 (2008)

Regular Articles

Assessment of Laser Transmission Mirror Materials for ITER Edge Thomson Scattering Diagnostics
Shin KAJITA, Takaki HATAE and Vladimir S. VOITSENYA1)
Fusion Research and Development Directorate, Japan Atomic Energy Agency, 801-1 Mukoyama, Naka, Ibaraki 311-0193,Japan
1)
Institute of Plasma Physics, National Science Centre, Kharkov Institute of Science and Technology, Kharkov 61108, Ukraine
(Received 13 March 2008 / Accepted 15 May 2008 / Published 17 June 2008)

Abstract

An assessment of in-vessel metallic mirror materials for the transmission of the laser beam used in the ITER edge Thomson scattering diagnostics is reported. The transient temperature increase due to the laser pulse irradiation on the laser transmission mirror is calculated by a one-dimensional heat conduction equation. Candidate mirror materials are discussed based on a comparison between the numerical calculation and current data relevant to the laser-induced damage threshold (LIDT). Gold, silver, and copper are considered promising because of its high reflectivity. The LIDT is evaluated considering multi-pulse effects and used to determine the necessary size for the laser transmission mirror for the ITER edge Thomson scattering diagnostics.

Keywords

laser Thomson scattering, mirror material, laser induced damage threshold, numerical assessment

DOI: 10.1585/pfr.3.032

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This paper may be cited as follows:

Shin KAJITA, Takaki HATAE and Vladimir S. VOITSENYA, Plasma Fusion Res. 3, 032 (2008).