Plasma and Fusion Research

Volume 13, 1405112 (2018)

Regular Articles

Measuring Faraday Effect in Z-Cut Crystal Quartz at Wavelength of 118.8 μm for Polarimeter
Ryota IMAZAWA, Kazuya NAKAYAMA1) and Tsuyoshi AKIYAMA2)
National Institute for Quantum and Radiological Science and Technology, 801-1 Mukoyama, Naka, Ibaraki 311-0193, Japan
1)
Chubu University, 1200 Matsumoto-cho, Kasugai, Aichi 487-8501, Japan
2)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
(Received 14 June 2018 / Accepted 15 August 2018 / Published 25 September 2018)

Abstract

Faraday rotation angle in Z-cut crystal quartz at a wavelength of 118.8 μm was measured for the first time. Z-cut crystal quartz is used in vacuum windows of polarimeters for plasma diagnostics that use far-infrared light. ITER poloidal polarimeter uses double vacuum windows of 10-mm Z-cut crystal quartz discs in compliance with nuclear safety. According to the Becquerel model, thick Z-cut crystal quartz may lead to non-negligible Faraday rotation that must be compensated for to measure the pure polarization change attributable to the plasma. For the first time, this paper measures Faraday rotation at the wavelength of 118.8 μm by means of the rotating linear polarizer method. The Becquerel model is not applicable at the wavelength of 118.8 μm and Faraday rotation resulting from the Z-cut quartz vacuum window is negligible even with a magnetic field of 0.3 T and a 10-mm thick vacuum window.

Keywords

Faraday rotation, Faraday effect, Verdet constant, ITER, polarimeter, Z-cut crystal, quartz, Becquerel model

DOI: 10.1585/pfr.13.1405112

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