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Studies of AM He Atomic Magnetometer for Fusion Plasmas

Hiroyuki KIYONAGA, Yoshinobu YAMADA, Yusuke IIDA and Takeshi FUKUDA

Graduated School of Engineering, Osaka University, A1-214, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan

(Received 28 November 2015 / Accepted 22 February 2016 / Published 15 April 2016)

Abstract

Amplitude modulated helium atomic magnetometers (AM He AOM) are proposed as a new method, which allows spatially resolved magnetic field measurement in the inner regions of burning plasmas without heating beams nor impurity atoms. In order to understand the fundamental properties of AM He AOM, we have developed a prototype, and Helium discharge lamp as well as its power supply has been also elaborated as a light source. 1083 nm AM emission was successfully obtained in the frequency range between 40 kHz and 500 kHz. We have performed an exploratory experiment of test magnetic field measurement with the developed AM He AOM. For the test magnetic fields: 2.6 μT and 5.0 μT, possible signs of magnetic field have been observed.

Copyright (c) 2016 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

atomic magnetometer, optically pumped magnetometer, optically driven spin precession, burning plasma diagnostics, magnetic turbulence

DOI: 10.1585/pfr.11.2402046

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