Plasma and Fusion Research

Volume 16, 1202078 (2021)

Rapid Communications

Development of Glass-Tube-Pair Type Doppler Probe Array for 1D Profile Measurement of Two Component Ion-Flow Vector
Ryo SOMEYA, Haruaki TANAKA, Yugo FUNATO, Yunhan CAI, Moe AKIMITSU, Hiroshi TANABE and Yasushi ONO
Graduate School of Frontier Sciences, The University of Tokyo, Tokyo 113-0032, Japan
(Received 12 April 2021 / Accepted 25 April 2021 / Published 7 June 2021)

Abstract

We developed a new glass-tube-pair type Doppler probe array for 1D ion velocity vector and temperature measurement. It needs just two parallel glass-tube insertion, realizing low plasma perturbation and 1D ion flow vector measurement on a single discharge. Using four mirrors and optical fibers for one measurement point, this system can measure ion local light emissions of each measurement volume from four different directions, enabling us to measure local ion flow vector and temperature. All set of mirrors and optical fibers are aligned in the two parallel glass tubes for 1D measurement by a single discharge. This system measured successfully ion outflow speed of two merging tokamak plasmas, about 80% of poloidal Alfvén speed in agreement with recent reconnection experiments and theory.

Keywords

ion flow measurement, Doppler spectroscopy, magnetic reconnection, tokamak merging, outflow

DOI: 10.1585/pfr.16.1202078

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