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Development of Multichannel Ion Doppler Spectroscopic System by Using Fast Camera
Author(s) -
HANAO TAKAFUMI,
UESAKA YOSHIHARU,
KAWAI TAKAHIRO,
KIKUCHI YUSUKE,
FUKUMOTO NAOYUKI,
NAGATA MASAYOSHI
Publication year - 2017
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.11936
Subject(s) - doppler effect , ion , plasma , physics , optics , detector , spectral line , joint european torus , doppler broadening , atomic physics , computational physics , tokamak , quantum mechanics , astronomy
SUMMARY The multichannel ion Doppler spectroscopic (M‐IDS) system using a fast camera as detectors has been newly developed to measure the spatial profiles of impurity spectral line emissions from plasmas. The M‐IDS system developed with eight viewing chords is characterized by the simplest optical systems, a fast sampling frequency, high number of shooting, and a low crosstalk of 3.5% on each chord. In order to verify the usefulness and reliability of the M‐IDS system, we have applied it for the start‐up plasma produced in the helicity injected spherical torus device. Resultantly, we have successfully measured the radial profiles of Doppler ion temperature T i .D and Doppler ion velocity v i .D of the plasma with a good Gaussian fitting. However, we have found that the sampling frequency is upper limited by 25 kHz because the signal detected with a faster frequency from the CIII impurity line emission is too weak to be analyzed, and thus the sensitivity of the total system needs to be improved.