1D profile measurement of ion velocity distribution with glass-tube-pair type Doppler probe array

We developed a glass-tube-pair type Doppler probe array for ion velocity distribution function measurement with high spatial and time resolution. By four mirrors and four optical fibers fixed in two parallel glass tubes, the light from ions in each measurement area (3.2 × 2.5 × 1.0 cm3) between tube...

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Veröffentlicht in:Physics of plasmas 2023-06, Vol.30 (6)
Hauptverfasser: Someya, Ryo, Nakau, Itsuki, Cai, Yunhan, Tanabe, Hiroshi, Ono, Yasushi
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container_issue 6
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container_title Physics of plasmas
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creator Someya, Ryo
Nakau, Itsuki
Cai, Yunhan
Tanabe, Hiroshi
Ono, Yasushi
description We developed a glass-tube-pair type Doppler probe array for ion velocity distribution function measurement with high spatial and time resolution. By four mirrors and four optical fibers fixed in two parallel glass tubes, the light from ions in each measurement area (3.2 × 2.5 × 1.0 cm3) between tubes is collected in three different directions, and the fibers are led to a Czerny–Turner spectrometer and finally to an ICCD camera (the exposure time of 2 μs) for Doppler spectra measurements with high time resolution. Since the Doppler spectrum profile in each viewing line represents the distribution of the ion velocity component in the line, we can reconstruct 2D velocity distribution by the measured spectra in three viewing lines with tomography techniques. We tested the accuracy of some reconstruction methods from spectra to velocity distribution in numerical simulation and chose the iterative method as the best one. By use of this new diagnostic, we successfully measured the radial profile of ion velocity distribution during magnetic reconnection of merging spherical tokamak plasmas and revealed that their ions have anisotropic velocity distributions.
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Arrays
Distribution functions
Image reconstruction
Ion velocity
Iterative methods
Line spectra
Optical fibers
Profile measurement
Spectra
Spherical plasmas
Tubes
Velocity
Velocity distribution
Viewing
title 1D profile measurement of ion velocity distribution with glass-tube-pair type Doppler probe array
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