Calibration of phase contrast imaging on HL-2A Tokamak

Phase contrast imaging (PCI) has recently been developed on HL-2A tokamak. In this article we present the calibration of this diagnostic. This system is to diagnose chord integral density fluctuations by measuring the phase shift of a CO2 laser beam with a wavelength of 10.6 μm when the laser beam p...

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Published inJournal of instrumentation Vol. 12; no. 10; p. C10005
Main Authors Yu, Y., Gong, S.B., Xu, M., Xiao, C.J., Jiang, W., Zhong, W.L., Shi, Z.B., Wang, H.J., Wu, Y.F., Yuan, B.D., Lan, T., Ye, M.Y., Duan, X.R.
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 16.10.2017
Subjects
Calibration
Carbon dioxide
Carbon dioxide lasers
Diagnostic systems
Integrals
Laser beams
Lasers
Microscopes
Phase contrast
Plasma
Plasma density
Sound waves
Tokamak devices
Variations
Wavelengths
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Abstract Phase contrast imaging (PCI) has recently been developed on HL-2A tokamak. In this article we present the calibration of this diagnostic. This system is to diagnose chord integral density fluctuations by measuring the phase shift of a CO2 laser beam with a wavelength of 10.6 μm when the laser beam passes through plasma. Sound waves are used to calibrate PCI diagnostic. The signal series in different PCI channels show a pronounced modulation of incident laser beam by the sound wave. Frequency-wavenumber spectrum is achieved. Calibrations by sound waves with different frequencies exhibit a maximal wavenumber response of 12 cm−1. The conversion relationship between the chord integral plasma density fluctuation and the signal intensity is 2.3×1013 m−2/mV, indicating a high sensitivity.
AbstractList Phase contrast imaging (PCI) has recently been developed on HL-2A tokamak. In this article we present the calibration of this diagnostic. This system is to diagnose chord integral density fluctuations by measuring the phase shift of a CO2 laser beam with a wavelength of 10.6 μm when the laser beam passes through plasma. Sound waves are used to calibrate PCI diagnostic. The signal series in different PCI channels show a pronounced modulation of incident laser beam by the sound wave. Frequency-wavenumber spectrum is achieved. Calibrations by sound waves with different frequencies exhibit a maximal wavenumber response of 12 cm−1. The conversion relationship between the chord integral plasma density fluctuation and the signal intensity is 2.3×1013 m−2/mV, indicating a high sensitivity.
Author Yu, Y.
Wang, H.J.
Lan, T.
Zhong, W.L.
Duan, X.R.
Xiao, C.J.
Wu, Y.F.
Ye, M.Y.
Gong, S.B.
Jiang, W.
Shi, Z.B.
Yuan, B.D.
Xu, M.
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CitedBy_id crossref_primary_10_1016_j_fusengdes_2018_06_003
crossref_primary_10_1007_s10894_021_00302_8
crossref_primary_10_1016_j_fusengdes_2017_11_022
crossref_primary_10_1088_1748_0221_13_10_P10016
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Snippet Phase contrast imaging (PCI) has recently been developed on HL-2A tokamak. In this article we present the calibration of this diagnostic. This system is to...
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SubjectTerms Calibration
Carbon dioxide
Carbon dioxide lasers
Diagnostic systems
Integrals
Laser beams
Lasers
Microscopes
Phase contrast
Plasma
Plasma density
Sound waves
Tokamak devices
Variations
Wavelengths
Title Calibration of phase contrast imaging on HL-2A Tokamak
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