Coherence imaging spectroscopy (CIS) measures the two-dimensional profiles of both ion temperature and ion velocity in plasmas. The interferometric technique is realized by a certain relation between the phase and the wavelength of light emerging from a birefringent crystal. The calibration for the CIS system requires monochromatic and tunable light sources near the He II line (468.6 nm) or C III line (465 nm) where the CIS measures. In this research, the CIS system has been upgraded by implementing an electron multiplier CCD and a CIS cell. A monochromator validates the linearity of the phase relation on the wavelength near the He II line. As an in situ calibration at the Ring Trap 1 plasma device, two spectral lines of Ti and Zn lamps obtain the accurate dispersion function of phase. It is found that a simple method with two spectral lines is reliable and sufficient for the calibration.
Calibration of coherence imaging spectroscopy using spectral line sources
Note: Paper published as part of the Special Topic on Proceedings of the 23rd Topical Conference on High-Temperature Plasma Diagnostics.
Kenji Ueda, Masaki Nishiura, Naoki Kenmochi, Zensho Yoshida, Kaori Nakamura; Calibration of coherence imaging spectroscopy using spectral line sources. Rev. Sci. Instrum. 1 July 2021; 92 (7): 073501. https://doi.org/10.1063/5.0043875
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