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Effect of Biasing Voltage on Hydrogen (Hβ) Temperature in IR-T1 Tokamak, Using Spectroscopy

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Abstract

In this research, the influence of the biasing voltage on hydrogen temperature and plasma confinement is investigated in the IR-T1 tokamak. The applied voltage was in the range of − 250 to + 250 V. Hydrogen (Hβ) temperature was estimated using measurements provided by the optical system based on a two-channel AvaSpec-ULS3648TEC-2-RS-USB2 visible light spectrometer on IR-T1 tokamak. The FWHM of Hβ spectral line was determined by normalizing and fitting the Gaussian distribution function to the experimental data. The hydrogen temperature was calculated in each state (Vbiasing = − 250 V and Vbiasing = + 250 V) at the plasma edge of IR-TI tokamak, using the effects of Doppler and instrument broadenings. Finally, the results were compared with the normal state (Vbiasing = 0 V). The spectroscopic results show a significant decrease in the spectral emission and subsequently improvement in confinement for positive biasing and significant decrease in plasma-edge temperature for negative biasing. These results illustrate the effect of radial induced electric field on plasma confinement.

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Acknowledgements

This research was supported by University of Mazandaran and PPRC-SRBIAU (Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran). The authors would like to thank Mr. Reza Arvin and Mr. Syamak Mohammadi as the IR-T1 tokamak team for their efforts in carrying out the project.

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Authors and Affiliations

  1. Physics Department, University of Mazandaran, P. O. Box 47415-416, Babolsar, Iran

    M. Mahdavi & M. Fallah

  2. Plasma Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran

    M. Ghoranneviss & S. Meshkani

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  1. M. Mahdavi
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  2. M. Fallah
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  3. M. Ghoranneviss
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  4. S. Meshkani
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Correspondence to M. Mahdavi.

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Mahdavi, M., Fallah, M., Ghoranneviss, M. et al. Effect of Biasing Voltage on Hydrogen (Hβ) Temperature in IR-T1 Tokamak, Using Spectroscopy. Iran J Sci Technol Trans Sci 45, 361–366 (2021). https://doi.org/10.1007/s40995-020-00978-1

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  • DOI: https://doi.org/10.1007/s40995-020-00978-1

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