Observation of poloidal asymmetry in measured neutral temperatures in the Aditya-U tokamak plasma

Nandini Yadava, J. Ghosh, M. B. Chowdhuri, R. Manchanda, Sripathi K. Punchithaya, Ritu Dey, Harshita Raj, S. Banerjee, R. L. Tanna, K. A. Jadeja, K. Patel, Rohit Kumar, Deepti Tripathi

Research output: Contribution to journalArticle

Abstract

The neutral particle temperature in the edge region of the Aditya-U tokamak has been measured by recording the hydrogen Balmer alpha emission spectra at 656.28 nm from different lines of sight in both the high and low field sides. The spatial profile of the Hα emission has been recorded using a 1 m multi-track spectrometer. The neutral temperature is estimated from the Doppler broadening of the measured Hα spectrum by appropriately removing the contribution from the Zeeman splitting of the spectral lines. A computer simulation code was developed to estimate the neutral temperature by including the broadening mechanisms such as Doppler broadening and the Zeeman effect to simulate the Hα emission spectrum along with the proper convolution of the instrumental width of the diagnostic system. It has been observed that the high field side neutral temperature (∼4-6 eV) during plasma flat top is almost twice that of the low field side (∼2-3 eV) suggesting poloidal asymmetry in the neutral temperature.

Original languageEnglish
Article number106003
JournalNuclear Fusion
Volume59
Issue number10
DOIs
Publication statusPublished - 13-08-2019
Externally publishedYes

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Yadava, N., Ghosh, J., Chowdhuri, M. B., Manchanda, R., Punchithaya, S. K., Dey, R., ... Tripathi, D. (2019). Observation of poloidal asymmetry in measured neutral temperatures in the Aditya-U tokamak plasma. Nuclear Fusion, 59(10), [106003]. https://doi.org/10.1088/1741-4326/ab2d57