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

asymmetry
emission spectra
temperature
Zeeman effect
neutral particles
convolution integrals
line of sight
line spectra
computerized simulation
recording
spectrometers
hydrogen
estimates
profiles

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
Yadava, Nandini ; Ghosh, J. ; Chowdhuri, M. B. ; Manchanda, R. ; Punchithaya, Sripathi K. ; Dey, Ritu ; Raj, Harshita ; Banerjee, S. ; Tanna, R. L. ; Jadeja, K. A. ; Patel, K. ; Kumar, Rohit ; Tripathi, Deepti. / Observation of poloidal asymmetry in measured neutral temperatures in the Aditya-U tokamak plasma. In: Nuclear Fusion. 2019 ; Vol. 59, No. 10.
@article{19273e02624543c8b834c5ce59c044cc,
title = "Observation of poloidal asymmetry in measured neutral temperatures in the Aditya-U tokamak plasma",
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.",
author = "Nandini Yadava and J. Ghosh and Chowdhuri, {M. B.} and R. Manchanda and Punchithaya, {Sripathi K.} and Ritu Dey and Harshita Raj and S. Banerjee and Tanna, {R. L.} and Jadeja, {K. A.} and K. Patel and Rohit Kumar and Deepti Tripathi",
year = "2019",
month = "8",
day = "13",
doi = "10.1088/1741-4326/ab2d57",
language = "English",
volume = "59",
journal = "Nuclear Fusion",
issn = "0029-5515",
publisher = "IOP Publishing Ltd.",
number = "10",

}

Yadava, N, Ghosh, J, Chowdhuri, MB, Manchanda, R, Punchithaya, SK, Dey, R, Raj, H, Banerjee, S, Tanna, RL, Jadeja, KA, Patel, K, Kumar, R & Tripathi, D 2019, 'Observation of poloidal asymmetry in measured neutral temperatures in the Aditya-U tokamak plasma', Nuclear Fusion, vol. 59, no. 10, 106003. https://doi.org/10.1088/1741-4326/ab2d57

Observation of poloidal asymmetry in measured neutral temperatures in the Aditya-U tokamak plasma. / Yadava, Nandini; Ghosh, J.; Chowdhuri, M. B.; Manchanda, R.; Punchithaya, Sripathi K.; Dey, Ritu; Raj, Harshita; Banerjee, S.; Tanna, R. L.; Jadeja, K. A.; Patel, K.; Kumar, Rohit; Tripathi, Deepti.

In: Nuclear Fusion, Vol. 59, No. 10, 106003, 13.08.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Observation of poloidal asymmetry in measured neutral temperatures in the Aditya-U tokamak plasma

AU - Yadava, Nandini

AU - Ghosh, J.

AU - Chowdhuri, M. B.

AU - Manchanda, R.

AU - Punchithaya, Sripathi K.

AU - Dey, Ritu

AU - Raj, Harshita

AU - Banerjee, S.

AU - Tanna, R. L.

AU - Jadeja, K. A.

AU - Patel, K.

AU - Kumar, Rohit

AU - Tripathi, Deepti

PY - 2019/8/13

Y1 - 2019/8/13

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85072711259&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85072711259&partnerID=8YFLogxK

U2 - 10.1088/1741-4326/ab2d57

DO - 10.1088/1741-4326/ab2d57

M3 - Article

VL - 59

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

IS - 10

M1 - 106003

ER -

Yadava N, Ghosh J, Chowdhuri MB, Manchanda R, Punchithaya SK, Dey R et al. Observation of poloidal asymmetry in measured neutral temperatures in the Aditya-U tokamak plasma. Nuclear Fusion. 2019 Aug 13;59(10). 106003. https://doi.org/10.1088/1741-4326/ab2d57