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

doi:10.1088/1741-4326/ab2d57

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

Department of Physics, Manipal Institute of Technology, Manipal

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

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 H_α emission has been recorded using a 1 m multi-track spectrometer. The neutral temperature is estimated from the Doppler broadening of the measured H_α 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 H_α 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 language	English
Article number	106003
Journal	Nuclear Fusion
Volume	59
Issue number	10
DOIs	https://doi.org/10.1088/1741-4326/ab2d57
Publication status	Published - 13-08-2019

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/1741-4326/ab2d57

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@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 = aug,

day = "13",

doi = "10.1088/1741-4326/ab2d57",

language = "English",

volume = "59",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

number = "10",

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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.

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DO - 10.1088/1741-4326/ab2d57

M3 - Article

AN - SCOPUS:85072711259

SN - 0029-5515

VL - 59

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 10

M1 - 106003

ER -

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

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