Space- and time-resolved visible-emission spectroscopy of Aditya-tokamak discharges using multi-track spectrometer

Banerjee, Santanu; Kumar, Vinay; Chowdhuri, M. B.; Ghosh, Joydeep; Manchanda, R.; Patel, Ketan M.; Vasu, P.

doi:10.1088/0957-0233/19/4/045603

Cited by 22 publications

(27 citation statements)

References 9 publications

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“…The spatial profile of 650.024 nm spectral line emitted by the O 4+ ion was measured using a space resolved visible spectroscopic system [13]. It was equipped with a 1 m visible spectrometer with 1800 grooves/mm grating blazed at 500 nm.…”

Section: Methodsmentioning

confidence: 99%

“…Standard magnetic diagnostics were used to measure the plasma current, loop voltage, plasma position, and magneto-hydrodynamic (MHD) activities [12]. The spatial profile of 650.024 nm spectral line emitted by the O 4+ ion was measured using a space resolved visible spectroscopic system [13]. It was equipped with a 1 m visible spectrometer with 1800 grooves/mm grating blazed at 500 nm.…”

Section: Methodsmentioning

confidence: 99%

“…In the Aditya tokamak [12], an intense visible line from Be-like oxygen at 650.024 nm (2p3p 3 D 3 -2p3d 3 F 4 ) is routinely observed [13]. Therefore, this emission was used to study the impurity transport in the Aditya tokamak by utilizing the advantage of visible spectroscopy, which is the use of optical fiber for the space resolved measurement.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of an Oxygen Transport Coefficient in the Aditya Tokamak Using the Radial Profile of O4+ Emissivity and the Importance of Atomic Data Used Therein

Chowdhuri

Ghosh

Dey

et al. 2019

Atoms

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Oxygen impurity transport in the typical discharges of the Aditya tokamak was investigated using emissivity radial profile of emissivity of the spectral line (2p3p 3D3–2p3d 3F4) at 650.024 nm from the Be-like oxygen ion. This O4+ spectral line was recorded using a 1.0 m multi-track spectrometer capable of simultaneous measurements from eight lines of sight passing through the plasma. The oxygen transport coefficients were determined by reproducing the experimentally measured emissivity profiles of O4+, using a one-dimensional impurity transport code, STRAHL, and photon emissivity coefficient (PEC) belonging to that transition. The PEC values were obtained from both ADAS and NIFS atomic databases. Using both the databases, much higher values of diffusion coefficients compared to the neo-classical values were observed in both high and low magnetic field edge regions of typical Aditya tokamak Ohmic plasma. Although, almost similar profiles of diffusion coefficients were obtained using PEC values from both databases, the magnitude differs considerably. The maximum values of diffusion coefficients in the plasma edge at low field side of tokamak were ~45 and ~25 m2·s−1 when modeling was done using the ADAS and NIFS databases, respectively. Further analysis on the atomic data used in the calculation indicates that the difference in diffusion coefficients is mainly related to the variation in the values of atomic data of the two databases.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of an Oxygen Transport Coefficient in the Aditya Tokamak Using the Radial Profile of O4+ Emissivity and the Importance of Atomic Data Used Therein

Chowdhuri

Ghosh

Dey

et al. 2019

Atoms

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“…Furthermore, the spectra are recorded three times in order to check reproducibility. In order to present the fitting error, the standard deviation of all fitted data sets has been designated by the error bars as reported in [31]. The average results of electron temperature and electron density are presented in this paper.…”

Section: Methodsmentioning

confidence: 99%

Effect of Microwave Power on Electron Temperature and Electron Density in Deuterium Plasma Generated by Electron Cyclotron Resonance

Mostako

Vala

Makwana

et al. 2016

IEEE Trans. Plasma Sci.

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The desire for continuously gaining new knowledge in fusion reactor technology has pushed the frontier of engineering methods to deliver highly stable ion source for 14-MeV neutron generators. The diagnostic of the ion source of 14-MeV neutron generator is one of the prime concerns for future fusion reactor technology. An accelerator-based 14-MeV neutron generator is developed at Fusion Neutronics Laboratory of Institute for Plasma Research, Gandhinagar, India. The ion source of this 14-MeV neutron generator is diagnosed via the optical emission spectroscopy technique. In order to achieve optimum electron temperature and electron density for stable operation of ion source, the controlling parameters, namely, deuterium ambient gas pressure, ambient gas flow rate, and microwave power coupled to the deuterium plasma, are varied systematically. An investigation on the effect of microwave power coupled with deuterium plasma on the overall electron temperature as well as electron density is investigated in this paper. Prominent Balmer emission lines of deuterium α, β, and γ (D α , D β , and D γ ) are observed in the deuterium plasma generated by electron cyclotron resonance. The overall electron temperature of deuterium plasma is measured by Boltzmann plot at various microwave power, 100-400 W, whereas the electron density is measured by Stark broadening.Index Terms-Deuterium plasma, electron cyclotron resonance, electron density, electron temperature.

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“…The present study is a comparison between the experimental emissivity data and the calculated (simulated) emissivity values in the Aditya tokamak. The plasma in Aditya tokamak (minor radius r o = 0.25 m, major radius R = 0.75 m, toroidal magnetic field B t = 0.75 T) at the Institute for Plasma Research Gandhinagar, India is hydrogenic, confined within a graphite limiter and is circular in cross-section [8]. Experiment has been conducted to study the Be-like O 4+ ion transport in Aditya tokamak using emissivity values of its characteristic 650.024 nm (2p3p 3 D 3 -2p3d 3 F 4 ) transition.…”

Section: Introductionmentioning

confidence: 99%

A Study of the O<sup>4</sup><sup>+ </sup>Emissivity Profiles with Two Separate Photon Emissivity Coefficient Databases and a Comparison of the Impurity Diffusion Coefficients in the Aditya Tokamak

Bhattacharya

Ghosh

Chowdhuri

et al. 2019

Plasma and Fusion Research

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The present study is an analysis between radial emissivity profiles of the 650.024 nm transition of the O 4+ ion obtained using two separate Photon Emissivity Coefficient (PEC) databases. Emissivity values of the 650.024 nm O 4+ transition in visible-spectral region have been experimentally obtained for the Aditya tokamak. The radial number density distributions of different charge states of oxygen are estimated using a semi-implicit numerical method applied over the radial impurity transport equation. The 650.024 nm emissivity is calculated using the obtained impurity number density and with PECs from two separate databases namely the ADAS (Atomic Data and Analysis Structure) and the NIFS (National Institute for Fusion Science) database. Although impurity diffusivity profiles must not be dependent upon the choice of PEC databases; yet a requirement of separate impurity (oxygen) diffusivity profiles for the two PEC databases is observed, such that their corresponding calculated O 4+ emissivities best depict the experimental emissivity data. A difference in the ionization and recombination rate coefficients provided in the ADAS and NIFS databases can lead to discrepancies in the impurity number densities calculated. The effects upon the impurity diffusivity while using ionization and recombination rate coefficients from two separate databases are further studied.

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Space- and time-resolved visible-emission spectroscopy of Aditya-tokamak discharges using multi-track spectrometer

Cited by 22 publications

References 9 publications

Evaluation of an Oxygen Transport Coefficient in the Aditya Tokamak Using the Radial Profile of O4+ Emissivity and the Importance of Atomic Data Used Therein

Evaluation of an Oxygen Transport Coefficient in the Aditya Tokamak Using the Radial Profile of O4+ Emissivity and the Importance of Atomic Data Used Therein

Effect of Microwave Power on Electron Temperature and Electron Density in Deuterium Plasma Generated by Electron Cyclotron Resonance

A Study of the O<sup>4</sup><sup>+ </sup>Emissivity Profiles with Two Separate Photon Emissivity Coefficient Databases and a Comparison of the Impurity Diffusion Coefficients in the Aditya Tokamak

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