Effect of convective transport in edge and scrape-off-layer plasmas of ADITYA-U tokamak

Dey, Ritu; Chowdhuri, M. B.; Ghosh, Joydeep; Macwan, Tanmay M.; Singh, Kaushlender; Raj, H.; Tanna, R. L.; Manchanda, R.; Sharma, Deepti; Rognlien, Tom D.

doi:10.1038/s41598-025-31182-z

Effect of convective transport in edge and scrape-off-layer plasmas of ADITYA-U tokamak

Journal Article · Sat Dec 06 00:00:00 EST 2025 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-025-31182-z· OSTI ID:3012091

Dey, Ritu ^[1]; Chowdhuri, M. B. ^[2]; Ghosh, Joydeep ^[2]; Macwan, Tanmay M. ^[3]; Singh, Kaushlender ^[2]; Raj, H. ^[4]; Tanna, R. L. ^[4]; Manchanda, R. ^[4]; Sharma, Deepti ^[4]; Rognlien, Tom D. ^[5]

Indian Institute of Technology (IIT), Tirupati (India); Institute for Plasma Research (IPR), Gandhinagar (India)
Institute for Plasma Research (IPR), Gandhinagar (India); Homi Bhabha National Institute (HBNI), Mumbai (India)
Institute for Plasma Research (IPR), Gandhinagar (India); Homi Bhabha National Institute (HBNI), Mumbai (India); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Institute for Plasma Research (IPR), Gandhinagar (India)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

The 2-D edge plasma fluid transport code, UEDGE has been used to simulate the edge and scrape-off layer regions of circular limiter plasmas of ADITYA-U. The computational mesh defining the limiter geometry of ADITYA-U has been introduced in the UEDGE code through an in-house developed routine. It has successfully been integrated with the UEDGE code and the measured radial profile of electron density (n_e) in the edge region is modelled using the simulations. The plasma discharge for the present study has plasma current I_P ~ 130 kA, duration ~ 150 ms, chord-averaged electron density ~ 1.3 x 10¹⁹ m^-3, and central electron temperature ~ 270 eV has been observed. The maximum toroidal magnetic field is ~ 1.2 T. It has been found that an inward convective velocity, v_conv ~ 1.5 m/s is required in addition to the constant perpendicular diffusion coefficient, D_⟂ ~ 0.2 m²/s to adequately match the measured n_e profile in typical discharges of ADITYA-U. The value of D_⟂ ~ 0.2 m²/s is found to lie between the estimated neoclassical diffusivity and Bohm diffusivity.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 3012091

Report Number(s):: LLNL--JRNL-2014422

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 16; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Effect of convective transport in edge and scrape-off-layer plasmas of ADITYA-U tokamak

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