DOE OSTI · 3012091
Effect of convective transport in edge and scrape-off-layer plasmas of ADITYA-U tokamak
Abstract
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 10 19 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 m 2 /s to adequately match the measured n e profile in typical discharges of ADITYA-U. The value of D ⟂ ~ 0.2 m 2 /s is found to lie between the estimated neoclassical diffusivity and Bohm diffusivity.
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Dey, Ritu [Indian Institute of Technology (IIT), Tirupati (India); Institute for Plasma Research (IPR), Gandhinagar (India)], Chowdhuri, M. B. [Institute for Plasma Research (IPR), Gandhinagar (India); Homi Bhabha National Institute (HBNI), Mumbai (India)], Ghosh, Joydeep [Institute for Plasma Research (IPR), Gandhinagar (India); Homi Bhabha National Institute (HBNI), Mumbai (India)], Macwan, Tanmay M. [Institute for Plasma Research (IPR), Gandhinagar (India); Homi Bhabha National Institute (HBNI), Mumbai (India); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)], Singh, Kaushlender [Institute for Plasma Research (IPR), Gandhinagar (India); Homi Bhabha National Institute (HBNI), Mumbai (India)], Raj, H. [Institute for Plasma Research (IPR), Gandhinagar (India)], Tanna, R. L. [Institute for Plasma Research (IPR), Gandhinagar (India)], Manchanda, R. [Institute for Plasma Research (IPR), Gandhinagar (India)], Sharma, Deepti [Institute for Plasma Research (IPR), Gandhinagar (India)], Rognlien, Tom D. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)]. 2025-12-06. Effect of convective transport in edge and scrape-off-layer plasmas of ADITYA-U tokamak. https://doi.org/10.1038/s41598-025-31182-z
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