Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session PP11: Poster Session VI: In-Person, Hall A (2:00-3:30pm) and Virtual Poster Presentations (3:45-5:00pm)
MFE: Diagnostics; Edge and Pedestal; Stability; Heating; Transport, Turbulence
ASTRO: Astrophysical Plasma
2:00 PM - 5:00 PM
Wednesday, October 19, 2022
Room: Exhibit Hall A and Online
Abstract: PP11.00116 : MHD triggered GAM in ADITYA-U tokamak
Presenter:
Kaushlender Singh
(Institute For Plasma Research)
Authors:
Kaushlender Singh
(Institute For Plasma Research)
Harshita Raj
(Institute For Plasma Research)
Tanmay Macwan
(Institute For Plasma Research)
Suman Dolui
(Institute For Plasma Research)
Ankit Kumar
(Institute For Plasma Research)
Bharat Hegde
(Institute For Plasma Research)
Ashok Kumawat
(Institute For Plasma Research)
Pramila Gautam
(Institute For Plasma Research)
Rohit Kumar
(Institute For Plasma Research)
Suman Aich
(Institute For Plasma Research)
Laxmikanta Pradhan
(Institute For Plasma Research)
Ankit Patel
(Institute For Plasma Research)
Kalpesh Galodiya
(Institute For Plasma Research)
Kaushal Patel
(Institute For Plasma Research)
Kumarpalsinh A Jadeja
(Institute For Plasma Research)
Lavkesh Lachhvani
(Institute For Plasma Research)
Rakesh Tanna
(Institute For Plasma Research)
Joydeep Ghosh
(Institute For Plasma Research)
Collaboration:
ADITYA-U Team
Signatures of coupling between the MHD oscillations and fluctuations in edge density (ne) and floating potential (Vf) have been observed in ADITYA-U tokamak. Systematic analysis of a large discharge database (~100) indicates that these coherent edge fluctuations are triggered only when the MHD amplitude exceeds a threshold value otherwise the fluctuation frequencies are in a broadband range. Detailed analysis of these MHD triggered fluctuations using toroidally and poloidaly distributed Langmuir probe arrays revealed that the poloidal mode number (m) for ne fluctuations is ≈ 1.156 and for Vf it is ≈ 0.03 which is a characteristic of GAMs. These results indicate that these MHD oscillations are the origin of GAMs in ADITYA-U tokamak. In this paper, we will present a detailed analysis of this coupling and the resulting GAMs and their characteristics.
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