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Transient plasma-detachment events induced by multiple gas puffs in ADITYA-U tokamak

Year: 2025
Type: article
Abstract: Application of periodic short bursts of gas leads to periodic separation of the plasma column edge from the limiter in the Ohmically heated discharges of ADITYA-U tokamak. After every gas-puff, injecting around 1017–1018 m−3 molecules of fuel gas in the edge of the plasma column, a significant reduction in plasma density, temperature, Hα emission intensity and an increase in the Hβ/Hα ratio is observed in the vicinity of the limiter radius for a certain time duration before these parameters regain their pre-gas puff values. A decline in the ion-flux to the limiter is also observed simultaneously. The global confinement of plasma also increases after each gas-puff. These observations, which repeat after each gas-injection, imply that the plasma–neutral interaction occurs further away from the limiters after the gas-injection and indicate a periodic plasma separation from the limiter surface. Further investigation revealed that the gas-injection modifies the radial and toroidal electric field, which may be playing a role in the separation of the plasma column from the limiter surface. It was further demonstrated by an electrode bias experiment in the absence of gas-injection that an application of an external radial electric field can result in obtaining a separated plasma state.
DOI: 10.1063/5.0286193
Authors: Suman Dolui, Kaushlender Singh, Tanmay Macwan, Suman Aich, Harshita Raj, P. Gautam, Devilal Kumawat, Ankit Kumar, Ashok K. Kumawat, Bharat Hegde, Nandini Yadava, Sharvil Patel, Subhojit Bose, Injamul Hoque, Soumitra Banerjee, Komal Yadav, K. A. Jadeja, K. M. Patel, Rohit Kumar, M. B. Chowdhuri, Ritu Dey, Umesh Nagora, K. Tahiliani, S. K. Pathak, P. K. Chattopadhyay, A. Sen, Y. C. Saxena, R. Pal, R. L. Tanna, J. Ghosh
Language: English
Open Access status: hybrid
OpenAlex ID: W7090813937
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Cites: 50
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