X-point radiation, its control and an ELM suppressed radiating regime at the ASDEX Upgrade tokamak

0538145 - ÚFP 2021 RIV AT eng J - Článek v odborném periodiku
Bernert, M. - Janky, F. - Sieglin, B. - Kallenbach, A. - Lipschultz, B. - Reimold, F. - Wischmeier, M. - Cavedon, M. - David, P. - Dunne, M.G. - Griener, M. - Kudláček, O. - McDermott, R.M. - Treutterer, W. - Wolfrum, E. - Brida, D. - Février, C. - Henderson, S. - Komm, Michael
X-point radiation, its control and an ELM suppressed radiating regime at the ASDEX Upgrade tokamak.
Nuclear Fusion. Roč. 61, č. 2 (2021), č. článku 024001. ISSN 0029-5515. E-ISSN 1741-4326
GRANT EU: European Commission(XE) 633053 - EUROfusion
Institucionální podpora: RVO:61389021
Klíčová slova: high confinement * power exhaust * detachment * impurity seeding * detachment control * ELM suppression * X-point radiation * ASDEX Upgrade
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 4.215, rok: 2021
Způsob publikování: Open access
https://iopscience.iop.org/article/10.1088/1741-4326/abc936

Future fusion reactors require a safe, steady state divertor operation. The required detached operation is, in tokamaks with metal walls, usually achieved by seeding of impurities, such as nitrogen. With strong seeding levels, the dominant radiation is emitted from a small, poloidally localized volume inside the confined region, in the vicinity of the X-point. The location of the radiating volume is observed to vary relative to the X-point depending on seeding and power levels, i.e. depending on the degree of detachment. At the ASDEX Upgrade tokamak, the position of the radiator relative to the X-point can be controlled in real time by a modulation of the nitrogen puff level. At a certain height of the radiator above the X-point, an ELM-suppressed regime is observed with minimal reduction of confinement. While the control of the X-point radiator already allows operation in full detachment at a dissipated power fraction of around 95 %, which is required for a future reactor and was previously never achieved in a controlled way, such an ELM-suppressed regime additionally eliminates the challenge of the transient, intolerably high heat fluxes by ELMs. Both requirements are met in the presented regime while maintaining a high energy confinement at high density.
Trvalý link: http://hdl.handle.net/11104/0315966