Bulletin of the American Physical Society
63rd Annual Meeting of the APS Division of Plasma Physics
Volume 66, Number 13
Monday–Friday, November 8–12, 2021; Pittsburgh, PA
Session UO07: MFE: Heating, Current Drive, and Scenarios
2:00 PM–5:00 PM,
Thursday, November 11, 2021
Room: Rooms 315-316
Chair: Robert Pinsker, General Atomics - San Diego
Abstract: UO07.00004 : Electron Bernstein Wave heating and current drive for MAST Upgrade*
2:48 PM–3:00 PM
Presenter:
Simon Freethy
Authors:
Simon Freethy
Alf Koehn-Seeman
(Institute of Interfacial Process Engineering and Plasma Technology, University of Stuttgart, Stuttgart, Germany)
Bengt Eliasson
(SUPA, Physics Department, John Anderson Building, Strathclyde University, Glasgow, G4 0NG, Scotland, UK)
Luca Garzotti
(United Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK)
Helen Webster
(United Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK)
Sam Gibson
(United Kingdom Atomic Energy Authority, Culham Centre for Fusion Energy, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK)
To investigate its use, MAST Upgrade will install a 2nd harmonic EBW system as part of its enhancements program. The frequency is chosen to maximise the coupling efficiency for low-field-side launch, minimise the effect of density perturbations while maintaining efficient current drive. A low-field side launcher design allows coupling to EBW via O-X-B mode conversion, for near-axis co-current, counter-current and heating, as well as off-axis co-current drive. Predicted efficiencies of up to 0.144 A/W have been found (ξCD = 0.63). Full wave simulations have demonstrated coupling efficiency of ~96% in quiescent plasma conditions. The effect of turbulent perturbations on the coupling are also investigated, with scans in turbulent amplitude, position and scale informing the impact on coupling.
*This work has been part-funded by the RCUK Energy Programme [grant number EP/T012250/1]
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