Erlangen 2026 – scientific programme
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P: Fachverband Plasmaphysik
P 7: Magnetic Confinement III
P 7.1: Invited Talk
Tuesday, March 17, 2026, 16:15–16:45, KH 02.016
Post-puff SOL broadening on MAST-U: evidence for cross-field transport changes — •Yacopo Damizia1, Saskia Mordjick1, Nick Walkden2, Jack Lovell3, Steven Thomas4, and Ekin Ozturk1 — 1William & Mary, Williamsburg, VA, USA — 2UKAEA, Culham Campus, Abingdon, Oxfordshire, OX14 3DB, UK — 3Oak Ridge National Laboratory, Oak Ridge, TN, USA — 4MIT Plasma Science and Fusion Center, Cambridge, MA, USA
We test whether density shoulder formation and evolution in the MAST-U scrape-off layer are governed by parallel draining or cross-field transport. Two L-mode discharges with similar parameters each receive a 50 ms deuterium puff and are measured with Thomson scattering, Dα and Langmuir probes. In both cases the divertor stays attached/high reciclyng while an upstream shoulder forms, but its post-puff decay is much slower in the lower upstream collisionality shot, indicating that shoulder persistence is set by modified cross-field transport rather than parallel draining.
Keywords: MAST Upgrade; Scrape-off layer; Shoulder formation; Transport