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dc.contributor.authorBerkery, John-
dc.descriptionThe data for reproducing each figure is included here. For Figures 1-7 and 9b, the "x" and "y" data gives the center of the squares of the contour plots (labeled, with units, inside each file). The "z" data gives the Log10 of the number of equilibria in each square (for 9b the average amplitude of the FFT). For Figures 8, 9a, and 10, the data given are the time series of the various quantities plotted, which are labelled, with units, inside each file.en_US
dc.description.abstractThe MAST-U fusion plasma research device, the upgrade to the Mega Amp Spherical Tokamak, has recently completed its first campaign of physics operation. MAST-U operated with Ohmic, or one or two neutral beams for heating, at 400-800 kA plasma current, in conventional or “SuperX” divertor configurations. Equilibrium reconstructions provide key plasma physics parameters vs. time for each discharge, and diagrams are produced which show where the prevalence of operation occurred as well as the limits in various operational spaces. When compared to stability limits, the operation of MAST-U so far has generally stayed out of the low q, low density instability region, and below the high density Greenwald limit, high beta global stability limits, and high elongation vertical stability limit. MAST-U still has the potential to reach higher elongation, which could benefit the plasma performance. Despite the majority of operation happening below established stability limits, disruptions did occur in the flat-top phase of MAST-U plasmas. The reasons for these disruptions are highlighted, and possible strategies to avoid them and to extend the operational space of MAST-U in future campaigns are discussed.en_US
dc.description.sponsorshipThis work was supported by the U.S. Department of Energy under contract numbers DE-AC02-09CH11466 and DE-SC0018623. The United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. This work has also been funded by the EPSRC [grant number EP/T012250/1] and the EPSRC Energy Programme [grant number EP/W006839/1].en_US
dc.description.tableofcontentsReadme, Fig1, Fig2, Fig3, Fig4, Fig5, Fig6, Fig7, Fig8, Fig9a, Fig9b, Fig10en_US
dc.publisherPrinceton Plasma Physics Laboratory, Princeton Universityen_US
dc.relationJohn W Berkery et al (2023), Plasma Phys. Control. Fusion, in press
dc.subjectSpherical Tokamaken_US
dc.titleOperational Space and Performance Limiting Events in the First Physics Campaign of MAST-Uen_US
dc.contributor.funderU. S. Department of Energy contract number DE-AC02-09CH11466-
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