Projected global stability of high beta MAST-U spherical tokamak plasmas

Berkery, J. W.; Xia, G.; Sabbagh, S. A.; Bialek, J. M.; Wang, Z. R.; Ham, C. J.; Thornton, A.; Liu, Y. Q.

doi:10.1088/1361-6587/ab98e1

Title: Projected global stability of high beta MAST-U spherical tokamak plasmas

Journal Article · Thu Jul 02 00:00:00 EDT 2020 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ab98e1· OSTI ID:1661155

^[1]; Xia, G. ^[2]; Sabbagh, S. A. ^[1]; Bialek, J. M. ^[1];

^[3];

^[2]; Thornton, A. ^[2];

^[4]

Columbia Univ., New York, NY (United States)
United Kingdom Atomic Energy Authority (UKAEA), Abingdon (United Kingdom)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)

Assessment of the limits of stability of tokamak plasmas is essential to operation in high fusion performance ranges without disruption of the plasma current. Projected equilibria have been generated for the MAST-U spherical tokamak experiment, an upgrade of the previous MAST device, in order to prepare for operation. These equilibria are scanned in pressure and current profiles, and assessed with the DCON and MARS-F stability codes to find the so-called 'no-wall' beta limit, above which resistive wall mode instabilities can be expected in the absence of other stabilising effects. The no-wall limit was generally found to increase as plasma internal inductance increased. The equilibria are also assessed for the 'with-wall' limit, theoretically the highest achievable performance point, again with the DCON and MARS-F codes, including different approximate axisymmetric walls, and with the VALEN code which includes a 3D model of the surrounding conducting structure. Similar limits were found, despite the difference between the 2D and 3D codes in the treatment of the wall. Conducting passive stabilisation plates, which were newly installed in MAST-U, are in a region of significant mode perturbation when the plasma β_N is sufficiently high and eddy currents are driven in these structures. Due to the increased stabilising effect of the wall in MAST-U vs. MAST, a significant gap exists between the approximate no-wall limits of β_N/l_i = 6.71 and 7.13, found from DCON and MARS-F respectively, and the with-wall limits of β_N/l_i = 8.23 and 8.53 for the equilibrium profiles analysed in this study. This opens a region of high beta operating space in MAST-U for potentially stable operation if non-ideal effects or active control can stabilise the resistive wall mode.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Columbia Univ., New York, NY (United States); General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); Engineering and Physical Sciences Research Council (EPSRC)

Grant/Contract Number:: SC0018623; FG02-95ER54309; AC02-09CH11466; FC02-04ER54698; EP/P012450/1

OSTI ID:: 1661155

Alternate ID(s):: OSTI ID: 1637390

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 62, Issue 8; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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