Kinetic-ballooning-bifurcation in tokamak pedestals across shaping and aspect-ratio

Parisi, J. F.; Nelson, A. O.; Gaur, R.; Kaye, S. M.; Parra, F. I.; Berkery, J. W.; Barada, K.; Clauser, C.; Creely, A. J.; Diallo, A.; Guttenfelder, W.; Hughes, J. W.; Kogan, L. A.; Kleiner, A.; Kuang, A. Q.; Lampert, M.; Macwan, T.; Menard, J. E.; Miller, M. A.

doi:10.1063/5.0190818

Kinetic-ballooning-bifurcation in tokamak pedestals across shaping and aspect-ratio

Journal Article · Thu Mar 21 00:00:00 EDT 2024 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0190818· OSTI ID:2567958

; ; ; ; ; ; ; ; ; ; Guttenfelder, W.; ; ; ; ; ; ; ;

We use a new gyrokinetic threshold model to predict a bifurcation in tokamak pedestal width-height scalings that depends strongly on plasma shaping and aspect-ratio. The bifurcation arises from the first and second stability properties of kinetic-ballooning-modes that yields wide and narrow pedestal branches, expanding the space of accessible pedestal widths and heights. The wide branch offers potential for edge-localized-mode-free pedestals with high core pressure. For negative triangularity, low-aspect-ratio configurations are predicted to give steeper pedestals than conventional-aspect-ratio. Both wide and narrow branches have been attained in tokamak experiments.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; SC0021629; SC0022272; SC0022270; SC0014264; AC02-09CH11466

OSTI ID:: 2567958

Alternate ID(s):: OSTI ID: 2341790

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 31; ISSN 1070-664X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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