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

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

doi:10.1063/5.0190818

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

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

Astrophysical Sciences

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2 Scopus citations

Abstract

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.

Original language	English (US)
Article number	030702
Journal	Physics of Plasmas
Volume	31
Issue number	3
DOIs	https://doi.org/10.1063/5.0190818
State	Published - Mar 1 2024

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/5.0190818

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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. (2024). Kinetic-ballooning-bifurcation in tokamak pedestals across shaping and aspect-ratio. Physics of Plasmas, 31(3), Article 030702. https://doi.org/10.1063/5.0190818

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title = "Kinetic-ballooning-bifurcation in tokamak pedestals across shaping and aspect-ratio",

abstract = "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.",

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

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Parisi, JF, Nelson, AO, Gaur, R, Kaye, SM, Parra, FI, Berkery, JW, Barada, K, Clauser, C, Creely, AJ, Diallo, A, Guttenfelder, W, Hughes, JW, Kogan, LA, Kleiner, A, Kuang, AQ, Lampert, M, Macwan, T, Menard, JE & Miller, MA 2024, 'Kinetic-ballooning-bifurcation in tokamak pedestals across shaping and aspect-ratio', Physics of Plasmas, vol. 31, no. 3, 030702. https://doi.org/10.1063/5.0190818

TY - JOUR

T1 - Kinetic-ballooning-bifurcation in tokamak pedestals across shaping and aspect-ratio

AU - Parisi, J. F.

AU - Nelson, A. O.

AU - Gaur, R.

AU - Kaye, S. M.

AU - Parra, F. I.

AU - Berkery, J. W.

AU - Barada, K.

AU - Clauser, C.

AU - Creely, A. J.

AU - Diallo, A.

AU - Guttenfelder, W.

AU - Hughes, J. W.

AU - Kogan, L. A.

AU - Kleiner, A.

AU - Kuang, A. Q.

AU - Lampert, M.

AU - Macwan, T.

AU - Menard, J. E.

AU - Miller, M. A.

PY - 2024/3/1

Y1 - 2024/3/1

N2 - 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.

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

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