Professor Felix Parra Diaz: Publications

Ion-temperature- and density-gradient-driven instabilities and turbulence in Wendelstein 7-X close to the stability threshold

Journal of Plasma Physics Cambridge University Press (CUP) 90:4 (2024) 905900414

Authors:

L Podavini, A Zocco, JM García-Regaña, M Barnes, FI Parra, A Mishchenko, P Helander

Flexible Stellarator Physics Facility

(2024)

Authors:

FI Parra, S-G Baek, M Churchill, DR Demers, B Dudson, NM Ferraro, B Geiger, S Gerhardt, KC Hammond, S Hudson, R Jorge, E Kolemen, DM Kriete, STA Kumar, M Landreman, C Lowe, DA Maurer, F Nespoli, N Pablant, MJ Pueschel, A Punjabi, JA Schwartz, CPS Swanson, AM Wright

MONKES: a fast neoclassical code for the evaluation of monoenergetic transport coefficients in stellarator plasmas

Nuclear Fusion IOP Publishing 64:7 (2024) 076030

Authors:

FJ Escoto, JL Velasco, I Calvo, M Landreman, FI Parra

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

Physics of Plasmas AIP Publishing 31:3 (2024) 030702

Authors:

JF Parisi, AO Nelson, R Gaur, SM Kaye, FI Parra, JW Berkery, K Barada, C Clauser, AJ Creely, A Diallo, W Guttenfelder, JW Hughes, LA Kogan, A Kleiner, AQ Kuang, M Lampert, T Macwan, JE Menard, MA Miller

Robust stellarator optimization via flat mirror magnetic fields

Nuclear Fusion IOP Publishing 63:12 (2023) 126038-126038

Authors:

JL Velasco, I Calvo, E Sánchez, FI Parra

Abstract:

Abstract Stellarator magnetic configurations need to be optimized in order to meet all the required properties of a fusion reactor. In this work, it is shown that a flat-mirror quasi-isodynamic (QI) configuration (i.e. a QI configuration with sufficiently small radial variation of the mirror term) can achieve small radial transport of energy and good confinement of bulk and fast ions even if it is not very close to perfect omnigeneity, and for a wide range of plasma scenarios, including low β and small radial electric field. This opens the door to constructing better stellarator reactors. On the one hand, they would be easier to design, as they would be robust against error fields. On the other hand, they would be easier to operate since, both during startup and steady-state operation, they would require less auxiliary power, and the heat loads on plasma-facing components caused by fast ion losses would be reduced to acceptable levels.

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