Felix Ignacio Parra Diaz

2025

Effect of energetic ions on edge-localized modes in tokamak plasmas

the ASDEX Upgrade team & the EUROfusion MST1 team, Jan 2025, In: Nature Physics. 21, 1, p. 43-51 9 p.

Research output: Contribution to journal › Article › peer-review

Open Access

Measurement of Zero-Frequency Fluctuations Generated by Coupling between Alfvén Modes in the JET Tokamak

(the JET Contributors and the EUROfusion Tokamak Exploitation Team), Mar 7 2025, In: Physical review letters. 134, 9, 095103.

Research output: Contribution to journal › Article › peer-review

Open Access

Observation of bi-directional global Alfvén eigenmodes in the MAST-U tokamak

the MAST-U Team, Jan 1 2025, In: Nuclear Fusion. 65, 1, 016043.

Research output: Contribution to journal › Article › peer-review

Open Access

2024

Density profiles in stellarators: an overview of particle transport, fuelling and profile shaping studies at TJ-II

Alonso, J. A., Alegre, D., Alonso, J., Antón, R., Arias-Camisón, A., Ascasíbar, E., Baciero, A., Barcala, J. M., Barnes, M., Blanco, E., Bueno, L., Bustos, A., Cabrera, S., de la Cal, E., Calvo, I., Cappa, A., Carralero, D., Carrasco, R., Carreras, B. & Castro, R. & 94 others, de Castro, A., Cebrián, L., Chamorro, M., Chmyga, A. A., Colino, P., Duque, J., Escoto, F. J., Estrada, T., Fernández, A., Fraguas, J., Fontdecaba, J. M., Gabriel, A., García, L., García-Cortés, I., García-Gómez, R., García-Regaña, J. M., Godino-Sedano, G., Gómez-Manchón, J., González, A., González-Jerez, A., Guisse, V., Hernández-Sánchez, J., Hernanz, J., Hidalgo, C., Ivanova, P., Jiménez-Denche, A., Jiménez-Rey, D., Kocsis, G., Koepke, M., Kozachek, A. S., Lapayese, F., Liniers, M., López, D., López-Bruna, D., López-Miranda, B., de la Luna, E., Maragkoudakis, E., Martín-Díaz, F., Martín-Gómez, G., Martínez-Fernández, J., McCarthy, K. J., Medina, F., Medina-Roque, D., Medrano, M., Méndez, P., Miguel, F. J., van Milligen, B., Molinero, A., Motojima, G., Mulas, S., Navarro, M., Nedzelskiy, I., Nuñez, R., Ochando, M., Oyarzábal, E., de Pablos, J. L., Palomares, F., Panadero, N., Parra, F. I., Pastor, C., Pastor, I., de la Peña, A., Peralta, R., Pereira, A., Pons-Villalonga, P., Portas, A. B., Poveda, E., Ramos, F. J., Rattá, G. A., Redondo, M., Reynoso, C., Rincón, E., de la Riva, J., Rodríguez-Fernández, C., Ros, A., Sánchez, E., Sánchez, J., Sánchez-Sarabia, E., Sebastián, J. A., Solano, E. R., Soleto, A., Szepesi, T., Tabarés, F. L., Tafalla, D., Takahashi, H., Tamura, N., Thienpondt, H., Tolkachev, A., Tribaldos, V., Unamuno, R., Varela, J., Vega, J., Velasco, J. L. & Voldiner, I., Nov 1 2024, In: Nuclear Fusion. 64, 11, 112018.

Research output: Contribution to journal › Article › peer-review

Open Access

2 Scopus citations

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

Podavini, L., Zocco, A., García-Regaña, J. M., Barnes, M., Parra, F. I., Mishchenko, A. & Helander, P., Oct 16 2024, In: Journal of Plasma Physics. 90, 4, 905900414.

Research output: Contribution to journal › Article › peer-review

Open Access

4 Scopus citations

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., Mar 1 2024, In: Physics of Plasmas. 31, 3, 030702.

Research output: Contribution to journal › Article › peer-review

Open Access

6 Scopus citations

Kinetic-ballooning-limited pedestals in spherical tokamak plasmas

Parisi, J. F., Guttenfelder, W., Nelson, A. O., Gaur, R., Kleiner, A., Lampert, M., Avdeeva, G., Berkery, J. W., Clauser, C., Curie, M., Diallo, A., Dorland, W., Kaye, S. M., McClenaghan, J. & Parra, F. I., May 2024, In: Nuclear Fusion. 64, 5, 054002.

Research output: Contribution to journal › Article › peer-review

Open Access

8 Scopus citations

Linearised Fokker-Planck collision model for gyrokinetic simulations

von Boetticher, A., Parra, F. I. & Barnes, M., Oct 1 2024, In: Plasma Physics and Controlled Fusion. 66, 10, 105016.

Research output: Contribution to journal › Article › peer-review

Open Access

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

Escoto, F. J., Velasco, J. L., Calvo, I., Landreman, M. & Parra, F. I., Jul 2024, In: Nuclear Fusion. 64, 7, 076030.

Research output: Contribution to journal › Article › peer-review

Open Access

3 Scopus citations

Piecewise Omnigenous Stellarators

Velasco, J. L., Calvo, I., Escoto, F. J., Sánchez, E., Thienpondt, H. & Parra, F. I., Nov 1 2024, In: Physical review letters. 133, 18, 185101.

Research output: Contribution to journal › Article › peer-review

Open Access

3 Scopus citations

Reduction or Enhancement of Stellarator Turbulence by Impurities

García-Regaña, J. M., Calvo, I., Parra, F. I. & Thienpondt, H., Sep 6 2024, In: Physical review letters. 133, 10, 105101.

Research output: Contribution to journal › Article › peer-review

Open Access

2 Scopus citations

Sheath constraints on turbulent magnetised plasmas

Geraldini, A., Brunner, S. & Parra, F. I., Oct 1 2024, In: Plasma Physics and Controlled Fusion. 66, 10, 105021.

Research output: Contribution to journal › Article › peer-review

Open Access

2023

A phase-shift-periodic parallel boundary condition for low-magnetic-shear scenarios

St-Onge, D. A., Barnes, M. & Parra, F. I., Jan 1 2023, In: Plasma Physics and Controlled Fusion. 65, 1, 015016.

Research output: Contribution to journal › Article › peer-review

Open Access

1 Scopus citations

Isotope effects on intrinsic rotation in hydrogen, deuterium and tritium plasmas

JET Contributors, Apr 2023, In: Nuclear Fusion. 63, 4, 044002.

Research output: Contribution to journal › Article › peer-review

Open Access

6 Scopus citations

Merging of the superbanana plateau and transport regimes in nearly quasisymmetric stellarators

Catto, P. J., Tolman, E. A. & Parra, F. I., Feb 19 2023, In: Journal of Plasma Physics. 89, 1, 2200130.

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Neoclassical transport in strong gradient regions of large aspect ratio tokamaks

Trinczek, S., Parra, F. I., Catto, P. J., Calvo, I. & Landreman, M., May 25 2023, In: Journal of Plasma Physics. 89, 3, 905890304.

Research output: Contribution to journal › Article › peer-review

Open Access

2 Scopus citations

New linear stability parameter to describe low-β electromagnetic microinstabilities driven by passing electrons in axisymmetric toroidal geometry

Hardman, M. R., Parra, F. I., Patel, B. S., Roach, C. M., Ruiz Ruiz, J., Barnes, M., Dickinson, D., Dorland, W., Parisi, J. F., St-Onge, D. & Wilson, H., Apr 2023, In: Plasma Physics and Controlled Fusion. 65, 4, 045011.

Research output: Contribution to journal › Article › peer-review

Open Access

7 Scopus citations

Nonlinear second order electromagnetic gyrokinetic theory for a tokamak plasma

Dudkovskaia, A. V., Wilson, H. R., Connor, J. W., Dickinson, D. & Parra, F. I., Apr 2023, In: Plasma Physics and Controlled Fusion. 65, 4, 045010.

Research output: Contribution to journal › Article › peer-review

Open Access

7 Scopus citations

Robust stellarator optimization via flat mirror magnetic fields

Velasco, J., Calvo, I., Sánchez, E. & Parra, F., Dec 2023, In: Nuclear Fusion. 63, 12, 126038.

Research output: Contribution to journal › Article › peer-review

Open Access

11 Scopus citations

2022

A novel approach to radially global gyrokinetic simulation using the flux-tube code stella

St-Onge, D. A., Barnes, M. & Parra, F. I., Nov 1 2022, In: Journal of Computational Physics. 468, 111498.

Research output: Contribution to journal › Article › peer-review

Open Access

5 Scopus citations

ASCOT5 simulations of neutral beam heating and current drive in the TJ-II stellarator

Mulas, S., Cappa, Kontula, J., López-Bruna, D., Calvo, I., Parra, F. I., Liniers, M., Kurki-Suonio, T. & Mantsinen, M., Oct 2022, In: Nuclear Fusion. 62, 10, 106008.

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Beam model of Doppler backscattering

Hall-Chen, V. H., Parra, F. I. & Hillesheim, J. C., Sep 2022, In: Plasma Physics and Controlled Fusion. 64, 9, 095002.

Research output: Contribution to journal › Article › peer-review

Open Access

18 Scopus citations

Can a monotonic electrostatic potential exist in a Debye sheath at a sufficiently shallow magnetic field angle?

Geraldini, A., Ewart, R. J., Parra, F. I. & Brunner, S., 2022.

Research output: Contribution to conference › Paper › peer-review

Electrostatic gyrokinetic simulations in Wendelstein 7-X geometry: benchmark between the codes stella and GENE

González-Jerez, A., Xanthopoulos, P., García-Regaña, J. M., Calvo, I., Alcusón, J., Bañón Navarro, A., Barnes, M., Parra, F. I. & Geiger, J., Jun 10 2022, In: Journal of Plasma Physics. 88, 3, 905880310.

Research output: Contribution to journal › Article › peer-review

Open Access

9 Scopus citations

Enhanced performance in fusion plasmas through turbulence suppression by megaelectronvolt ions

JET Contributors, Jul 1 2022, In: Nature Physics. 18, 7, p. 776-782 7 p.

Research output: Contribution to journal › Article › peer-review

65 Scopus citations

Extended electron tails in electrostatic microinstabilities and the nonadiabatic response of passing electrons

Hardman, M. R., Parra, F. I., Chong, C., Adkins, T., Anastopoulos-Tzanis, M. S., Barnes, M., Dickinson, D., Parisi, J. F. & Wilson, H., May 2022, In: Plasma Physics and Controlled Fusion. 64, 5, 055004.

Research output: Contribution to journal › Article › peer-review

Open Access

13 Scopus citations

Finite orbit width effects in large aspect ratio stellarators

D'Herbemont, V., Parra, F. I., Calvo, I. & Velasco, J. L., Oct 17 2022, In: Journal of Plasma Physics. 88, 5, 905880507.

Research output: Contribution to journal › Article › peer-review

Open Access

8 Scopus citations

Gyrokinetic electrostatic turbulence close to marginality in the Wendelstein 7-X stellarator

Zocco, A., Podavini, L., Garcìa-Regaña, J. M., Barnes, M., Parra, F. I., Mishchenko, A. & Helander, P., Jul 2022, In: Physical Review E. 106, 1, L013202.

Research output: Contribution to journal › Article › peer-review

Open Access

10 Scopus citations

Interpreting radial correlation Doppler reflectometry using gyrokinetic simulations

Ruiz Ruiz, J., Parra, F. I., Hall-Chen, V. H., Christen, N., Barnes, M., Candy, J., Garcia, J., Giroud, C., Guttenfelder, W., Hillesheim, J. C., Holland, C., Howard, N. T., Ren, Y. & White, A. E., May 2022, In: Plasma Physics and Controlled Fusion. 64, 5, 055019.

Research output: Contribution to journal › Article › peer-review

Open Access

14 Scopus citations

Isotope Effects on Intrinsic Toroidal Rotation and Rotation Reversals

JET Contributors, 2022.

Research output: Contribution to conference › Paper › peer-review

Overview of the TJ-II stellarator research programme towards model validation in fusion plasmas

Hidalgo, C., Ascasíbar, E., Alegre, D., Alonso, A., Alonso, J., Antón, R., Baciero, A., Baldzuhn, J., Barcala, J. M., Barrera, L., Blanco, E., Botija, J., Bueno, L., Cabrera, S., De Castro, A., Cal, E. D. L., Calvo, I., Cappa, A., Carralero, D. & Carrasco, R. & 115 others, Carreras, B., Castro, R., De Castro, A., Cebrián, L., Chmyga, A. A., Chamorro, M., Colino, P., De Aragón, F., Drabinskiy, M., Duque, J., Eliseev, L., Escoto, F. J., Estrada, T., Ezzat, M., Fraguas, F., Fernández-Ruiz, D., Fontdecaba, J. M., Gabriel, A., Gadariya, D., García, L., García-Cortés, I., García-Gómez, R., García-Regaña, J. M., González-Jerez, A., Grenfell, G., Guasp, J., Guisse, V., Hernández-Sánchez, J., Hernanz, J., Jiménez-Denche, A., Khabanov, P., Kharchev, N., Kleiber, R., Koechl, F., Kobayashi, T., Kocsis, G., Koepke, M., Kozachek, A. S., Krupnik, L., Lapayese, F., Liniers, M., Liu, B., López-Bruna, D., López-Miranda, B., Losada, U., Luna, E. D. L., Lysenko, S. E., Martín-Díaz, F., Martín-Gómez, G., Maragkoudakis, E., Martínez-Fernández, J., McCarthy, K. J., Medina, F., Medrano, M., Melnikov, A. V., Méndez, P., Miguel, F. J., Van Milligen, B., Molinero, A., Motojima, G., Mulas, S., Narushima, Y., Navarro, M., Nedzelskiy, I., Nuñez, R., Ochando, M., Ohshima, S., Oyarzábal, E., De Pablos, J. L., Palomares, F., Panadero, N., Papoušek, F., Parra, F., Pastor, C., Pastor, I., Peña, A. D. L., Peralta, R., Pereira, A., Pons-Villalonga, P., Polaino, H., Portas, A. B., Poveda, E., Ramos, F. J., Rattá, G. A., Redondo, M., Reynoso, C., Rincón, E., Rodríguez-Fernández, C., Rodríguez-Rodrigo, L., Ros, A., Sánchez, E., Sánchez, J., Sánchez-Sarabia, E., Satake, S., Sebastián, J. A., Sharma, R., Smith, N., Silva, C., Solano, E. R., Soleto, A., Spolaore, M., Szepesi, T., Tabarés, F. L., Tafalla, D., Takahashi, H., Tamura, N., Thienpondt, H., Tolkachev, A., Unamuno, R., Varela, J., Vega, J., Velasco, J. L., Voldiner, I., Yamamoto, S. & The Tj-Ii Team, T.-I. T., Apr 2022, In: Nuclear Fusion. 62, 4, 042025.

Research output: Contribution to journal › Review article › peer-review

Open Access

18 Scopus citations

Power balance analysis at the L-H transition in JET-ILW NBI-heated deuterium plasmas

JET Contributors, Dec 2022, In: Plasma Physics and Controlled Fusion. 64, 12, 124004.

Research output: Contribution to journal › Article › peer-review

Open Access

7 Scopus citations

Sheath collapse at critical shallow angle due to kinetic effects

Ewart, R. J., I Parra, F. & Geraldini, A., Jan 2022, In: Plasma Physics and Controlled Fusion. 64, 1, 015010.

Research output: Contribution to journal › Article › peer-review

Open Access

3 Scopus citations

The power threshold of H-mode access in mixed hydrogen-tritium and pure tritium plasmas at JET with ITER-like wall

Birkenmeier, G., Solano, E. R., Lerche, E., Taylor, D., Gallart, D., Mantsinen, M. J., Delabie, E., Carvalho, I. S., Carvalho, P., Pawelec, E., Hillesheim, J. C., Parra Diaz, F., Silva, C., Aleiferis, S., Bernardo, J., Boboc, A., Douai, D., Litherland-Smith, E., Henriques, R. & Kirov, K. K. & 7 others, Maggi, C. F., Mailloux, J., Maslov, M., Rimini, F. G., Silburn, S. A., Sirén, P. & Weisen, H., Aug 2022, In: Nuclear Fusion. 62, 8, 086005.

Research output: Contribution to journal › Article › peer-review

Open Access

14 Scopus citations

Three-dimensional inhomogeneity of electron-temperature-gradient turbulence in the edge of tokamak plasmas

JET Contributors, Aug 2022, In: Nuclear Fusion. 62, 8, 086045.

Research output: Contribution to journal › Article › peer-review

Open Access

17 Scopus citations

Validating and optimizing mismatch tolerance of Doppler backscattering measurements with the beam model (invited)

Hall-Chen, V. H., Damba, J., Parra, F. I., Pratt, Q. T., Michael, C. A., Peng, S., Rhodes, T. L., Crocker, N. A., Hillesheim, J. C., Hong, R., Ni, S., Peebles, W. A., Png, C. E. & Ruiz Ruiz, J., Oct 1 2022, In: Review of Scientific Instruments. 93, 10, 103536.

Research output: Contribution to journal › Article › peer-review

Open Access

7 Scopus citations

2021

A model for the fast evaluation of prompt losses of energetic ions in stellarators

Velasco, J. L., Calvo, I., Mulas, S., Sánchez, E., Parra, F. I. & Cappa, A., Nov 2021, In: Nuclear Fusion. 61, 11, 116059.

Research output: Contribution to journal › Article › peer-review

Open Access

19 Scopus citations

Continuous-in-time approach to flow shear in a linearly implicit local δf gyrokinetic code

Christen, N., Barnes, M. & Parra, F. I., Apr 2021, In: Journal of Plasma Physics. 87, 2, 905870230.

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Fast simulations for large aspect ratio stellarators with the neoclassical code KNOSOS

Velasco, J. L., Calvo, I., Parra, F. I., D'herbemont, V., Smith, H. M., Carralero, D. & Estrada, T., Nov 2021, In: Nuclear Fusion. 61, 11, 116013.

Research output: Contribution to journal › Article › peer-review

Open Access

15 Scopus citations

Gyrokinetic simulations in stellarators using different computational domains

Sánchez, E., García-Regana, J. M., Banón Navarro, A., Proll, J. H. E., Mora Moreno, C., González-Jerez, A., Calvo, I., Kleiber, R., Riemann, J., Smoniewski, J., Barnes, M. & Parra, F. I., Nov 2021, In: Nuclear Fusion. 61, 11, 116074.

Research output: Contribution to journal › Article › peer-review

Open Access

11 Scopus citations

Interpreting radial correlation doppler reflectometry using gyrokinetic simulations

JET Contributors, 2021, 47th EPS Conference on Plasma Physics, EPS 2021. European Physical Society (EPS), p. 305-308 4 p. (47th EPS Conference on Plasma Physics, EPS 2021; vol. 2021-June).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

L-H transition threshold studies in helium plasmas at JET

Solano, E. R., Birkenmeier, G., Delabie, E., Silva, C., Hillesheim, J. C., Boboc, A., Carvalho, I. S., Carvalho, P., Chernyshova, M., Craciunescu, T., De La Luna, E., Fontdecaba, J. M., Henriques, R., Jacquet, P., Jepu, I., Kappatou, A., King, D., Lennholm, M., Lerche, E. & Litherland-Smith, E. & 14 others, Loarte, A., Maslov, M., Parra Diaz, F., Parail, V., Pawelec, E., Rimini, F. G., Shaw, A., Siren, P., Szepesi, G., Štancar, Tholerus, E., Vartanian, S., Viola, B. & Weisen, H., Dec 2021, In: Nuclear Fusion. 61, 12, 124001.

Research output: Contribution to journal › Article › peer-review

Open Access

19 Scopus citations

Turbulent impurity transport simulations in Wendelstein 7-X plasmas

Garcia-Regaña, J. M., Barnes, M., Calvo, I., Parra, F. I., Alcuson, J. A., Davies, R., Gonzalez-Jerez, A., Mollen, A., Sanchez, E., Velasco, J. L. & Zocco, A., 2021, (Accepted/In press) In: Journal of Plasma Physics. 855870103.

Research output: Contribution to journal › Article › peer-review

Open Access

25 Scopus citations

Turbulent transport of impurities in 3D devices

García-Regaa, J. M., Barnes, M., Calvo, I., González-Jerez, A., Thienpondt, H., Sánchez, E., Parra, F. I. & St.-Onge, D. A., Nov 2021, In: Nuclear Fusion. 61, 11, 116019.

Research output: Contribution to journal › Article › peer-review

Open Access

16 Scopus citations

2020

Erratum: Electromagnetic zonal flow residual responses (Journal of Physical Chemistry DOI: 10.1017/S0022377817000472)

Catto, P. J., Parra, F. I. & Pusztai, I., 2020, (Accepted/In press) In: Journal of Plasma Physics. 945860201.

Research output: Contribution to journal › Comment/debate › peer-review

Open Access

Full wave simulation of RF waves in cold plasma with the stabilized open-source finite element tool ERMES

JET Contributors, Sep 16 2020, 23rd Topical Conference on Radiofrequency Power in Plasmas. Bonoli, P. T., Pinsker, R. I. & Wang, X. (eds.). American Institute of Physics Inc., 50009. (AIP Conference Proceedings; vol. 2254).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Open Access

4 Scopus citations

Impact of main ion pressure anisotropy on stellarator impurity transport

Calvo, I., Parra, F. I., Velasco, J. L. & García-Regaña, J. M., 2020, In: Nuclear Fusion. 60, 1, 016035.

Research output: Contribution to journal › Article › peer-review

Open Access

7 Scopus citations

KNOSOS: A fast orbit-averaging neoclassical code for stellarator geometry

Velasco, J. L., Calvo, I., Parra, F. I. & García-Regaña, J. M., Oct 1 2020, In: Journal of Computational Physics. 418, 109512.

Research output: Contribution to journal › Article › peer-review

Open Access

27 Scopus citations

Toroidal and slab ETG instability dominance in the linear spectrum of JET-ILW pedestals

Parisi, J. F., Parra, F. I., Roach, C. M., Giroud, C., Dorland, W., Hatch, D. R., Barnes, M., Hillesheim, J. C., Aiba, N., Ball, J., Ivanov, P. G. & Contributors, J. E. T., Dec 2020, In: Nuclear Fusion. 60, 12, 126045.

Research output: Contribution to journal › Article › peer-review

Open Access

53 Scopus citations

Zonally dominated dynamics and Dimits threshold in curvature-driven ITG turbulence

Ivanov, P. G., Schekochihin, A. A., Dorland, W., Field, A. R. & Parra, F. I., 2020, (Accepted/In press) In: Journal of Plasma Physics. 855860502.

Research output: Contribution to journal › Article › peer-review

Open Access

27 Scopus citations

Felix Ignacio Parra Diaz

Research output

Search results