Publications by Felix Parra Diaz


Intuition for the radial penetration of flux surface shaping in tokamaks

PLASMA PHYSICS AND CONTROLLED FUSION 57 (2015) ARTN 035006

J Ball, FI Parra


Radial transport of toroidal angular momentum in tokamaks

PLASMA PHYSICS AND CONTROLLED FUSION 57 (2015) ARTN 075006

I Calvo, FI Parra


Equivalence of two different approaches to global delta f gyrokinetic simulations

PLASMA PHYSICS AND CONTROLLED FUSION 57 (2015) ARTN 054003

FI Parra, M Barnes


Intrinsic rotation in tokamaks: theory

PLASMA PHYSICS AND CONTROLLED FUSION 57 (2015) ARTN 045002

FI Parra, M Barnes


Flow damping in stellarators close to quasisymmetry

PLASMA PHYSICS AND CONTROLLED FUSION 57 (2015) ARTN 014014

I Calvo, FI Parra, J Luis Velasco, J Arturo Alonso


Dependence of intrinsic rotation reversals on collisionality in MAST

NUCLEAR FUSION 55 (2015) ARTN 032003

JC Hillesheim, FI Parra, M Barnes, NA Crocker, H Meyer, WA Peebles, R Scannell, A Thornton, MAST Team


Less constrained omnigeneous stellarators

NUCLEAR FUSION 55 (2015) ARTN 033005

FI Parra, I Calvo, P Helander, M Landreman


Poloidal asymmetries in edge pedestals on Alcator C-Mod

42nd European Physical Society Conference on Plasma Physics, EPS 2015 (2015)

C Theiler, RM Churchill, IH Hutchinson, B Lipschultz, PJ Catto, CS Chang, E Edlund, P Ennever, DR Ernst, R Hager, AE Hubbard, JW Hughes, M Landreman, ES Marmar, FI Parra, ML Reinke, JL Terry, JR Walk, D Whyte


Effect on Plasma Rotation of Lower Hybrid (LH) Waves in Alcator C-Mod

RADIOFREQUENCY POWER IN PLASMAS 1580 (2014) 398-401

JP Lee, M Barnes, RR Parker, JE Rice, FI Parra, PT Bonoli, ML Reinke


A current driven electromagnetic mode in sheared and toroidal configurations (vol 56, 035011, 2014)

PLASMA PHYSICS AND CONTROLLED FUSION 56 (2014) ARTN 129501

I Pusztai, PJ Catto, FI Parra, M Barnes


The effect of diamagnetic flows on turbulent driven ion toroidal rotation

PHYSICS OF PLASMAS 21 (2014) ARTN 056106

JP Lee, M Barnes, FI Parra, EA Belli, J Candy


Equivalence of two independent calculations of the higher order guiding center Lagrangian

PHYSICS OF PLASMAS 21 (2014) ARTN 104506

FI Parra, I Calvo, JW Burby, J Squire, H Qin


Optimizing stellarators for large flows

PLASMA PHYSICS AND CONTROLLED FUSION 56 (2014) ARTN 094003

I Calvo, FI Parra, J Arturo Alonso, J Luis Velasco


Erratum: Long-wavelength limit of gyrokinetics in a turbulent tokamak and its intrinsic ambipolarity (Plasma Phys. Control. Fusion (2012) 54 (115007))

Plasma Physics and Controlled Fusion 56 (2014)

I Calvo, FI Parra


Phase-space Lagrangian derivation of electrostatic gyrokinetics in general geometry (vol 53, 045001, 2011)

PLASMA PHYSICS AND CONTROLLED FUSION 56 (2014) ARTN 099501

FI Parra, I Calvo


Inboard and outboard radial electric field wells in the H- and I-mode pedestal of Alcator C-Mod and poloidal variations of impurity temperature

NUCLEAR FUSION 54 (2014) ARTN 083017

C Theiler, RM Churchill, B Lipschultz, M Landreman, DR Ernst, JW Hughes, PJ Catto, FI Parra, IH Hutchinson, ML Reinke, AE Hubbard, ES Marmar, JT Terry, JR Walk, AC-M Team


Reduction of core turbulence in I-mode plasmas in Alcator C-Mod

NUCLEAR FUSION 54 (2014) ARTN 083019

AE White, M Barnes, A Dominguez, M Greenwald, NT Howard, AE Hubbard, JW Hughes, DR Mikkelsen, FI Parra, ML Reinke, C Sung, J Walk, DG Whyte


Intrinsic momentum transport in up-down asymmetric tokamaks

PLASMA PHYSICS AND CONTROLLED FUSION 56 (2014) ARTN 095014

J Ball, FI Parra, M Barnes, W Dorland, GW Hammett, P Rodrigues, NF Loureiro


Overview of physics results from MAST towards ITER/DEMO and the MAST Upgrade

Nuclear Fusion 53 (2013)

H Meyer, IG Abel, RJ Akers, A Allan, SY Allan, LC Appel, O Asunta, M Barnes, NC Barratt, N Ben Ayed, JW Bradley, J Canik, P Cahyna, M Cecconello, CD Challis, IT Chapman, D Ciric, G Colyer, NJ Conway, M Cox, BJ Crowley, SC Cowley, G Cunningham, A Danilov, A Darke, MFM De Bock, G De Temmerman, RO Dendy, P Denner, D Dickinson, AY Dnestrovsky, Y Dnestrovsky, MD Driscoll, B Dudson, D Dunai, M Dunstan, P Dura, S Elmore, AR Field, G Fishpool, S Freethy, W Fundamenski, L Garzotti, YC Ghim, KJ Gibson, MP Gryaznevich, J Harrison, E Havlíčková, NC Hawkes, WW Heidbrink, TC Hender, E Highcock, D Higgins, P Hill, B Hnat, MJ Hole, J Horáček, DF Howell, K Imada, O Jones, E Kaveeva, D Keeling, A Kirk, M Kočan, RJ Lake, M Lehnen, HJ Leggate, Y Liang, MK Lilley, SW Lisgo, YQ Liu, B Lloyd, GP Maddison, J Mailloux, R Martin, GJ McArdle, KG McClements, B McMillan, C Michael, F Militello, P Molchanov, S Mordijck, T Morgan, AW Morris, DG Muir, E Nardon, V Naulin, G Naylor, AH Nielsen, MR O'Brien, T O'Gorman, S Pamela, FI Parra, A Patel, SD Pinches, MN Price, CM Roach, JR Robinson, M Romanelli, V Rozhansky

New diagnostic, modelling and plant capability on the Mega Ampère Spherical Tokamak (MAST) have delivered important results in key areas for ITER/DEMO and the upcoming MAST Upgrade, a step towards future ST devices on the path to fusion currently under procurement. Micro-stability analysis of the pedestal highlights the potential roles of micro-tearing modes and kinetic ballooning modes for the pedestal formation. Mitigation of edge localized modes (ELM) using resonant magnetic perturbation has been demonstrated for toroidal mode numbers n = 3, 4, 6 with an ELM frequency increase by up to a factor of 9, compatible with pellet fuelling. The peak heat flux of mitigated and natural ELMs follows the same linear trend with ELM energy loss and the first ELM-resolved Ti measurements in the divertor region are shown. Measurements of flow shear and turbulence dynamics during L-H transitions show filaments erupting from the plasma edge whilst the full flow shear is still present. Off-axis neutral beam injection helps to strongly reduce the redistribution of fast-ions due to fishbone modes when compared to on-axis injection. Low-k ion-scale turbulence has been measured in L-mode and compared to global gyro-kinetic simulations. A statistical analysis of principal turbulence time scales shows them to be of comparable magnitude and reasonably correlated with turbulence decorrelation time. Te inside the island of a neoclassical tearing mode allow the analysis of the island evolution without assuming specific models for the heat flux. Other results include the discrepancy of the current profile evolution during the current ramp-up with solutions of the poloidal field diffusion equation, studies of the anomalous Doppler resonance compressional Alfvén eigenmodes, disruption mitigation studies and modelling of the new divertor design for MAST Upgrade. The novel 3D electron Bernstein synthetic imaging shows promising first data sensitive to the edge current profile and flows. © 2013 IAEA, Vienna.


Changes in core electron temperature fluctuations across the ohmic energy confinement transition in Alcator C-Mod plasmas

NUCLEAR FUSION 53 (2013) ARTN 083010

C Sung, AE White, NT Howard, CY Oi, JE Rice, C Gao, P Ennever, M Porkolab, F Parra, D Mikkelsen, D Ernst, J Walk, JW Hughes, J Irby, C Kasten, AE Hubbard, MJ Greenwald, AC-M Team

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