A V Dudkovskaia J W Connor D Dickinson P Hill K Imada S Leigh H R Wilson
A nonlinear 4-dimensional drift island theory derived in (Imada et al 2019 Nucl. Fusion 59 046016 and references therein) provides qualitative predictions of the plasma response to a stationary neoclassical tearing mode (NTM) magnetic island in a low beta, large aspect ratio tokamak plasma. (Dudkovskaia et al 2021 Plasma Phys. Control. Fusion 63 05…
PublishedN.Osborne K.Verhaegh M.D.Bowden T.Wijkamp N.Lonigro P.Ryan E.Pawelec B.Lipschultz V.Soukhanovskii T.Biggelaar
High resolution D2 Fulcher band spectroscopy was used in the MAST-U divertors during Super-X and elongated conventional divertor density ramps with D2 fuelling from the mid-plane high-field side. In the Super-X case (density ramp from Greenwald fraction 0.12 to 0.24), the upper divertor showed ground state rotational tempe…
PreprintL. Horvath M. Maslov P.A. Schneider C.F. Maggi L.Frassinetti B. Lomanowski R.B. Morales D. Nina S. Saarelma J. Simpson G. Corrigan D.I. Refy M.Brix T. Pereira M. Vecsei JET Contributors
The relative role of particle transport and edge fuelling in setting the H-mode density pedestal is still a key open question [1]. Although reduced pedestal models have proven successful in predicting the pedestal pressure for a wide range of plasma scenarios [2,3,4], they lack a first principle based, predictive model for the edge density. Pred…
PreprintT. Gheorghiu F. Militello J. Juul Rasmussen
Shear flows in turbulent fluids have been known to act as transport barriers for some time. An example of a shear flow generating mechanism is the E×B shear in plasma, which has a substantial impact on the dynamics of magnetic confinement fusion devices. The influence of this may be seen in the scrape-off layer (SOL) where blobs or filaments may b…
Preprint PublishedH. J. C. Oliver S. E. Sharapov Z. Stancar M. Fitzgerald E. Tholerus B. N. Breizman M. Dreval J. Ferreira A. Figueiredo J. Garcia N. Hawkes D. L. Keeling P. G. Puglia P. Rodrigues A. Tinguely JET contributors
The Joint European Torus (JET) recently carried out an experimental campaign using a plasma consisting of both deuterium (D) and tritium (T). We observed a high-frequency mode using a reflectometer and an interferometer in a DT plasma heated with low power neutral beam injection, $P_{NBI} = 11.6$ $MW$. This mode were observed at a frequency $f =…
PreprintV.G. Kiptily P.J. Bonofiglo T. Craciunescu J. Eriksson M. Fitzgerald V. Goloborodko M. Nocente S. Menmuir M. Podestà M. Poradzinski D. Rigamonti Z. Stancar S.E. Sharapov H. Sun D.M. Taylor M. Tardocchi P. Beaumont F. Belli F.E. Cecil C.D. Challis R. Coelho M. Curuia R. Dumont J. Garcia M. Garcia-Munoz Z. Ghani Ye. Kazakov D. Keeling E. Lerche C.F. Maggi J. Mailloux P. Mantica M.J. Mantsinen D. Marocco C. Perez von Thun F. Rimini
The fusion reaction between deuterium and tritium, D(T,n)4He is the main source of energy in future thermonuclear reactors. Charged fusion products of this reaction, α-particles (4He-ions), are born with an average energy of 3.5 MeV. Transferring energy to the thermal plasma during their slowing down, the…
PreprintK. Kirov C. Challis E. De la Luna J. Eriksson D. Gallart J. Garcia M. Gorelenkova J. Hobirk P. Jacquet A. Kappatou Y. Kazakov D. Keeling D. King E. Lerche C. Maggi J. Mailloux P. Mantica M. Mantsinen M. Maslov S. Menmuir P. Siren Z. Stancar D. Van Eester JET Contributors
This work studies the interaction between Radio Frequency (RF) waves used for Ion Cyclotron Resonance Heating (ICRH) and the fast D and T Neutral Beam Injected (NBI) ions in DT plasma. The focus is on the effect of this interaction, also referred to as synergistic effects, on the fusion performance in the recent JET DTE2 campaign. Experimental d…
PreprintE. Parr K. G. McClements W. W. Heidbrink C. Michael G. Prechel J. Rivero-Rodriguez
A method for determining the fast-ion population density in magnetically-confined plasmas as a function of radius-pitch values, (R, Lambda), using ssNPA-signal and NBI power-output data has been developed. Oscillations in the NBI power output are replicated only in the active part of the ssNPA signal, allowing this to be separated…
PreprintM. Mantsinen P. Jacquet E. Lerche D. Gallart K. Kirov P. Mantica D. Taylor D. Van Eester M. Baruzzo I. Carvalho C. Challis E. Delabie E. De La Luna R. Dumont P. Dumortier J. Eriksson D. Frigione J. Garcia L. Garzotti C. Giroud R. Henriques J. Hobirk A. Kappatou Y. Kazakov D. Keeling D. King V. Kiptily M. Lenholm P. Lomas C. Lowry C. Maggi J. Mailloux M. Maslov S. Menmuir I. Monakhov R.B. Morales C. Noble M. Nocente A. Patel G. Pucella C. Reux D. Rigamonti F. Rimini A. Sheikh S. Silburn P. Siren E. Solano Z. Stancar M. Tardochi
The reference ion cyclotron resonance frequency (ICRF) heating schemes for ITER deuterium-tritium (D-T) plasmas at the full magnetic field of 5.3 T are second harmonic heating of tritium and 3He minority heating. The wave-particle resonance location for these schemes coincide and are central at a wave frequency of 53 MHz at 5.3T [1]. Experiments ha…
PublishedJ. Bland J. Varje N. Gorelenov M. Gryaznevich S.E. Sharapov J. Wood
This Letter reports on observed interplay between beam-driven modes of sweeping frequency (chirping modes) and transitions to the enhanced global confinement regime (H-mode) and back to the low confinement regime (L-mode) in the spherical tokamak ST40. The H-modes of plasma confinement are identified from decreased intensity of Dα signal and f…
Preprint Published