159 results found
Henneberg SA, Cowley SC, Wilson HR, 2018, Filamentary plasma eruptions: Results using the non-linear ballooning model, CONTRIBUTIONS TO PLASMA PHYSICS, Vol: 58, Pages: 6-20, ISSN: 0863-1042
Cowley SC, 2016, The quest for fusion power, NATURE PHYSICS, Vol: 12, Pages: 384-386, ISSN: 1745-2473
Ham CJ, Cowley SC, Brochard G, et al., 2016, Explosive Ballooning Flux Tubes in Tokamaks
Tokamak stability to, potentially explosive, `ballooning' displacements ofelliptical magnetic flux tubes is examined in large aspect ratio equilibrium.Above a critical pressure gradient the energy stored in the plasma may belowered by finite (but not infinitesimal) displacements of such tubes(metastability). Above a higher pressure gradient, the linear stabilityboundary, such tubes are linearly and nonlinearly unstable. The flux tubedisplacement can be of the order of the pressure gradient scale length. Plasmatransport from displaced flux tubes may result in rapid loss of confinement.
Ham CJ, Cowley SC, Brochard G, et al., 2016, Nonlinear Stability and Saturation of Ballooning Modes in Tokamaks, PHYSICAL REVIEW LETTERS, Vol: 116, ISSN: 0031-9007
Cowley SC, Cowley B, Henneberg SA, et al., 2015, Explosive instability and erupting flux tubes in a magnetized plasma, PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, Vol: 471, ISSN: 1364-5021
Henneberg SA, Cowley SC, Wilson HR, 2015, Interacting filamentary eruptions in magnetised plasmas, PLASMA PHYSICS AND CONTROLLED FUSION, Vol: 57, ISSN: 0741-3335
Kunz MW, Schekochihin AA, Chen CHK, et al., 2015, Inertial-range kinetic turbulence in pressure-anisotropic astrophysical plasmas, JOURNAL OF PLASMA PHYSICS, Vol: 81, ISSN: 0022-3778
Rincon F, Schekochihin AA, Cowley SC, 2015, Non-linear mirror instability, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 447, Pages: L45-L49, ISSN: 0035-8711
Cole MDJ, Newton SL, Cowley SC, et al., 2014, Electromagnetic effects in the stabilization of turbulence by sheared flow, PLASMA PHYSICS AND CONTROLLED FUSION, Vol: 56, ISSN: 0741-3335
Abel IG, Cowley SC, 2013, Multiscale gyrokinetics for rotating tokamak plasmas: II. Reduced models for electron dynamics, NEW JOURNAL OF PHYSICS, Vol: 15, ISSN: 1367-2630
Abel IG, Plunk GG, Wang E, et al., 2013, Multiscale gyrokinetics for rotating tokamak plasmas: fluctuations, transport and energy flows, REPORTS ON PROGRESS IN PHYSICS, Vol: 76, ISSN: 0034-4885
Ghim Y-C, Schekochihin AA, Field AR, et al., 2013, Experimental Signatures of Critically Balanced Turbulence in MAST, PHYSICAL REVIEW LETTERS, Vol: 110, ISSN: 0031-9007
Ham CJ, Connor JW, Cowley SC, et al., 2013, The role of pressure flattening in calculating tearing mode stability, PLASMA PHYSICS AND CONTROLLED FUSION, Vol: 55, ISSN: 0741-3335
Meyer H, Abel IG, Akers RJ, et al., 2013, Overview of physics results from MAST towards ITER/DEMO and the MAST Upgrade, NUCLEAR FUSION, Vol: 53, ISSN: 0029-5515
Schekochihin AA, Highcock EG, Cowley SC, 2012, Subcritical fluctuations and suppression of turbulence in differentially rotating gyrokinetic plasmas, PLASMA PHYSICS AND CONTROLLED FUSION, Vol: 54, ISSN: 0741-3335
Barnes M, Parra FI, Highcock EG, et al., 2011, Turbulent Transport in Tokamak Plasmas with Rotational Shear, PHYSICAL REVIEW LETTERS, Vol: 106, ISSN: 0031-9007
Highcock EG, Barnes M, Parra FI, et al., 2011, Transport bifurcation induced by sheared toroidal flow in tokamak plasmas, PHYSICS OF PLASMAS, Vol: 18, ISSN: 1070-664X
Kunz MW, Schekochihin AA, Cowley SC, et al., 2011, A thermally stable heating mechanism for the intracluster medium: turbulence, magnetic fields and plasma instabilities, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 410, Pages: 2446-2457, ISSN: 0035-8711
Parra FI, Barnes M, Highcock EG, et al., 2011, Momentum Injection in Tokamak Plasmas and Transitions to Reduced Transport, PHYSICAL REVIEW LETTERS, Vol: 106, ISSN: 0031-9007
Rosin MS, Schekochihin AA, Rincon F, et al., 2011, A non-linear theory of the parallel firehose and gyrothermal instabilities in a weakly collisional plasma, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 413, Pages: 7-38, ISSN: 0035-8711
Schekochihin AA, Highcock EG, Cowley SC, 2011, Suppression of turbulence and subcritical fluctuations in differentially rotating gyrokinetic plasmas, PPCF, Vol: 54
Differential rotation is known to suppress linear instabilities in fusionplasmas. However, even in the absence of growing eigenmodes, subcriticalfluctuations that grow transiently can lead to sustained turbulence. Heretransient growth of electrostatic fluctuations driven by the parallel velocitygradient (PVG) and the ion temperature gradient (ITG) in the presence of aperpendicular ExB velocity shear is considered. The maximally simplified caseof zero magnetic shear is treated in the framework of a local shearing box.There are no linearly growing eigenmodes, so all excitations are transient. Themaximal amplification factor of initial perturbations and the correspondingwavenumbers are calculated as functions of q/\epsilon (=safety factor/aspectratio), temperature gradient and velocity shear. Analytical results arecorroborated and supplemented by linear gyrokinetic numerical tests. Forsufficiently low values of q/\epsilon (<7 in our model), regimes with fullysuppressed ion-scale turbulence are possible. For cases when turbulence is notsuppressed, an elementary heuristic theory of subcritical PVG turbulenceleading to a scaling of the associated ion heat flux with q, \epsilon, velocityshear and temperature gradient is proposed; it is argued that the transport ismuch less stiff than in the ITG regime.
Brown B, Forest C, Nornberg M, et al., 2010, An Experimental Plasma Dynamo Program for Investigations of Fundamental Processes in Heliophysics
Plasma experiments in laboratory settings offer unique opportunities toaddress fundamental aspects of the solar dynamo and magnetism in the solaratmosphere. We argue here that ground-based laboratory experiments have directconnections to NASA based missions and NSF programs, and that a smallinvestment in laboratory heliophysics may have a high payoff. We advocate forbroad involvement in community-scale plasma experiments.
Cowley S, 2010, Hot fusion, PHYSICS WORLD, Vol: 23, Pages: 46-51, ISSN: 0953-8585
Highcock EG, Barnes M, Schekochihin AA, et al., 2010, Transport Bifurcation in a Rotating Tokamak Plasma, PHYSICAL REVIEW LETTERS, Vol: 105, ISSN: 0031-9007
Newton SL, Cowley SC, Loureiro NF, 2010, Understanding the effect of sheared flow on microinstabilities, PLASMA PHYSICS AND CONTROLLED FUSION, Vol: 52, ISSN: 0741-3335
Schekochihin AA, Cowley SC, Rincon F, et al., 2010, Magnetofluid dynamics of magnetized cosmic plasma: firehose and gyrothermal instabilities, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 405, Pages: 291-300, ISSN: 0035-8711
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