Profile

Career

BSc (Durham), PhD (Cambridge)

Summary of expertise

• Magnetic confinement fusion
• Theory of fusion plasmas

Previous posts

1988-2005: Research Scientist, UKAEA Culham

Honours

Fellow of the Institute of Physics

International roles

• Chair of International Tokamak Physics Activity (ITPA) Pedestal Group
• Member of MAST Programme Advisory Committee

Departmental roles

Chair, Departmental Research Committee

University roles

• Director, York Plasma Institute
• Director, Fusion Doctoral Training Network

Research

Overview

Research group - Plasma Physics and Fusion

Research interests

• Magnetic Confinement Fusion
• Theory of fusion plasmas

Research profile

My main area of research is in the theory and computational modelling of magnetically confined plasmas, with a particular emphasis on tokamak plasmas for fusion energy applications. My interests can be broadly categorised into plasma turbulence and instabilities, especially the key issues for ITER (www.iter.org).

Fusion is the process that powers the stars and, indeed, our own star the Sun. If we can reproduce that process here on Earth it will provide effectively limitless energy in a safe, sustainable way, with no greenhouse gas emissions and relatively little waste material. The process relies on the fusion of two isotopes of hydrogen, called deuterium and tritium. It requires the fuel to be heated to one hundred million degrees Kelvin. At such a temperature, the deuterium and tritium exist as an ionised gas, called a plasma.  In a tokamak, this plasma is confined in a toroidal (or doughnut) shape by a system of magnetic fields. A large amount of the research for fusion focuses on the properties of this magnetised plasma: a complex, subtle and, therefore, interesting field of science. Magnetised plasmas also exist in nature: the Sun, the solar wind and the Northern Lights are just some examples. They are also used in industrial processes. Understanding the physics of magnetised plasmas clearly has a broad range of interesting, important applications.

One of the big challenges for tokamak plasma science is understanding a sequence of repetitive plasma eruptions, called Edge Localised Modes, or ELMs. As the name suggests, these originate from close to the plasma boundary. An insulating layer can form there, which is beneficial for approaching the extreme conditions required for fusion to occur in the plasma core. However, the steep pressure gradient and strong current density that form in this layer provide free energy to drive a particularly violent instability called the peeling-ballooning mode.  We developed the theory for this instability and proposed it as a mechanism to drive ELMs in the late 90’s. In collaboration with Phil Snyder of General Atomics in San Diego, I developed the ELITE code to provide quantitative predictions of the plasma stability in the insulating layer, which is called “the pedestal”.  This is now used for analysing the pedestal stability to understand how and when the ELM is triggered on tokamaks world-wide, including JET, MAST, DIII-D, Alcator C-Mod, NSTX, JT-60U and ASDEX-Upgrade.

I am interested in the nonlinear theory of ballooning modes, to understand how the ELMs develop. Our nonlinear magneto-hydrodynamic (MHD) theory predicts that ELMs do not eject a uniform shell of plasma, but rather expel filaments of heat and particles very violently. They were predicted to appear in a manner similar to solar flares, but the filamentary structures would only last fifty microseconds, so observing them is a challenge. Nevertheless, experimentalists have employed high resolution imaging systems to identify the filaments, and now there is very clear evidence for them, providing at least qualitative agreement with the theory. The violence of the eruptions is predicted by the theory to be a consequence of a quadratic nonlinearity that leads to explosive growth (i.e. a finite time singularity).

The amount of fusion energy that a tokamak such as ITER will produce is determined to a large extent by the plasma turbulence that leads to losses of heat and particles. If turbulence can be understood and controlled, it would revolutionise the approach to fusion energy. The insulating, pedestal region at the plasma edge is of particular interest because the turbulence is quenched there. Indeed, it is believed that it is the quenching of the turbulence that provides the insulating layer. If we can understand the mechanism of this turbulence quenching, then perhaps we can develop ways to make the insulating region wider, greatly increasing the core pressure and hence the fusion power. Strong plasma flows are observed in the pedestal region, and these are thought to lie behind the quench mechanism. To explore this, I am particularly interested in the effect of flows on the fine scale micro-instabilities that are believed to stir up the plasma and cause the turbulence. There are interesting subtleties associated with understanding micro-instabilities in a doubly periodic system, such as the toroidal plasma of a tokamak. How to deal with these subtleties is not yet understood, I would argue.

I am also interested in turbulence simulations. These involve the use of state of the art computer codes on some of the world’s largest computers.

There is another kind of instability that exists in the core of the tokamak, called a neoclassical tearing mode, or NTM. While it is not as violent (usually) as the ELM discussed above, it is still a concern for ITER because it causes a drop in the core plasma pressure, and therefore a reduction in the achievable fusion power. The instability arises because of a filamentation of the current density that flows in the tokamak plasma. This modifies the confining magnetic field over a narrow region in the vicinity of the filamentation. If the region affected by the NTM is narrower than 1-2cm (typically), then the plasma is observed to heal the instability, and the filamentation is suppressed. We do not understand this mechanism (although we do have some ideas). When the affected region is larger, the temperature and density gradients are removed from that region, causing the drop in the core plasma pressure discussed above. In that situation, there is a positive feedback mechanism that amplifies the current filaments, causing the region affected by the NTM to grow, further amplifying the filaments, etc. The result is that a very large region of plasma can become affected by the instability, resulting in a large drop in the central pressure. We are particularly interested in understanding this threshold between when the plasma heals the filamentation, and when it amplifies it. This is important because on ITER, it is planned to use microwaves to drive localised currents in the plasma, focused to cancel the filamentation caused by the NTM. This would cause the NTM to shrink; if it shrinks to less than the 1-2cm threshold width, then the plasma will heal it. Key questions are how much microwave power is required to do this, and how localised must it be deposited in the plasma? If we can understand the threshold physics, then we can predict the threshold width of the region for ITER, and so quantify the microwave power required.

Construction of a proto-type fusion power station will require the verification of materials and components in a fusion neutron spectrum. Ideally, this requires a small, compact fusion neutron source. I am interested in whether such a neutron source can be developed based on the so-called spherical tokamak concept. Pioneered on the START spherical tokamak at Culham, the UK presently has a world-leading spherical tokamak called MAST. There are challenges, but it appears that it might be possible to design a fusion components test facility with a similar size to MAST, but with much higher heating power, magnetic field and current. A key issue is whether the plasma turbulence, referred to above, can be controlled.

Research group(s)

• Dr Koki Imada
• Mr Simon Myers
• Mr Peter Buxton
• Mr David Dickinson
• Ms Rachel McAdams

Publications

Full publications list

K J GIBSON, N BARRATT, I CHAPMAN, et al
New physics capabilities from the upgraded Thomson scattering diagnostic on MAST
Plas Phys and Contr Fusion 52 124041 (2010)

M J HOLE, H R WILSON, R ABEYSURIYA, et al
Ideal MHD stability of a spherical tokamak power plant and a component test facility
Plas Phys Contr Fusion 52 125005 (2010)

X Q XU, B DUDSON, P B SNYDER, et al
Nonlinear simulations of peeling-ballooning modes and anomalous electron viscosity and their role in edge localized mode crashes
Phys Rev Lett 105 175005 (2010)

M JAMES, H R WILSON and J W CONNOR
Modelling the effect of cross-field diffusion on tearing mode stability
Plas Phys Contr Fusion 51 124020 (2009)

C M ROACH, IG LABEL, RJ AKERS, et al
Gyrokinetic simulations of spherical tokomaks
Plas Phys Contr Fusion 51 124020 (2009)

H R WILSON, & J W CONNOR
The influence of magnetic fields on drift mode stability in magnetized plasma
Plas Phys Contr Fusion 51 115007 (2009)

H MEYER, R J AKERS, F ALLADIO, et el
Overview of results from MAST,
Nucl Fusion 49 104017 (2009)

K IMADA & H R WILSON
Influence of collision frequency on neoclassical polarization current
Plas Phys Contr Fusion 51 105010 (2009)

P B SNYDER, N AIBA, M BEURSKENS et el
Pedestal stability comparison and ITER pedestal prediction
Nucl Fusion 49 085035 (2009)

P B SNYDER, RJ GROEBNER, A W LEONARD et al
Development and validation of a predictive model for the pedestal heights
Phys Plasmas 16 056118 (2009)

A KIRK, T O'GORMA, S SAARELMA et al
Comparison of H-mode pedestal characteristics in MAST as a function of magnetic configuration and ELM type
Plas Phys Contr Fusion 51 065016 (2009)

N B AYED et al
Inter-ELM filaments and turbulent transport in the Mega-Amp Spherical Tokamak
Plas Phys Contr Fusion 51 035016 (2009)

R SCANNEL et al
Design of a new Nd-YAG Thomson scattering system for MAST
Rec Sci Instrum 79 10E730 (2008)

G M VOSS et al
Conceptual design of a component test facility based on the spherical tokomak
Fusion Engineering and Design 83 1648 (2008)

B D DUDSON et al
Experiments and simulation of edge turbulence and filaments in MAST
Plas Phys Contr Fusion 50 124012 (2008)

B LLOYD et al
Overview of results from MAST
Nuclear Fusion 47 S658 (2007)

P B SNYDER, K H BURRELL, H R WILSON, M S CHU, M E FENSTERMACHER, A W LEONARD, R A MOYER, T H OSBORNE, M UMANSKY, W P WEST AND X Q XU
Stability and dynamics of the edge pedestal in the low collisionality regime: physics mechanisms for steady-state ELM-free operation
Nucl. Fusion 47 961-968 (2007) (8 pages)

A KIRK et al
Evolution o fthe pedestal on MAST an dthe implications for ELM power loadings
Plas Phys Contr Fusion 49 1259 (2007)

D A BATCHELOR, et al
Simulation of fusion plasmas: current status and future direction
Plasma Sci Technol 9 312 (2007)

S SAARELMA et al
MHD stability analysis of ELMs in MAST
Plasma Phys Contr Fusion 49 31 (2007)

A BECOULET, P STRAND, H WILSON, M ROMANELLI AND L G ERIKSSON
The way towards thermonuclear fusion simulators
Comput. Phys. Commun. 177 55-59 (2007) (5 pages)

E J DOYLE, W A HOULBERG, Y KAMADA, V MUKHOVATOV, T H OSBORNE, A POLEVOI, G BATEMAN, J W CONNOR, J G CORDEY, T FUJITA, X GARBET, T S HAHM, L D HORTON, A E HUBBARD, F IMBEAUX, F JENKO, J E KINSEY, Y KISHIMOTO, J LI, T C LUCE, Y MARTIN, M OSSIPENKO, V PARAIL, A PEETERS, T L RHODES, J E RICE, C M ROACH, V ROZHANSKY, F RYTER, G SAIBENE, R SARTORI, A C C SIPS, J A SNIPES, M SUGIHARA, E J SYNAKOWSKI, H TAKENAGA, T TAKIZUKA, K THOMSEN, M R WADE, H R WILSON
Chapter 2: Plasma confinement and transport
Nucl. Fusion 47 S18-S127 (2007) (110 pages)

A W LEONARD, N ASAKURA, J A BOEDO, M BECOULET, G F COUNSELL, T EICH, W FUNDAMENSKI, A HERRMANN, L D HORTOU, Y KAMADA, A KIRK, B KURZAN, A LOARTE, J NEUHAUSER, I NUNES, N OYAMA, R A PITTS, G SAIBENE, C SILVA, P B SNYDER, H URANO, M R WADE, H R WILSON
Survey of Type I ELM dynamics measurements
Plasma Phys. Control. Fusion 48 A149-A162 (2006) (14 pages)

A KIRK, BEN N AYED, G COUNSELL, B DUDSON, T EICH, A HERRMANN, B KOCH, R MARTIN, A MEAKINS, S SAARELMA, R SCANNELL, S TALLENTS, M WALSH AND H R WILSON
Filament structures at the plasma edge on MAST
Plasma Phys. Control. Fusion 48 B433-B441 (2006) (9 pages)

M JAMES AND H R WILSON
Tearing mode stability in a sheared slab model of the tokamak plasma
Plasma Phys. Control. Fusion 48 1647-1659 (2006) (13 pages)

H R WILSON, S C COWLEY, A KIRK AND P B SNYDER
Magneto-hydrodynamic stability of the H-mode transport barrier as a model for edge localized modes: an overview
Plasma Phys. Control. Fusion 48 A71-A84 (2006) (14 pages)

A KIRK, B KOCH, R SCANNELL, H R WILSON, G COUNSELL, J DOWLING, A HERRMANN, R MARTIN AND M WALSH
Evolution of filament structures during edge-localized modes in the MAST tokamak
Phys. Rev. Lett. 96 185001 (2006) (4 pages)

H R WILSON
Neoclassical tearing modes
Fusion Sci. Technol. 49 155-163 (2006) (9 pages)

H. MEYER, H. R. WILSON, and others (12).
H-mode physics of near double null plasmas in MAST and its applications to other tokamaks.
Nuclear Fusion 46, 64-72 (2006).

A. W. MORRIS, H. R. WILSON, and others (8).
Spherical tokamaks, Present status and role in the development of fusion power.
Fusion Engineering Design 74, 67-75 (2005).

G. F. COUNSELL, H. R. WILSON, and others (73).
Overview of MAST results.
Nuclear Fusion 45, S157-S167 (2005).

A. J. WEBSTER, D. J. SZWER, AND H. R. WILSON.
The stability of ballooning modes in tokamaks with internal transport barriers.
Phys. Plasmas 12, 092502 (2005).

P. B. SNYDER, H. R. WILSON, AND X. Q. XU.
Progress in the peeling-ballooning model of edge localized modes, Numerical studies of nonlinear dynamics.
Phys. Plasmas 12, 056115 (2005).

M. J. HOLE, H. R. WILSON, and others (16).
Ideal MHD stability of the mega-ampere spherical tokamak.
Plasma Phys. Controlled Fusion 47, 581-613 (2005).

A. KIRK, H. R. WILSON, and others (16).
Structure of ELMs in MAST and the implications for energy deposition.
Plasma Phys. Controlled Fusion 47, 315-333 (2005).

B. LLOYD, H. R. WILSON, and others (69).
MAST and the impact of low aspect ratio on tokamak physics.
Plasma Phys. Controlled Fusion 46, B477-B494 (2004).

T. ONJUN, A. H. KRITZ, G. BATEMAN, V. PARAIL, H. R. WILSON, AND A. DNESTROVSKIJ.
Interplay between ballooning and peeling modes in simulations of the time evolution of edge localized modes.
Phys. Plasmas 12, 012506 (2005).

R. J. BUTTERY, H. R. WILSON, and others (20).
Stability at high performance in the MAST spherical tokamak.
Nuclear Fusion 44, 1027-1035 (2004).

H. R. WILSON and others (21).
Integrated plasma physics modelling for the Culham steady state spherical tokamak fusion power plant.
Nuclear Fusion 44, 917-929 (2004).

A. KIRK, H. R. WILSON, and others (10).
Spatial and temporal structure of edge-localized modes.
Phys. Rev. Lett. 92, 245002 (2004). [ external link ]

P. B. SNYDER, H. R. WILSON, T. H. OSBORNE, AND A. W. LEONARD.
Characterization of peeling-ballooning stability limits on the pedestal.
Plasma Phys. Controlled Fusion 46, A131-A141 (2004).

H. R. WILSON AND S. C. COWLEY.
Theory for explosive ideal magnetohydrodynamic instabilities in plasmas.
Phys. Rev. Lett. 92, 175006 (2004). [ external link ]

A. J. WEBSTER, H. R. WILSON, AND A. M. M. SCAIFE.
The role of flow shear in the ballooning stability of tokamak transport barriers.
Phys. Plasmas 11, 2135-2143 (2004).

A. J. WEBSTER AND H. R. WILSON.
Role of flow shear in the ballooning stability of tokamak transport barriers.
Phys. Rev. Lett. 92, 165004 (2004). [ external link ]

J-S LONROTH, V PARAIL, GHUYSMANS, et el
Predictive transport modelling and MHD stability analysis of mixed type I-II ELMy H mode JET plasmas
Plas Phys Contr Fusion 46, 551 (2004)

A. I. SMOLYAKOV, H. R. WILSON, M. OTTAVIANI, AND F. PORCELLI.
Ion sound effects on magnetic islands.
Plasma Phys. Controlled Fusion 46, L1-L6 (2004).

A. KIRK, H. R. WILSON, and others (15).
ELM characteristics in MAST.
Plasma Phys. Controlled Fusion 46, 551-572 (2004).

H. R. WILSON.
Neoclassical tearing modes.
Fusion Science Technology 45, 123-131 (2004).

P. B. SNYDER, H. R. WILSON, and others (10).
ELMs and constraints on the H-mode pedestal, peeling-ballooning stability calculation and comparison with experiment.
Nuclear Fusion 44, 320-328 (2004).

R. J. AKERS, H. R. WILSON, and others (46).
Transport and confinement in the mega ampere spherical tokamak (MAST) plasma.
Plasma Phys. Controlled Fusion 45, A175-A204 (2003).

STEVEN C COWLEY, HOWARD WILSON, OMAR HURRICANE & BRYAN FONG
Explosive instabilities: from solar flares to edge localized modes in tokomaks
Plas Phys Contr Fusion 45, A31 (2003)

M BECOULET, G HUYSMANS, Y SARAZIN, el el
Edge localized mode physics and operational aspects in tokomaks
Plasma Phys Contr Fusion 45, A93 (2003)

K. H. BURRELL, H. R. WILSON, and others (245).
Overview of recent experimental results from the DIII-D advanced tokamak program.
Nuclear Fusion 43, 1555-1569 (2003).

B. LLOYD, H. R. WILSON, and others (63).
Overview of recent experimental results on MAST.
Nuclear Fusion 43, 1665-1673 (2003).

E S MARMAR, B BAI, R L BOIVIN, et al
Overview of recent Alcator C-mod research
Nucl Fusion 43, 1610 (2003)

G. F. COUNSELL, H. R. WILSON, and others (10).
Exhaust, ELM, and halo physics using the MAST tokamak.
Nuclear Fusion 43, 1197-1203 (2003).

A. D. TURNBULL, H. R. WILSON, and others (14).
Edge localized modes in DIII-D high performance discharges.
Plasma Phys. Controlled Fusion 45, 1845-1872 (2003).

P. B. SNYDER AND H. R. WILSON.
Ideal magnetohydrodynamic constraints on the pedestal temperature in tokamaks.
Plasma Phys. Controlled Fusion 45, 1671-1687 (2003).

R. J. LAHAYE, C. C. PETTY, E. J. STRAIT, F. L. WAELBROECK, AND H. R. WILSON.
Propagation of magnetic islands in the E-r=0 frame of co-injected neutral beam driven discharges in the DIII-D tokamak.
Phys. Plasmas 10, 3644-3648 (2003).

D J CAMPBELL, P BARABASCHI, M BECOULET, et al
Report on the 9th European Fusion Physics Workshop
Plasma Phys Contr Fusion 45, 505 (2003)

D A MOSSESSIAN, P B SNYDER, A HUBBARD, et al
High confinement mode edge stability of Alcator C-MOD plasmas
Phys Plasmas 10, 1720 (2003)

V. PARAIL, H. R. WILSON, and others (20).
Integrated predictive modeling of JET H-mode plasma with type-I and type-III ELMs.
Plasma Phys. Reports 29, 539-544 (2003).

A. R. FIELD, H. R. WILSON, and others (23).
H-mode plasmas in the MAST spherical tokamak.
Plasma Phys. Controlled Fusion 44, A113-A121 (2002).

M. GRYAZNEVICH, H. R. WILSON, and others (16).
Next-step-targeted experiments on the Mega-Amp Spherical Tokamak.
Phys. Plasmas 10, 1803-1808 (2003).

G. F. COUNSELL, H. R. WILSON, and others (13).
Confinement and exhaust in the Mega Ampere Spherical Tokamak.
Plasma Phys. Controlled Fusion 44, B23-B37 (2002).

G. M. VOSS, A. BOND, J. B. HICKS, AND H. R. WILSON.
Development of the spherical tokamak power plant.
Fusion Engineering Design 63-4, 65-71 (2002).

A. D. TURNBULL, H. R. WILSON, and others (25).
Predictive capability of MHD stability limits in high performance DIII-D discharges.
Nuclear Fusion 42, 917-932 (2002).

R. J. AKERS, H. R. WILSON, and others (43).
H-mode access and performance in the Mega-Amp Spherical Tokamak.
Phys. Plasmas 9, 3919-3929 (2002).

D. A. MOSSESSIAN, H. R. WILSON, and others (9).
H-mode pedestal characteristics and MHD stability of the edge plasma in Alcator C-Mod.
Plasma Phys. Controlled Fusion 44, 423-437 (2002).

P. B. SNYDER, H. R. WILSON, and others (10).
Edge localized modes and the pedestal, A model based on coupled peeling-ballooning modes.
Phys. Plasmas 9, 2037-2043 (2002).

P. B. SNYDER AND H. R. WILSON.
ELMs and the role of current-driven instabilities in the pedestal.
Contributions Plasma Phys. 42, 258-271 (2002).

Y. IGITKHANOVA, H. R. WILSON, and others (14).
A physics picture of type I ELMs.
Contributions Plasma Phys. 42, 272-276 (2002).

H. R. WILSON.
Neoclassical tearing modes.
Fusion Science Technology 41, 107-115 (2002).

R. J. BUTTERY, H. R. WILSON, and others (7).
Neoclassical tearing physics in the spherical tokamak MAST.
Phys. Rev. Lett. 88, 125005 (2002). [ external link ]

H. R. WILSON, P. B. SNYDER, G. T. A. HUYSMANS, AND R. L. MILLER.
Numerical studies of edge localized instabilities in tokamaks.
Phys. Plasmas 9, 1277-1286 (2002).

F. L. WAELBROECK, J. W. CONNOR, AND H. R. WILSON.
Finite Larmor-radius theory of magnetic island evolution.
Phys. Rev. Lett. 8721, 215003 (2001). [ external link ]

J. M. ADAMS, H. R. WILSON, and others (263).
Overview of JET results in support of the ITER physics basis.
Nuclear Fusion 41, 1327-1340 (2001).

A. SYKES, H. R. WILSON, and others (23).
First results from MAST.
Nuclear Fusion 41, 1423-1433 (2001).

J. B. TAYLOR, J. W. CONNOR, C. G. GIMBLETT, H. R. WILSON, AND R. J. HASTIE.
Resistive wall modes and nonuniform wall rotation.
Phys. Plasmas 8, 4062-4072 (2001).

R. J. BUTTERY, M. VALOVIC, C. D. WARRICK, AND H. R. WILSON.
Controlled seeding of neoclassical tearing modes in COMPASS-D.
Nuclear Fusion 41, 985-994 (2001).

S. J. FIELDING, H. R. WILSON, and others (13).
Transition dynamics and confinement scaling in COMPASS-D H mode plasmas.
Nuclear Fusion 41, 909-917 (2001).

J. W. CONNOR, F. L. WAELBROECK, AND H. R. WILSON.
The role of polarization current in magnetic island evolution.
Phys. Plasmas 8, 2835-2848 (2001).

T. C. HENDER, H. R. WILSON, and others (9).
Spherical tokamak power plant design issues.
Fusion Engineering Design 48, 255-263 (2000).

A. SYKES, H. R. WILSON, and others (16).
First physics results from the MAST Mega-Amp Spherical Tokamak.
Phys. Plasmas 8, 2101-2106 (2001).

T C HENDER, A BOND, J EDWARDS  
S pherical tokamak power plant design issues
Fusion Eng Des 48 255 (2000)

R J BUTTERY, S GUENTER, G GIRUZZI et al
Neoclassical tearing modes
Plasma Phys Contr Fusion 42 B61 (2000)

G M VOSS, S ALLFREY, A BOND et al
A conceptual design of a sphererical tokomak power plant
Fusion Eng Design 51-2 309 (2000)

M VALOVIC, B LLOYD, K G McCLEMENTS et al
Quasi stationary high beta plasmas and fast particle instabilities in the COMPASS-D tokamak with ECRH and LHCD
Nucl Fusion 40 1569 (2000)

R J LA HAYE, R J BUTTERY, S GUENTER et al 
Dimensionless scaling of the critical beta for onset of a neoclassical tearing mode
Phys Plasmas 7 3349 (2000)

C D WARRICK, R J BUTTERY, G CUNNINGHAM et al
Complete stabilisation of neoclassical tearing modes with lower hybrid current drive on COMPASS-D
Phys Rev Lett 85 574 (2000)

R J AKERS, A BOND, R J BUTTERY et al
Steady state operation of spherical tokamaks
Nucl Fusion 40 1223 (2000)

S J FIELDING, A R FIELD, M VALOVIC et al
The influence of MHD instabilities on the COMPASS-D H-mode threshold
Plasma Phys Contr Fusion 42 A191 (2000)

H R WILSON, J W CONNOR, A R FIELD et al
Influence of the plasma edge on tokamak performance
Nucl Fusion 40 713 (2000)

J W CONNOR and H R WILSON
A review of theories of the L-H transition
Plas Phys Contr Fusion 42 R1 (2000)

A SYKES, R J AKERS, L C APPEL et al
H-mode operation in the START spherical tokamak
Phys Rev Lett 84 495 (2000)

A W MORRIS, R J AKERS, J W CONNOR et al
The role of the spherical tokamak in clarifying tokamak physics
Plas Phys Contr Fusion 41 B191 (1999)

F W PERKINS, A BONDESSON, R J BUTTERY et al
Neoclassical islands, beta limits, error fields and ELMs in reactor scale tokamaks
Nucl Fusion 39 2051 (1999)

H R WILSON, J W CONNOR, A R FIELD at al
Ideal MHD stability of the tokamak high confinement mode edge region
Phys Plasmas 6 1925 (1999)

H R WILSON and R L MILLER
Access to second stability region for coupled peeling-ballooning modes in tokamaks
Phys Plasmas 6 873 (1999)

J W CONNOR, R J HASTIE, H R WILSON et al
MHD stability of tokamak edge plasmas
Phys Plasmas 5 2687 (1998)

D A GATES, B LLOYD, A W MORRIS et al
Neoclassical islands on COMPASS-D
Nucl Fusion 37 1593 (1997)

H ZOHN, D GATES, H R WILSON et al
Neoclassical MHD in ASDEX-Upgrade and COMPASS-D
Plas Phys Contr Fusion 39 B237 (1997)

O SAUTER, R J LA HAYE, Z CHANG et al
Beta limits in long-pulse tokamak discharges
Phys Plasmas 4 1654 (1997)

D C ROBINSON, R BUTTERY, I COOK et al
The way forward for the spherical tokamak
Fusion Tech 30 1360 (1996)

H R WILSON, M ALEXANDER, J W CONNOR, et al
The collisionality dependence of the tokamak b -limit
Plasma Phys Contr Fusion 38 A149 (1996)

J B TAYLOR and H R WILSON
Plasma rotation and toroidal drift modes
Plas Phys Contr Fusion 38 1999 (1996)

J B TAYLOR, H R WILSON and J W CONNOR
Structure of short-wavelength drift modes and transport in a toroidal plasma
Plas Phys Contr Fusion 38 243 (1996)

C C HEGNA, J W CONNOR, R J HASTIE et al
Toroidal coupling of ideal MHD instabilities in tokamak plasmas
Phys Plasmas 3 584 (1996)

 HR WILSON, J W CONNOR, R J HASTIE et al
Threshold for neoclassical magnetic islands in a low collision frequency tokamak
Phys Plasmas 3 248 (1996)

J W CONNOR and H R WILSON
Theory of isolated, small scale magnetic islands in a high temperature tokamak plasma
Phys Plasmas 2 4575 (1995)

J W CONNOR, S J FIELDING, A POLEVOI et al
Theoretical models and results from COMPASS-D, START and JET
Phys Scripta 51 605 (1995)

J W CONNOR, R J HASTIE and H R WILSON
Physics considerations on anomalous transport
Fusion Tech 27 45 (1995)

N DELIYANAKIS, D P O'BRIEN, B BALET et al
The VH mode at JET,
Plas Phys Contr Fusion 36 1159 (1994)

J W CONNOR and H R WILSON
Survey of theories of anomalous transport
Plas Phys Contr Fusion 36 719 (1994)

F TIBONE, J W CONNOR, T E STRINGER et al
An assessment of theoretical models based on observations in the JET tokamak II: Heat transport due to electron drift waves, electromagnetic and resistive fluid turbulence, and magnetic islands
Plasma Phys Contr Fusion 36 473 (1994)

A SYKES, J W CONNOR, R DUCK et al
Tight aspect ratio tokamaks: theory and experiment
Plasma Phys Contr Fusion 35 1051 (1993)

J B TAYLOR, J W CONNOR, and H R WILSON
Structure and damping of toroidal drift waves (and their implications for anomalous transport)
Plas Phys Contr Fusion 35 1063 (1993)

H R WILSON
Ideal ballooning stability in tokamak plasmas with rigid-body toroidal rotation
Plas Phys Contr Fusion 35 885 (1993)

R J COLCHIN, P G CAROLAN, R DUCK et al
The small tight aspect ratio tokamak experiment
Phys Fluids B 5 2481 (1993)

J W CONNOR, G P MADDISON, H R WILSON et al
An assessment of theoretical models based on observations in the JET tokamak I: ion heat transport due to Ñ T_i instabilities
Plas Phys Contr Fusion 35 319 (1993)

J W CONNOR, J B TAYLOR and H R WILSON
Shear damping of drift waves in toroidal plasmas
Phys Rev Lett 70 1803 (1993)

H R WILSON
Bootstrap current scaling in tokamaks
Nucl Fusion 32 257 (1992)

J W CONNOR, R J HASTIE and H R WILSON
The mode structure of high-n resistive ballooning modes
Phys Fluids B 4  56 (1992)

H R WILSON
Resistive ballooning modes in a separatrix equilibrium
Plas Phys Contr Fusion 33 221 (1991)

C M BISHOP, R J HASTIE, A SYKES et al
Ballooning D ¢ in the second stable regime
Phys Fluids B 2 3052 (1990)

H R WILSON
Generalisation of the ballooning D ¢ to poloidally asymmetric equilibria
Plas Phys Contr Fusion 32 443 (1990)

H R WILSON
Lepton-proton event simulation using the parton shower formalism with coherence effects in all branchings
Nucl Phys B 310 589 (1988)

H R WILSON
A study of top quark production at HERA using parton shower simulation of DIS events
Z Phys C Part Fields 41 303 (1988)

H R WILSON
A parton shower lepton-proton event generator, including coherence effects in all branching
Phys Lett B 201 361 (1988)

 

Compositions