UKAEA Papers

"DEVELOPMENT OF ELECTRON BERNSTEIN WAVE RESEARCH IN MAST"

• V. Shevchenko
• G. Cunningham
• A. Gurchenko
• E. Gusakov
• B. Lloyd
• M. O’Brien
• A. Saveliev
• A. Surkov
• F. Volpe
• M. Walsh

Burning plasma spherical tokamaks (STs) rely on off-axis current drive (CD) and nonsolenoid start-up techniques. Electron Bernstein waves (EBWs) may provide efficient off-axis heating and CD in high-density ST plasmas. EBWs may also be used in the plasma start-up phase because EBW absorption and CD efficiency remain high even in relatively cold pla…

"Full orbit computations of ripple-induced fusion"

• K. G. McClements

A full orbit code is used to compute collisionless losses of fusion particles from three proposed burning plasma tokamaks: the International Tokamak Experimental Reactor ITER; a spherical tokamak power plant (STPP) [T. C. Hender, A. Bond, J. Edwards, P. J. Karditsas, K. G. McClements, J. Mustoe, D. V. Sherwood, G. M. Voss, and H. R. Wilson, Fusion …

"NEUTRAL BEAM INJECTION IN THE JET TRACE TRITIUM EXPERIMENT"

• E. Surrey
• D. Ciric
• S. J. Cox
• L. Hackett
• D. Homfray
• I. Jenkins
• T. T. C. Jones
• D. Keeling
• R. King
• A. Whitehead
• D. Young

Operation of the JET Neutral Beam Injectors with tritium is described. Supplying the tritium feed via the special electrically grounded gas feed compromised the performance of the up-graded high current triode Positive Ion Neutral Injectors (PINI) due to gas starvation of the source and the methods adopted to ameliorate this effect are described. A…

"Generation of Noninductive Current by Electron-BernsteinWaves on the COMPASS-D Tokamak"

• V. Shevchenko
• Y. Baranov
• M. O’Brien
• A. Saveliev

Electron-Bernstein waves (EBW) were excited in the plasma by mode converted extraordinary ( X ) waves launched from the high field side of the COMPASS-D tokamak at different toroidal angles. It has been found experimentally that X -mode injection perpendicular to the magnetic field provides maximum heating efficiency. Noninductive currents of up to…

"Possible electron Bernstein wave heating scenarios for MAST"

• R. A. Cairns
• C. N. Lashmore-Davies
• M. O’Brien

"ECRH/ECCD in advanced ITER scenarios"

• C D Warrick
• B Lloyd
• M R O’Brien

Electron cyclotron (EC) waves can perform a variety of roles in ITER including start-up assist, heating to ignition, on and off-axis current drive and instability control. EC wave absorption is robust and well understood producing highly localised heating with total absorption anticipated for almost all parameters foreseen in ITER. Other advantages…

"Three dimensional neoclassical nonlinear kinetic equation for low collisionality axisymmetric tokamak plasmas"

• F. S. Zaitsev
• M. R. O’Brien
• M. Cox

The three-dimensional nonlinear kinetic equation for low collisionality tokamak plasmas with consistent consideration of neoclassical effects is obtained using an approach differing from the standard neoclassical theory technique. This allows treatment of large-banana widths and large inverse aspect ratios. The equation is suitable for computer mod…