R. G. L. Vann R. O. Dendy M. P. Gryaznevich
Frequency sweeping (chirping) of high frequency magnetohydrodynamic modes is widely observed in tokamak plasmas. In this paper observations of chirping in neutral-beam-heated plasmas in the Mega-Amp Spherical Tokamak (MAST) [A. Sykes, R. J. Akers, L. C. Appel and et al. , Nucl. Fusion 41 , 1423 (2001)] are considered, and it is shown that these may…
PublishedA. Perevezentsev A. Bell D. Brennan A. Miller A. Healer C. Gentile L. Ciebiera S. Langish
Operation with tritium plasma led to contamination of the JET in-vessel components with tritium at a level exceeding 12kBq/g, which is the Low Level Waste (LLW) threshold in the UK. Carbon tiles used at JET for protecting the pumped divertor and inner wall against heat and neutron flux create one of the Intermediate Level Waste (ILW) streams to dea…
PublishedG. Y. Antar G. Counsell J.-W. Ahn Y. Yang M. Price A. Tabasso A. Kirk
Recently, it was shown that intermittency observed in magnetic fusion devices is caused by large-scales events with high radial velocity reaching about 1/10th of the sound speed s called avaloids or blobs [G. Antar and et al. , Phys. Rev. Lett. 87 065001 (2001)]. In the present paper, the poloidal distribution of turbulence is investigated on the M…
PublishedRJH Pearce AC Bell D Brennan H Boyer J Bruce T Budd PR Butcher N Davies T Edlington R Felton J Harling T Hartrampf M Hitchin S Hotchin TTC Jones R King G Lawrence R Lobel P Morgan SR Shaw M Stamp E Surrey D Wilson L Worth K Zastrow
‘Trace Tritium Experiments’ (TTE) were successfully performed on JET in 2003. The Campaign marked the first use of tritium in JET plasmas since the Deuterium- Tritium Experiment (DTE1) Campaign in 1997, and was the first use of tritium in experiments under the EFDA organisation with the UKAEA as JET Operator. The safety and regulatory preparati…
PublishedP. Helander R. J. Akers
The collisional interaction between neutral-beam ions and bulk plasma electrons leads to convective transport of particles and energy similar to the well-known Ware pinch. These transport fluxes are calculated, and it is found that the particle flux is outward when the neutral beams are in the same direction as the plasma current and inward otherwi…
PublishedM. R. De Baar A. Thyagaraja G. M. D. Hogeweij P. J. Knight E. Min
A two-fluid computer model of electromagnetic tokamak turbulence, CUTIE , is used to study the dynamic structure and turbulent transport in the Rijnhuizen Tokamak Project tokamak. A discharge with dominant, off-axis electron cyclotron heating is the main focus of the simulations which were extended over several resistive diffusion times. CUTIE repr…
PublishedI Cook D Maisonnier N P Taylor D J Ward P Sardain L Di Pace L Giancarli S Hermsmeyer P Norajitra R Forrest For The Ppcs Team
ABSTRACT. The European Power Plant Conceptual Study (PPCS) reported in the summer of 2004. Several conceptual designs (“Models”) for commercial fusion power plants were developed, spanning a range from relatively near term to more substantial extrapolations. The parameters of the Models were chosen by systems analysis to be economically optimal…
PublishedE. 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…
PublishedJ. A. Snipes N. Basse C. Boswell E. Edlund A. Fasoli N. N. Gorelenkov R. S. Granetz L. Lin Y. Lin R. Parker M. Porkolab J. Sears S. Sharapov V. Tang S. Wukitch
Alfven eigenmodes (AEs) are studied to assess their stability in high density reactor relevant regimes. Stable AEs are excited with active magnetohydrodynamics antennas in the range of the expected AE frequency. Toroidal Alfven eigenmode (TAE) damping rates have been observed in diverted and limited Ohmic plasmas. Energetic particle modes or TAEs h…
PublishedP. Mantica A. Thyagaraja J. Weiland G. M. D. Hogeweij P. J. Knight
Two fluid turbulence models, the drift wave based quasilinear 1.5D Weiland model and the electromagnetic global 3D nonlinear model CUTIE , have been used to account for heat pinch evidence in off-axis modulated electron cyclotron heating experiments in the Rijnhuizen Tokamak Project. Both models reproduce the main features indicating inward heat co…
Published