M.G. Von Hellermann E.Delabie R.J.E. Jaspers W.Biel O.Marchuk H.P.Summers A.Whlteford C.Giroud N.C.Hawkes K.D.Zastrow
Charge exchange Recombination Spectroscopy (CXRS) plays a pivotal role in the diagnostics of hot fusion plasmas and is implemented currently in most of the operating devices. In the present report the main features of CXRS are summarized and supporting software packages encompassing "Spectral Analysis Code CXSFIT", "Charge Exchange Analysis Package…
PublishedJ.-M. Noterdaeme L.-G. Eriksson M. Mantsinen M.-L. Mayoral D. Van Eester J. Mailloux C. Gormezano T. T. C. Jones
The physics studies of the three “heating” systems that are installed on JET are reviewed. Results from the beginning of JET up to now are presented with some emphasis on the more recent ones. The systems were used not only for heating, where JET has laid the groundwork to qualify them for heating the next generation of machines to ignition, bu…
PublishedYueqiang Liu M. S. Chu C. G. Gimblett R. J. Hastie
An analytical, large aspect ratio, calculation of the drift-kinetic energy perturbation is carried out for the resistive wall mode, due to the mode resonance with the magnetic precession drifts of trapped thermal ions and electrons. Four asymptotic cases are identified and analyzed in detail. Generally, a partial stabilization of the mode is possib…
PublishedL. Meneses L. Cupido A. Sirinelli M. E. Manso JET-EFDA Contributors
We present the main design options and implementation of an X -mode reflectometer developed and successfully installed at JET using an innovative approach. It aims to prove the viability of measuring density profiles with high spatial and temporal resolution using broadband reflectometry operating in long and complex transmission lines. It probes t…
PublishedI. G. Abel M. Barnes S. C. Cowley W. Dorland G. W. Hammett A. A. Schekochihin T. Tatsuno
We motivate the need to include collisional dissipation in gyrokinetic turbulence simulations, and constract criteria for a physically vaUd model of such dissipation. A new analytically manageable operator satisfying those criteria is presented and transformed into gyrokinetic variables. The form of conservation laws for collision operators in gyro…
PublishedRJ.E. Jaspers M.G. Von Hellermann E. Delabie J.E. Boom Aj.H. Donne W. Biel N.C. Hawkes O. Neubauer M. Di Maio S. Sadakov F. Klinkhamer B. Snijders A. Hogenbirk
Charge eXchange Recombination Spectroscopy (CXRS) will play a crucial role in the diagnosing of burning plasmas: items like helium ash, transport barriers, impurity content or fuel ratio can all be assessed with CXRS. In fact this is the only direct method to obtain information about the light impurity ions, such as temperature, concentrations and …
PublishedJ.W. Connor A. Kirk H.R. Wilson
Edge Localised Modes (ELMs) are periodic disturbances of the plasma periphery occurring in tokamaks with an H-mode edge transport barrier. As a result, a fraction of the plasma energy present in the confined hot edge plasma is transferred to the open field lines in the divertor region, ultimately appearing at the divertor target plates. These event…
PublishedMarco Ariola Gianmaria De Tommasi Didier Mazon Didier Moreau Fabio Piccolo Alfredo Pironti Filippo Sartori Luca Zabeo JET-EFDA Contributors
Advance tokamak scenarios are gaining more and more importance in operating tokamaks. These scenarios pose challenging control problems, since they require the simultaneous achievement of ambitious plasma parameters. The inherent coupling among the various variables calls for an integrated approach for the design of the controllers. This paper desc…
PublishedYueqiang Liu M. S. Chu I. T. Chapman T. C. Hender
A self-consistent kinetic model is developed to study the stability of the resistive wall mode in toroidal plasmas. This model is compared with other models based on perturbative approaches. The degree of the kinetic modification to the stability of the mode depends on the plasma configurations. Both stabilizing and destabilizing kinetic effects ar…
PublishedH. Tojo A. Ejiri M. P. Gryaznevich Y. Takase Y. Adachi
A method to determine the poloidal mode number m in a spherical tokamak based on magnetic probe data was developed. Perturbed magnetic fields at Mirnov coils are calculated for distributed helical filamentary currents on rational surfaces assuming the maximum current amplitude, m and n toroidal mode number, and the toroidal location of the filament…
Published