C. Wahlberg I. T. Chapman J. P. Graves
Analytical theory and two different magnetohydrodynamical stability codes are used in a study of the effects of toroidal plasma rotation on the stability of the ideal, internal kink mode in tokamaks. The focus of the paper is on the role that the centrifugal effects on the plasma equilibrium play for the stability of this mode, and results from one…
PublishedYueqiang Liu F. Villone
A self-consistent, rigorous approach is proposed to study the synergistic effects of plasma flow, drift kinetic resonances and three-dimensional conducting structures on the resistive wall mode. This approach is based on coupling between the hybrid MHD-kinetic computation and the 3D electromagnetic eddy current computation via a specific boundary c…
PublishedP. Jacquet G. Bergerby V. Bobkov T. Blackman F. Durodié et al.
A Sub-Harmonic Arc Detection (SHAD) system has been installed on the transmission lines feeding the JET ICRF ITER-like-Antenna (ILA). Along with the commissioning of SHAD, extensive measurements of the RF field in the transmission lines were carried-out using fast sampling (125 Mb/s) oscilloscopes. The system is described, and the SHAD ability to d…
PublishedK. G. McClements & R. J. Mckay
Impurity ions with sufficiently high mass in toroidally-rotating tokamak plasmas are deeply trapped by a centrifugal potential well in the outer plasma midplane, with a bounce period that is shorter than both the bounce period of magnetically-trapped ions and the collision time. As a result trace impurity ions can undergo collisional transport at a…
PublishedP. U. Lamalle B. Beaumont T. Gassmann F. Kazarian B. Arambhadiya et al.
The ITER Ion Cyclotron Heating and Current Drive system will deliver 20MW of radio frequency power to the plasma in quasi continuous operation during the different phases of the experimental programme. The system also has to perform conditioning of the tokamak first wall at low power between main plasma discharges. This broad range of reqiurements …
PublishedJ. Garcia J. F. Artaud V. Basiuk M. Brix J. Decker et al.
The impact of the Radio Frequency heating and current drive systems on the ITER advanced scenarios is analyzed by means of the CRONOS suite of codes for integrated tokamak modelling. As a first step, the code is applied to analyze a high power advanced scenario discharge of JET in order to validate both the heating and current drive modules and the…
PublishedM. Bécoulet G. Huysmans X. Garbet E. Nardon D. Howell A.Garofalo M. Schaffer T. Evans K. Shaing A. Cole J.-K. Park P. Cahyna
Non-linear reduced MHD modelling of the response of a toroidally rotating plasma on Resonant Magnetic Perturbations (RMPs) is presented for DIII-D and ITER typical parameter. The non-linear cylindrical reduced MHD (RMHD) code was adapted to take into account toroidal rotation and plasma braking mechanisms such as resonant braking (~jxB) and the Neo…
PublishedAnthony J. Webster
This paper describes physically and mathematically how the plasma-vacuum boundary of a tokamak plasma equilibrium can be perturbed to form a separatrix with an X-point, while having an otherwise negligible affect on the plasma equilibrium. A deliberate consequence of the technique is that the radial and poloidal extent of the perturbed region may b…
Published