D. Hancock T. Barrett J. Foster M. Fursdon G. Keech S. McIntosh W. Timmis M. Rieth J. Reiser
The design of a divertor target for DEMO remains one of the most challenging engineering tasks to be overcome on the path to fusion power. Under the European DEMO programme, a promising concept known as Thermal Break has been developed at CCFE. This concept is a variation of the ITER tungsten divertor in which the pure Copper interlayer between Cop…
Preprint PublishedT. Eade S. Lilley Z. Ghani E. Delmas
The requirement for maintenance in areas with relatively high shutdown dose rate fields is a key issue to address in the design and engineering of ITER, next generation devices and future commercial fusion reactors. In order to estimate the shutdown dose rate during maintenance and intervention scenarios CCFEs Mesh Coupled implementation of the R…
Preprint PublishedW. N. Lai S. C. Chapman R. O. Dendy
The kinetic evolution in velocity space of a minority suprathermal electron population that is undergoing the anomalous Doppler instability (ADI) is investigated using the results from fully nonlinear numerical simulations that self-consistently evolve particles and fields in a plasma. Electron trajectories in phase space during different stages of…
Preprint PublishedL. Li Y. Q. Liu Y. Liang N. Wang F. C. Zhong Y. Liu
Within the single fluid resistive magnetohydrodynamic model, systematic toroidal modelling efforts are devoted to investigate the plasma response induced screening of the applied external 3D magnetic field perturbations in the presence of sheared toroidal flow. One particular issue of interest is addressed, when the local flow speed approaches zero…
Preprint PublishedS. X. Yang S. Wang Y. Q. Liu G. Z. Hao Z. X. Wang X. M. Song A. K. Wang
The magnetohydrodynamic-kinetic hybrid theory has been extensively and successfully applied for interpreting experimental observations of macroscopic, low frequency instabilities, such as the resistive wall mode, in fusion plasmas. In this work, it is discovered that an analytic version of the hybrid formulation predicts a bifurcation of the mode d…
Preprint PublishedT. Markovic Y. Q. Liu P. Cahyna R. Pánek M. Peterka M. Aftanas P. Bílková P. Bohm M. Imríek P. Há?ek J. Havlicek A. Havránek M. Komm J. Urban The COMPASS Team
It has been shown on several tokamaks that application of a Resonant Magnetic Perturbation (RMP) eld on plasma can under certain conditions lead to suppression or mitigation of Edge-Localized Mode (ELM) instabilities. Due to the rotation of the plasma in the RMP eld reference system, currents are induced on resonant surfaces within the plasma, co…
Preprint PublishedG. Merlo O. Sauter S. Brunner A. Burckel Y. Camenen F. Casson W.Dorland E. Fable T. Görler F. Jenko D. Told A. Peeters L. Villard
Verification is the fundamental step that any turbulence simulation code has to be submitted in order to assess the proper implementation of the underlying equations. We have carried out a cross comparison of three flux tube gyrokinetic codes, GENE [F. Jenko et al., Phys. Plasmas 7, 1904 (2000)], GKW [A. G. Peeters et al., Comput. Phys. Commun. 180…
Preprint PublishedS. C. Guo Y. Q. Liu X. Y. Xu Z. R. Wang
Drift kinetic stabilization of the resistive wall mode (RWM) is computationally investigated using the MHD-kinetic hybrid code MARS-K, following the non-perturbative approach [Liu et al., Phys. Plasmas 15, 112503 (2008)], for both reversed field pinch (RFP) and tokamak plasmas. Various kinetic resonances between the mode and the guiding center drif…
Preprint PublishedY. Camenen F.J. Casson P. Manas A.G. Peeters
The interplay between toroidal rotation u, parallel flow shear u? and perpendicular flow shear ?E in the stabilisation of tokamak turbulence is investigated in non-linear flux-tube gyrokinetic simulations with the GKW code. The non-linear simulations are performed for a reference L-mode DIII-D plasma (the so-called shortfall case) at r/a = 0.8, var…
Preprint PublishedC. Tealdi M.Y. Lavrentiev C.E. Mohn N.L. Allan
Understanding the behaviour of solid solutions over wide ranges of temperature and pressure remains a major challenge to both theory and experiment. Here we report a detailed exchange Monte Carlo study using a classical ionic model of the model perovskite parascandolaite-neighborite (K,Na)MgF3 solid solution and its end-members for temperatures in …
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