D. Kennedy M. Giacomin B. S. Patel W. A. Hornsby D. Dickinson C. M. Roach
We present herein the results of a linear gyrokinetic analysis of electromagnetic microinstabilites in the conceptual high−β, reactor-scale, tight-aspect-ratio tokamak STEP (Spherical Tokamak for Energy Production, https://step.ukaea.uk). We examine a range of flux surfaces between the deep core and the pedestal top for the two candidate flat…
Preprint PublishedM. Giacomin D. Kennedy C. J. Ajay D. Dickinson B. S. Patel C. M. Roach
In this work, we present the results of first-of-their-kind nonlinear local gyrokinetic simulations of electromagnetic turbulence at mid-radius in the burning plasma phase of the conceptual high-β, reactor-scale, tight-aspect-ratio tokamak STEP (Spherical Tokamak for Energy Production). A prior linear analysis in D.Kennedy et al. submitted to Nucl…
PreprintM. Giacomin D. Dickinson D. Kennedy B. Patel C. M. Roach
Linear and nonlinear gyrokinetic simulations are performed in experimentally relevant scenarios built from a MAST case where a microtearing mode instability dominates at ion Larmor radius scale. This collisional microtearing mode instability appears only when a vel…
Preprint PublishedD. Galassi C. Theiler T. Body F. Manke P. Micheletti J. Omotani M. Wiesenberger M. Baquero-Ruiz I. Furno M. Giacomin E. Laribi F. Militello P. Ricci A. Stegmeir P. Tamain H. Bufferand G. Ciraolo H. De Oliveira A. F. Fasoli V. Naulin S. L. Newton N. Offeddu D. Sales Oliveira E. Serre N. Vianello
Transport processes around the magnetic X-point of tokamaks, such as turbulence and mean-field drifts, are scarcely understood and difficult to investigate in experiments. In this paper, we explore the dynamics in a newly developed X-point scenario on the basic toroidal plasma device TORPEX and use it to validate plasma edge turbulence codes. In-si…
Preprint Published