Speaker
Description
In tokamaks, when plasma instabilities known as Edge Localized Modes (ELM) occur, large amounts of energy can be released towards the wall and therefore methods are required for their suppression or mitigation. A good candidate are Resonant Magnetic Perturbations (RMPs) which can trigger magnetic stochasticity causing the decrease of the pressure gradients at the pedestal [1]. In the present work, this method is being applied to H-mode scenarios of the Divertor Tokamak Test facility (DTT), under construction in Italy with the involvement of the EUROfusion laboratories.
Advanced modeling tools are required to understand the underlying physics and optimization of RMPs. On the one hand, the linear-resistive MHD code MARS-F offers the possibility to study stability and plasma response in the linear limit, thus allowing fast spectrum optimization [2]. On the other hand, RMPs and their interaction with the plasma are being investigated with the nonlinear code JOREK [3], keeping as a reference validated modeling and application from prior studies in ASDEX Upgrade [4] [5]. The primary effort is being dedicated to develop DTT full power and reduced power (Day 0) scenarios in JOREK with the aim of studying external non axisymmetric RMPs and their 3D effects on physical profiles and pedestal instabilities. The spatial geometry of the RMP coils (NAS coils) was implemented, and scans in toroidal phasing of the coils have been modeled. Furthermore, MARS-F simulations will be employed to compare the plasma response with the vacuum field. The same modeling workflow is also applied, for linear verification and training purposes, to RFX-mod2: a device operated both in reversed field pinch and tokamak configurations [6][7], featuring a large number of RMP coils. The MARS-F, JOREK and CASTOR3D [8] results are compared for a circular tokamak scenario.