Single-pass absorption simulations in Divertor Tokamak Test scenario

An analysis of the Ion Cyclotron Resonance Heating (ICRH) propagation and single-pass absorption in DTT (Divertor Tokamak Test facility) heating scenarios has been performed by means of the numerical tool TOMCAT. It allows to study wave propagation and damping as well as mode conversion for a 1D plasma of Maxwellian species and it is based on solving a twelfth-order differential system using the finite-element formalism. This analysis aimed to explore a wider parameter space compared to previous results obtained using TORIC, with the goal of enhancing the understanding of DTT scenarios and confirming the physics inputs to system design. Scenarios of minority heating at 3T and 6T were analyzed, simulating with different plasma species, including varying concentrations of D, 3He, and H, across the frequency range from 45 MHz to 90MHz. Three-ion scenarios for full-field scenarios have been analyzed too, indicating the need for further exploration to determine the plasma and radio frequency (RF) parameters required to achieve significant power absorption by the third ion species. Finally, an approximate evaluation of the ICRH contribution to heat load has been also performed.