Abstract
The RAYTEC code for electron cyclotron (EC) wave radiative transport modelling of fusion plasmas which earlier had been generalised to include a population of suprathermal electrons to cover EC radiative transport in the presence of an anisotropic distribution of suprathermal electrons in the form of a one-sided loss- or anti-loss-cone in pitch angle, has been modified and, furthermore, now also covers inverted loss-cone and anti-loss-cone distributions. This offers the possibility of dealing with anisotropic distributions symmetric in the electron velocity parallel to the magnetic field, as typical for the case of EC wave heating. Practical issues related to this approach are displayed and the impact of various choices of suprathermal populations on net EC wave power emission from a fusion plasma is evaluated and discussed.
Highlights
The local electron cyclotron (EC) wave power losses can be a competitive contribution to the 1D electron local power balance for reactor-grade tokamak plasmas with core temperatures of 35 keV or higher as anticipated for steady-state operation in ITER and DEMO [1]
The RAYTEC code for electron cyclotron (EC) wave radiative transport modelling of fusion plasmas which earlier had been generalised to include a population of suprathermal electrons to cover EC radiative transport in the presence of an anisotropic distribution of suprathermal electrons in the form of a one-sided loss- or anti-loss-cone in pitch angle, has been modified and, covers inverted loss-cone and anti-loss-cone distributions
This offers the possibility of dealing with anisotropic distributions symmetric in the electron velocity parallel to the magnetic field, as typical for the case of EC wave heating
Summary
The local EC wave power losses can be a competitive contribution to the 1D electron local power balance for reactor-grade tokamak plasmas with core temperatures of 35 keV or higher as anticipated for steady-state operation in ITER and DEMO [1] This has motivated work to improve the modelling capabilities for the radial profile of the net EC wave emission in fusion plasmas in view of the calculation of the absorption coefficient [2], the wall reflection properties [3] and polarization scrambling effects [4], the computation efficiency, toroidal plasma geometry with arbitrary crosssection [5], and the presence of a population of suprathermal electrons [6]. Both forward and backward (with respect to the magnetic field) loss-cone (and anti-loss-cone) distributions have been implemented in RAYTEC which offers the possibility of dealing with anisotropic distributions symmetric in the electron velocity parallel to the magnetic field, as typical for the case of EC wave heating
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