Implementation of Radiation in the Systems Code FAROES

Radiation is important for power balance in tokamaks and for fusion devices in general. In the case of tokamaks, the main modalities are Bremsstrahlung, synchrotron, and impurity radiation. Bremsstrahlung is caused by electron-ion collisions, synchrotron radiation is due to emissions from electrons in the strong magnetic field, and impurity radiation is composed of line radiation and recombination emissions from impurities in the plasma. FAROES is a fusion systems code designed to perform optimization studies. Models for Bremsstrahlung, synchrotron, and impurity radiation in simple plasma geometries with triangularity are being incorporated into FAROES. Radiation models for flat, 'parabolic', and pedestal-type density and temperature profiles are being implemented. With these models, we study how radiation relates to overall systems cost, through the relationship between wall reflectivity and synchrotron losses, and through radiation due to impurities in the core. Constructing a radiation model in FAROES will allow for a more thorough account of the costs of fusion devices.