Physics design of the Eos neutron source stellarator

Thea Energy will build a mid-scale planar coil stellarator, called Eos, which will be used as a neutron source for tritium and medical isotope production. Thea Energy's novel design concept will generate optimized stellarator magnetic fields without complex, expensive, 3D modular coils, while retaining all the advantages of the inherently steady-state stellarator approach. The DESC code is used in a single stage to optimize a quasi-axisymmetric stellarator magnetic field geometry. A set of encircling planar coils and another set of small planar shaping coils provide an on-axis field of 5 Tesla. Electron cyclotron heating will generate deuterium plasma with a central electron temperature of ~ 13 keV. A pebble-based renewable wall will aid in removing particles and heat from the non-resonant divertors. Two negative ion deuterium neutral beams of energy with energy of ~ 1 MeV will be injected into the deuterium plasma to generate D-D neutrons with energy ranging from 2 to 4 MeV, resulting a steady state neutron flux of ~ 3×10¹⁷ neutrons/sec. It is estimated that ~0.2 grams/day of tritium will be generated.