Optimized foil placement in a direct-laser-acceleration gas jet increases retained Bethe-Heitler positrons roughly eightfold over an earlier single-stage design.
Alternatively, quasi-3D simulations can be used by exploiting the cylindrical symmetry of the system, greatly reducing the computational resources required
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Improved Bethe-Heitler positron creation and retention by combining direct laser acceleration and solid target interaction within a gas jet
Optimized foil placement in a direct-laser-acceleration gas jet increases retained Bethe-Heitler positrons roughly eightfold over an earlier single-stage design.