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This talk by Eve Stenson explores the optimization and engineering challenges for EPOS (Electrons and Positrons in an Optimized Stellarator), part of the APEX (A Positron-Electron eXperiment) Collaboration. Discover how electron-positron plasmas, as quintessential "pair plasmas" with equal-mass charged particles, can be trapped in a moderately high-field, tabletop-sized stellarator. Learn about the design of this compact device with a ~2-ton axis and ~10-liter confinement volume, which aims to facilitate experimental comparisons with theoretical predictions of plasma phenomena in these uniquely symmetric systems. The presentation highlights how the Simons HSFE collaboration and SIMSOPT framework have addressed key optimization challenges, including the successful testing of small non-planar coils made from high-temperature superconducting tape, implementation of stochastic optimization techniques, and integration of device-specific requirements like a "weave lane" for positron injection. Gain insights into the current device design and construction plans scheduled for the coming year.
