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The rate of reconnection characterizes how quickly flux and mass can moveinto and out of the reconnection region. In the Terrestrial ReconnectionEXperiment (TREX), the rate at which antiparallel asymmetric reconnectionoccurs is modulated by the presence of a shock and a region of flux pileup inthe high-density inflow. Simulations utilizing a generalized Harris-sheetgeometry have tentatively shown agreement with TREX's measured reconnectionrate scaling relative to system size, which is indicative of the transitionfrom ion-coupled toward electron-only reconnection. Here we present simulationstailored to reproduce the specific TREX geometry, which confirm both thereconnection rate scale as well as the shock jump conditions previouslycharacterized experimentally in TREX. The simulations also establish aninterplay between the reconnection layer and the Alfv\'enic expansions of thebackground plasma associated with the energization of the TREX drive coils;this interplay has not yet been experimentally observed.

Kinetic Simulations Verifying Reconnection Rates Measured in the Laboratory, Spanning the Ion-Coupled to Near Electron-Only Regimes