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With its first flight in 2018, Micro-X became the first program to flyTransition-Edge Sensors and their SQUID readouts in space. The science goal wasa high-resolution, spatially resolved X-ray spectrum of the Cassiopeia ASupernova Remnant. While a rocket pointing error led to no time on target, thedata was used to demonstrate the flight performance of the instrument. Thedetectors observed X-rays from the on-board calibration source, but asusceptibility to external magnetic fields limited their livetime. Accountingfor this, no change was observed in detector response between ground operationand flight operation. This paper provides an overview of the first flightperformance and focuses on the upgrades made in preparation for reflight. Thelargest changes have been upgrading the SQUIDs to mitigate magneticsusceptibility, synchronizing the clocks on the digital electronics to minimizebeat frequencies, and replacing the mounts between the cryostat and the rocketskin to improve mechanical integrity. As the first flight performance wasconsistent with performance on the ground, reaching the instrument goals in thelaboratory is considered a strong predictor of future flight performance.

First operation of Transition-Edge Sensors in space with the Micro-X sounding rocket