LMSAL and NIST are developing position-sensitive x-ray strip detectors based on Transition Edge Sensor (TES)
microcalorimeters optimized for solar physics. By combining high spectral (<i>E/ΔE</i> ~1600) and temporal (single photon
Δt ~10μs) resolutions with imaging capabilities, these devices will be able to study high-temperature (>10 MK) x-ray
lines as never before. Diagnostics from these lines should provide significant new insight into the physics of both
microflares and the early stages of flares. Previously, the large size of traditional TESs, along with the heat loads
associated with wiring large arrays, presented obstacles to using these cryogenic detectors for solar missions.
Implementing strip detector technology at small scales, however, addresses both issues: here, a line of substantially
smaller effective pixels requires only two TESs, decreasing both the total array size and the wiring requirements for the
same spatial resolution. Early results show energy resolutions of Δ Ε<sub><i>FWHM</i></sub> ~30eV and spatial resolutions of ~10-15 μm,
suggesting the strip-detector concept is viable.