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Segmented telescopes are a possibility to enable large-aperture spacetelescopes for the direct imaging and spectroscopy of habitable worlds.However, the complexity of their aperture geometry, due to the centralobstruction, support structures and segment gaps, makes high-contrast imagingchallenging. The High-contrast Imager for Complex Aperture Telescopes (HiCAT)testbed was designed to study and develop solutions for such telescope pupilsusing wavefront control and coronagraphic starlight suppression. The testbeddesign has the flexibility to enable studies with increasing complexity fortelescope aperture geometries: off-axis telescopes, on-axis telescopes withcentral obstruction and support structures - e.g. the Wide Field InfraredSurvey Telescope (WFIRST) - to on-axis segmented telescopes, including variousconcepts for a Large UV, Optical, IR telescope (LUVOIR). In the past year,HiCAT has made significant hardware and software updates to accelerate thedevelopment of the project. In addition to completely overhauling the softwarethat runs the testbed, we have completed several hardware upgrades, includingthe second and third deformable mirror, and the first custom Apodized PupilLyot Coronagraph (APLC) optimized for the HiCAT aperture, which is similar toone of the possible geometries considered for LUVOIR. The testbed also includesseveral external metrology features for rapid replacement of parts, and inparticular the ability to test multiple apodizers readily, an active tip-tiltcontrol system to compensate for local vibration and air turbulence in theenclosure. On the software and operations side, the software infrastructureenables 24/7 automated experiments that include routine calibration tasks andhigh-contrast experiments. We present an overview and status update of theproject, on the hardware and software side, and describe results obtained withAPLC WFC.

High-contrast imager for complex aperture telescopes (HiCAT): 5. first results with segmented-aperture coronagraph and wavefront control