Development of the XRISM X-ray Mirror Assembly

X-ray Imaging Spectroscopy Mission (XRISM) is a Hitomi (ASTOR-H) recovery mission being developed under the collaboration between NASA and JAXA.The XRISM will carry an X-ray micro-calorimeter instrument (Resolve) and an X-ray CCD instrument (Xtend), and will be launched in early 2022. NASA's Goddard Space Flight Center is responsible to develop the Resolve instrument including X-ray Mirror Assembly (XMA) for both Resolve and Xtend. As a quick turn around mission to be launched in five years, the design of the instrument had to be the same as Hitomi, i.e. build to print. However, the team made a couple of minor changes to the XMA design and its fabrication process in order to lower any risks and with hope to get better imaging performance.In this paper, we present status of the XMA development and first test resutls of the flight XMAs. The XMA is an aluminum foil X-ray mirror utilizingthe epoxy replication method. One change made to the fabrication process is to use a glass sheet wrapped around a aluminum mandrel as a replication mandrel instead of a Pyrex glass tube for large size reflectors. By this change the large reflectors for the XRISM have better angular resolution than the Hitomi ones (about 1 vs 2 arcmin). The other change is to reduce possibility of focusing MMOD (Micro Meteorid and Orbital Debris) from on- and off-axis angles. We will report basic performance (angular resolution and effective area) from the first X-ray test results to be performed at the upgraded Goddard 100-m X-ray beamline.