Development of an End-to-End Demonstration Readout Chain for Athena/X-IFU

The X-ray Integral Field Unit (X-IFU) of the Athena observatory, scheduled for launch in mid 2030's, will provide spectroscopy data with unprecedented spectral and spatial resolution. This be achieved a 2 kilo-pixel array transition-edge sensor (TES) microcalorimeters. complete detection chain is under development by large international collaboration. In order to perform an end-to-end demonstration X-IFU readout chain, 50 mK test bench being developed at IRAP collaboration CNES. uses two-stage ADR cryostat from Entropy GmbH, 1024-pixel array, initially operated using warm electronics NIST NASA Goddard Space Flight Center. We describe system installed current results obtained these electronics. also review status integration digital (DRE) prototype into plan integrating testing chain.