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We present a test platform for the Athena X-IFU detection chain, which willserve as the first demonstration of the representative end-to-end detection andreadout chain for the X-IFU, using prototypes of the future flight electronicsand currently available subsystems. This test bench, housed in a commercialtwo-stage ADR cryostat, includes a focal plane array placed at the 50 mK coldstage of the ADR with a kilopixel array of transition-edge sensormicrocalorimeter spectrometers and associated cold readout electronics.Prototype room temperature electronics for the X-IFU provide the readout, andwill evolve over time to become more representative of the X-IFU missionbaseline. The test bench yields critical feedback on subsystem designs andinterfaces, in particular the warm readout electronics, and will provide anin-house detection system for continued testing and development of the warmreadout electronics and for the validation of X-ray calibration sources. Inthis paper, we describe the test bench subsystems and design, characterizationof the cryostat, and current status of the project.

A test platform for the detection and readout chain for the Athena X-IFU