Development of TES-based detectors array for the X-ray Integral Field Unit (X-IFU) on the future x-ray observatory ATHENA

Understand

We are developing transition-edge sensor (TES)-based microcalorimeters for the X-ray Integral Field Unit (XIFU) of the future European X-Ray Observatory Athena.

• The microcalorimeters are based on TiAu TESs coupled to 250{\mu}m squared, AuBi absorbers.
• We designed and fabricated devices with different contact geometries between the absorber and the TES to optimise the detector performance and with different wiring topology to mitigate the self-magnetic field.
• The design is tailored to optimise the performance under Frequency Domain Multiplexing.