Speaker
Description
Arrays with tens to hundreds of Metallic Magnetic Calorimeters (MMCs), each implanted with $^{163}$Ho, were selected for the ECHo experiment, because of the excellent energy resolution of up to 2-3 eV, a fast response time below 1 µs, and a near-linear detector response that allows for a reliable energy calibration. Based on the performance achieved with the detectors developed for the first phase of the ECHo experiment, the ECHo-1k phase, a new design of 64-pixel ECHo-100k arrays has been conceived. This new design features an optimised single pixel geometry, allowing for a larger $^{163}$Ho activity of 10 Bq per pixel. First wafers, each with 40 ECHo-100k detector chips, have been fabricated, and the characterisation of the newly developed detector arrays at different temperatures has been performed. We present the measured performance of both the implanted and non-implanted ECHo-100k detector pixels. In conclusion, we discuss the on-going R&D to demonstrate the scalability of detector fabrication, including the ion-implantation of $^{163}$Ho, as a preparation for the large-scale production of the 12000 MMC pixels, foreseen for the ECHo-100k phase of the experiment.
| Collaboration | The ECHo Collaboration |
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