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A proof-of-principle measurement with lithium, beryllium and boron is planned for fall 2023 at the Paul Scherrer Institute. We discuss the performance achieved with the maXs-30 detector module to be used. To place the detector close to the target chamber where the muon beam will impact the material under study, we have developed a new dilution refrigerator sidearm. We further discuss the expected efficiency given the transparency of the X-ray windows and the quantum efficiency of the detector. The expected muonic X-ray rate combined with the high resolving power and detection efficiency of the detector suggest that QUARTET will be able to study the de-excitation of light muonic atoms at an unprecedented level, increasing the relative energy resolution by up to a factor of 20 compared to conventional detector techniques.<\/jats:p>","DOI":"10.1007\/s10909-024-03141-x","type":"journal-article","created":{"date-parts":[[2024,5,9]],"date-time":"2024-05-09T19:02:01Z","timestamp":1715281321000},"page":"344-351","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["MMC Array to Study X-Ray Transitions in Muonic Atoms"],"prefix":"10.1007","volume":"216","author":[{"given":"Daniel","family":"Unger","sequence":"first","affiliation":[]},{"given":"Andreas","family":"Abeln","sequence":"additional","affiliation":[]},{"given":"Thomas Elias","family":"Cocolios","sequence":"additional","affiliation":[]},{"given":"Ofir","family":"Eizenberg","sequence":"additional","affiliation":[]},{"given":"Christian","family":"Enss","sequence":"additional","affiliation":[]},{"given":"Andreas","family":"Fleischmann","sequence":"additional","affiliation":[]},{"given":"Loredana","family":"Gastaldo","sequence":"additional","affiliation":[]},{"given":"C\u00e9sar","family":"Godinho","sequence":"additional","affiliation":[]},{"given":"Michael","family":"Heines","sequence":"additional","affiliation":[]},{"given":"Daniel","family":"Hengstler","sequence":"additional","affiliation":[]},{"given":"Paul","family":"Indelicato","sequence":"additional","affiliation":[]},{"given":"Ashish","family":"Jadhav","sequence":"additional","affiliation":[]},{"given":"Daniel","family":"Kreuzberger","sequence":"additional","affiliation":[]},{"given":"Klaus","family":"Kirch","sequence":"additional","affiliation":[]},{"given":"Andreas","family":"Knecht","sequence":"additional","affiliation":[]},{"given":"Jorge","family":"Machado","sequence":"additional","affiliation":[]},{"given":"Ben","family":"Ohayon","sequence":"additional","affiliation":[]},{"given":"Nancy","family":"Paul","sequence":"additional","affiliation":[]},{"given":"Randolf","family":"Pohl","sequence":"additional","affiliation":[]},{"given":"Katharina","family":"von Schoeler","sequence":"additional","affiliation":[]},{"given":"Stergiani Marina","family":"Vogiatzi","sequence":"additional","affiliation":[]},{"given":"Frederik","family":"Wauters","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2024,5,9]]},"reference":[{"key":"3141_CR1","unstructured":"B. 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