2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/102381High quality low leakage SINIS devices made of Al-AlMn-Al layers were fabricated for energy dispersive single photon detection. Information on different heat flow channels was extracted from the measured dynamics of detector signals due to X-ray events. At the optimum operation point, the extracted effective electron temperature decreased from 88 mK down to 43 mK due to self-cooling, roughly doubling the detector sensitivity.3 pages, 3 figuresInstrumentation and Detectorstext