Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 64: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)
Q 64.16: Poster
Thursday, March 13, 2025, 17:00–19:00, Tent
Digital Pulse Shape Analysis for Metallic-Magnetic Calorimeters (MMC) — •Johanna H. Walch1,2, Marc O. Herdrich1,2,3, Philip Pfäfflein1,3, Günter Weber1,3, Daniel A. Müller1,2, Daniel Hengstler4, Andreas Fleischmann4, Christian Enss4, and Thomas Stöhlker1,2,3 — 1HI-Jena, Jena — 2FSU, Jena — 3GSI, Darmstadt — 4KIP, Heidelberg
In the recent years, cryogenic MMCs have emerged as excellent single photon detectors, exhibiting a broad spectral acceptance range and a high energy resolution of E/Δ EFWHM ≈ 6000 [1]. Together with an adequate rise time, they represent a superb opportunity for fundamental research in atomic physics. However, the MMC absorbs a photon, generating a signal depending on its energy. The shape depends on the intrinsic detector response, noise and artefacts. To optimise performance, relevant pulse features must be extracted while suppressing noise. Several techniques involving finite impulse response (FIR) filters have been explored. Additional correction techniques are needed to mitigate the effects of integrated non-linearity and temperature drift of analog-to-digital converters gain. Finally, the drift in sensor sensitivity due to temperature fluctuations of the substrate must be considered. This work presents an overview of the involved steps and compares several FIR filter-based techniques. Two filters of particular interest for MMCs are the moving window deconvolution algorithm (Herdrich [2]) and the optimal filter (Fleischmann [3]). [1] J. Geist. PhD thesis, 2020; [2] M. O. Herdrich. PhD thesis, 2023; [3] A. Fleischmann. PhD thesis, 2003
Keywords: Metallic Magnetic Calorimeter (MMC); pulse shape analysis