Publications (28)
Improved limit on the effective electron neutrino mass with the ECHo-1k experiment
Fabienne Adam, Felix Ahrens, Luis E. Ardila Perez +56
The effective electron neutrino mass can be determined by analyzing the endpoint region of the Ho electron capture spectrum, provided a measurement with high energy resolut…
DELight: a Direct search Experiment for Light dark matter with superfluid helium
Belina von Krosigk, Klaus Eitel, Christian Enss +9
To reach ultra-low detection thresholds necessary to probe unprecedentedly low Dark Matter masses, target material alternatives and novel detector designs are essential. One such t…
CryoDE: a Digital Cryogenic Detector Emulator for Microwave SQUID Multiplexed Systems
Timo Muscheid, Daniel Crovo, Robert Gartmann +4
Simultaneous readout of large-scale cryogenic detector arrays relies on multiplexing schemes such as the FDM (Frequency-Division Multiplexing) with microwave SQUID multiplexers and…
Analytical model of the readout power and SQUID hysteresis parameter dependence of the resonator characteristics of microwave SQUID multiplexers
Mathias Wegner, Christian Enss, Sebastian Kempf
We report on the development of an analytical model describing the readout power and SQUID hysteresis parameter dependence of the resonator characteristics used for frequency encod…
S2Doc -- Spatial-Semantic Document Format
Sebastian Kempf, Frank Puppe
Documents are a common way to store and share information, with tables being an important part of many documents. However, there is no real common understanding of how to model doc…
Optimum filter-based analysis for the characterization of a high-resolution magnetic microcalorimeter towards the DELight experiment
Francesco Toschi, Benedikt Maier, Greta Heine +4
Ultra-sensitive cryogenic calorimeters have become a favored technology with widespread application where eV-scale energy resolutions are needed. In this article, we characterize t…
Simulation framework for microwave SQUID multiplexer optimization
Constantin Schuster, Mathias Wegner, Sebastian Kempf
So far, performance prediction and optimization of microwave SQUID multiplexers has largely been based on simple approximate analytical models and experimental results. This is cau…
Advanced microwave SQUID multiplexer model incorporating readout power effects and Josephson junction inhomogeneities
Martin Neidig, Mathias Wegner, Sebastian Kempf
We present an advanced model for describing the readout power dependence of the resonance characteristics of a microwave SQUID multiplexer. Our model proves valid for SQUID screeni…
Poly- and single-crystalline diamond nitrogen-induced TLS losses estimation with superconducting lumped elements micro-resonators
Francesco Mazzocchi, Martin Neidig, Hideaki Yamada +3
Research on diamond has intensified due to its exceptional thermal, optical, and mechanical properties, making it a key material in quantum technologies and high-power applications…
Measurements of absolute gamma-ray energies using an ultra-high energy resolution magnetic microcalorimeter
Matias Rodrigues, Mostafa L. Zahir, Martin Loidl +6
We present new measurements of 27 gamma ray energies ranging from 14 keV to 136 keV, obtained using high-energy-resolution magnetic microcalorimeters for energy-dispersive spectrom…
Design considerations for the optimization of λ-SQUIDs
Constantin Schuster, Sebastian Kempf
Cryogenic microcalorimeters are key tools for high-resolution X-ray spectroscopy due to their excellent energy resolution and quantum efficiency close to 100%. Multiple types of mi…
Software-defined Radio Readout System for the ECHo Experiment
Oliver Sander, Nick Karcher, Oliver Krömer +4
Metallic magnetic calorimeters (MMCs) are cryogenic detectors that offer an excellent energy resolution, a signal rise time of <100 ns, a high dynamic range and almost optimal line…
Flux ramp modulation based MHz frequency-division dc-SQUID multiplexer
Daniel Richter, Ludwig Hoibl, Thomas Wolber +6
We present a MHz frequency-division dc-SQUID multiplexer that is based on flux ramp modulation and a series array of identical current-sensing dc-SQUIDs with tightly coupled in…
Specific Heat of Holmium in Gold and Silver at Low Temperatures
Matthew Herbst, Andreas Reifenberger, Clemens Velte +10
The specific heat of dilute alloys of holmium in gold and in silver plays a major role in the optimization of low temperature microcalorimeters with enclosed , s…
Advanced fabrication process for particle absorbers of highly pure electroplated gold for microcalorimeter applications
Michael Müller, Ria-Helen Zühlke, Sebastian Kempf
Magnetic microcalorimeters (MMCs) have become a key technology for applications requiring outstanding energy resolution, fast signal rise time and excellent linearity. MMCs measure…
High precision measurement of the Tc spectrum
Michael Paulsen, Philipp Ranitzsch, Martin Loidl +11
Highly precise measurements of the Tc beta spectrum were performed in two laboratories using metallic magnetic calorimeters. Independent sample preparations, evaluation meth…
Magnetic microcalorimeter with paramagnetic temperature sensors and integrated dc-SQUID readout for high-resolution X-ray emission spectroscopy
Matthäus Krantz, Francesco Toschi, Benedikt Maier +3
We present two variants of a magnetic microcalorimeter with paramagnetic temperature sensors and integrated dc-SQUID readout for high-resolution X-ray emission spectroscopy. Each v…
Magnetic microcalorimeters for primary activity standardization within the EMPIR project PrimA-LTD
Michael Müller, Matias Rodrigues, Jörn Beyer +2
The precision of existing decay data of radionuclides for activity determination is often a limitation for actual applications in science, society, and industry. For this reason, t…
Anodization-free fabrication process for high-quality cross-type Josephson tunnel junctions based on a Nb/Al-AlO/Nb trilayer
Fabienne Adam, Christian Enss, Sebastian Kempf
Josephson tunnel junctions form the basis for various superconducting electronic devices. For this reason, enormous efforts are routinely taken to establish and later on maintain a…
Measurement of the Th isomer energy with a magnetic micro-calorimeter
Tomas Sikorsky, Jeschua Geist, Daniel Hengstler +13
We present a measurement of the low-energy (0--60keV) ray spectrum produced in the -decay of U using a dedicated cryogenic magnetic micro-calorimeter. The ener…
Comparison of the detector response and calibration function of metallic microcalorimeters for X-ray photons and external electrons
Neven Kovac, Fabienne Adam, Sebastian Kempf +6
Metallic microcalorimeters (MMCs) are cryogenic single-particle detectors that rely on a calorimetric detection principle. Due to their excellent energy resolution, close-to-ideal…
Suitability of Magnetic Microbolometers based on Paramagnetic Temperature Sensors for CMB Polarization Measurements
Juan Manuel Geria, Matias Rolf Hampel, Sebastian Kempf +10
High resolution maps of polarization anisotropies of the Cosmic Microwave Background (CMB) are in high demand, since the discovery of primordial B-Modes in the polarization pattern…
Simultaneous MMC readout using a tailored μMUX based readout system
Daniel Richter, Mathias Wegner, Felix Ahrens +7
Magnetic microcalorimeters (MMCs) are cryogenic, energy-dispersive single-particle detectors providing excellent energy resolution, intrinsically fast signal rise time, quantum eff…
Flux ramp modulation based hybrid microwave SQUID multiplexer
Constantin Schuster, Mathias Wegner, Christian Enss +1
We present a hybrid microwave SQUID multiplexer that combines two frequency-division multiplexing techniques to allow multiplexing a given number of cryogenic detectors with only a…
Signal partitioning in superfluid He: a Monte Carlo approach
Francesco Toschi, Axel Brunold, Lea Burmeister +16
Superfluid He is an ideal candidate for the direct detection of light dark matter via nuclear recoils thanks to its low nuclear mass and the possibility to reach a low detect…
SQUID-based superconducting microcalorimeter with in-situ tunable gain
Constantin Schuster, Sebastian Kempf
Cryogenic microcalorimeters are outstanding tools for X-ray spectroscopy due to their unique combination of excellent energy resolution and close to 100% detection efficiency. Whil…
Development of a novel calorimetry setup based on metallic paramagnetic temperature sensors
Andreas Reifenberger, Andreas Reiser, Sebastian Kempf +2
We have developed a new micro-fabricated platform for the measurement of the specific heat of low heat capacity mg-sized metallic samples, such as superconductors, down to temperat…
Mutual Inductance Sensing SQUID: Cryogenic microcalorimeter based on mutual inductance readout of superconducting temperature sensors
Jodok Zeuner, Constantin Schuster, Sebastian Kempf
Superconducting microcalorimeters, such as superconducting transition-edge sensors and magnetic microcalorimeters, have emerged as state-of-the-art detectors for X-ray emission spe…