D. R. Schmidt
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View article: Lithographic integration of TES microcalorimeters with SQUID multiplexer circuits for large format spectrometers
Lithographic integration of TES microcalorimeters with SQUID multiplexer circuits for large format spectrometers Open
Arrays of hundreds or thousands of low temperature detectors have been deployed for many experiments, both bolometers for long wavelength applications and calorimeters for shorter wavelength applications. One challenge that is common to ma…
View article: Most Stringent Bound on Electron Neutrino Mass Obtained with a Scalable Low-Temperature Microcalorimeter Array
Most Stringent Bound on Electron Neutrino Mass Obtained with a Scalable Low-Temperature Microcalorimeter Array Open
The determination of the absolute neutrino mass scale remains a fundamental open question in particle physics, with profound implications for both the standard model and cosmology. Direct kinematic measurements, independent of model-depend…
View article: Applications of ultra-high resolution microcalorimeter gamma-ray spectrometry
Applications of ultra-high resolution microcalorimeter gamma-ray spectrometry Open
Ultra-high energy resolution microcalorimeter gamma-ray spectroscopy—with energy resolution 5 to 10 times better than observed in spectra obtained by commercial-off-the-shelf high purity germanium detectors—is an enabling technology for ul…
View article: Noise limits for dc SQUID readout of high-<i>Q</i> resonators below 300 MHz
Noise limits for dc SQUID readout of high-<i>Q</i> resonators below 300 MHz Open
We present the limits on noise for the readout of cryogenic high-Q resonators using dc Superconducting Quantum Interference Devices (SQUIDs) below 300 MHz. This analysis uses realized first-stage SQUIDs (previously published), whose perfor…
View article: Primary activity measurement of an Am-241 solution using microgram inkjet gravimetry and decay energy spectrometry
Primary activity measurement of an Am-241 solution using microgram inkjet gravimetry and decay energy spectrometry Open
We demonstrate a method for radionuclide assay that is spectroscopic with 100% counting efficiency for alpha decay. Advancing both cryogenic decay energy spectrometry (DES) and drop-on-demand inkjet metrology, a solution of Am-241 was assa…
View article: Towards Precision Spectroscopy of Antiprotonic Atoms for Probing Strong-field QED
Towards Precision Spectroscopy of Antiprotonic Atoms for Probing Strong-field QED Open
PAX (antiProtonic Atom X-ray spectroscopy) is a new experiment with the aim to test strong-field quantum electrodynamics (QED) effects by performing high-precision x-ray spectroscopy of antiprotonic atoms. By utilizing advanced microcalori…
View article: Towards Precision Spectroscopy of Antiprotonic Atoms for Probing Strong-field QED
Towards Precision Spectroscopy of Antiprotonic Atoms for Probing Strong-field QED Open
PAX (antiProtonic Atom X-ray spectroscopy) is a new experiment with the aim to test strong-field quantum electrodynamics (QED) effects by performing high-precision x-ray spectroscopy of antiprotonic atoms. By utilizing advanced microcalori…
View article: A High-Speed, High-Resolution Transition Edge Sensor Spectrometer for Soft X-Rays at the Advanced Photon Source
A High-Speed, High-Resolution Transition Edge Sensor Spectrometer for Soft X-Rays at the Advanced Photon Source Open
This project explores the design and development of a transition edge sensor (TES) spectrometer for resonant soft X-ray scattering (RSXS) measurements developed in collaboration between Argonne National Laboratory (ANL) and the National In…
View article: Effects of Stray Magnetic Field on Transition-Edge Sensors in Gamma-Ray Microcalorimeters
Effects of Stray Magnetic Field on Transition-Edge Sensors in Gamma-Ray Microcalorimeters Open
Superconducting transition-edge sensors (TESs) used in X-ray and $$\gamma$$ -ray microcalorimeters suffer degraded performance if cooled in a magnetic field B sufficient to trap flux in the sensors. We report measurements of $$\gamma$$ …
View article: Physical Neighbor Crosstalk in Time Division Multiplexed SQUID Arrays for TES Readout
Physical Neighbor Crosstalk in Time Division Multiplexed SQUID Arrays for TES Readout Open
Time division SQUID multiplexing is being developed as the TES readout technology for the ATHENA X-ray integral field unit and CMB-S4. Close packing of TDM and dc-biased SQUID components is motivated by chip area constraints but has result…
View article: Ultra-high-resolution alpha spectrometry for nuclear forensics and safeguards applications
Ultra-high-resolution alpha spectrometry for nuclear forensics and safeguards applications Open
We will present our work on the development of ultra-high-resolution detectors for alpha particle spectrometry. These detectors, based on superconducting transition-edge sensors, offer energy resolution that is five to ten times better tha…
View article: Metal-metal attachment of absorbers for Gamma-Ray TES
Metal-metal attachment of absorbers for Gamma-Ray TES Open
In this work, we are reporting on the development of a method to attach Sn absorbers to the Transition Edge Sensors (TESs) with BiSn spheres (metal-to-metal attachment), using a die bonder, with the aim of improving thermalization, potenti…
View article: Improved microwave SQUID multiplexer readout using a kinetic-inductance traveling-wave parametric amplifier
Improved microwave SQUID multiplexer readout using a kinetic-inductance traveling-wave parametric amplifier Open
We report on the use of a kinetic-inductance traveling-wave parametric amplifier (KITWPA) as the first amplifier in the readout chain of a microwave superconducting quantum interference device (SQUID) multiplexer (μmux). This μmux is desig…
View article: Micrometrology in pursuit of quantum radiation standards
Micrometrology in pursuit of quantum radiation standards Open
With the recent redefinition of the SI base units in terms of constants of nature, the race is on to maximize achievable precision by developing primary standards based on quantum metrology, thereby to realize the Quantum SI. For the becqu…
View article: Advancing the in-situ characterization of light elements via X-ray absorption spectroscopy using superconducting detectors
Advancing the in-situ characterization of light elements via X-ray absorption spectroscopy using superconducting detectors Open
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View article: A model for excess Johnson noise in superconducting transition-edge sensors
A model for excess Johnson noise in superconducting transition-edge sensors Open
Transition-edge sensors (TESs) are two-dimensional superconducting films utilized as highly sensitive detectors of energy or power. These detectors are voltage biased in the superconducting-normal transition where the film resistance is bo…
View article: Hyperspectral X-Ray Imaging: Progress Towards Chemical Analysis in the SEM
Hyperspectral X-Ray Imaging: Progress Towards Chemical Analysis in the SEM Open
The Hyperspectral X-ray Imaging (HXI) project will enable non-destructive chemical-state determination of nano-scale samples in the electron microscope for nuclear safeguards applications. To efficiently measure chemical state through elec…
View article: New Experimentally Observable Gamma-ray Emissions from 241Am Nuclear Decay
New Experimentally Observable Gamma-ray Emissions from 241Am Nuclear Decay Open
With the high resolution of microcalorimeter detectors, previously unresolvable gamma-ray lines are now clearly resolvable. A careful measurement of Am-241 decay with a large array of gamma-ray microcalorimeters has revealed never before s…
View article: Design of a 3000-Pixel Transition-Edge Sensor X-Ray Spectrometer for Microcircuit Tomography
Design of a 3000-Pixel Transition-Edge Sensor X-Ray Spectrometer for Microcircuit Tomography Open
Feature sizes in integrated circuits have decreased substantially over time, and it has become increasingly difficult to three-dimensionally image these complex circuits after fabrication. This can be important for process development, def…
View article: Measurement of Ac227 Impurity in Ac225 using Decay Energy Spectroscopy
Measurement of Ac227 Impurity in Ac225 using Decay Energy Spectroscopy Open
225Ac is a valuable medical radionuclide for targeted alpha therapy, but 227Ac is an undesirable byproduct of an accelerator-based synthesis method under investigation. Sufficient detector sensitivity is critical for quantifying the trace …
View article: Soft X-ray spectroscopy with transition-edge sensors at Stanford Synchrotron Radiation Lightsource beamline 10-1
Soft X-ray spectroscopy with transition-edge sensors at Stanford Synchrotron Radiation Lightsource beamline 10-1 Open
We present results obtained with a new soft X-ray spectrometer based on transition-edge sensors (TESs) composed of Mo/Cu bilayers coupled to bismuth absorbers. This spectrometer simultaneously provides excellent energy resolution, high det…
View article: Working principle and demonstrator of microwave-multiplexing for the HOLMES experiment microcalorimeters
Working principle and demonstrator of microwave-multiplexing for the HOLMES experiment microcalorimeters Open
The determination of the neutrino mass is an open issue in modern particle physics and astrophysics. The direct mass measurement is the only theory-unrelated experimental tool capable to probe such quantity. The HOLMES experiment aims to m…
View article: Controlling the thermal conductance of silicon nitride membranes at 100 mK temperatures with patterned metal features
Controlling the thermal conductance of silicon nitride membranes at 100 mK temperatures with patterned metal features Open
Freestanding micromachined membranes are often used for thermal isolation in electronic devices such as photon sensors. The degree of thermal isolation plays an important role in determining device performance, and so the ability to suppre…
View article: Configurable error correction of code-division multiplexed TES detectors with a cryotron switch
Configurable error correction of code-division multiplexed TES detectors with a cryotron switch Open
The development of a superconducting analog to the transistor with extremely low power dissipation will accelerate the proliferation of low-temperature circuitry operating in the milliKelvin regime. The thin-film, magnetically actuated cry…
View article: Microwave SQUID multiplexing for the Lynx x-ray microcalorimeter
Microwave SQUID multiplexing for the Lynx x-ray microcalorimeter Open
The Lynx x-ray microcalorimeter (LXM) is an imaging spectrometer for the Lynx satellite mission, an x-ray telescope being considered by NASA to be a new flagship mission. Lynx will enable unique astrophysical observations into the x-ray un…