Explanipedia

The Atacama Cosmology Telescope: DR6 power spectra, likelihoods and ΛCDM parameters Open

Thibaut Louis, Adrien La Posta, Zachary Atkins, Hidde T. Jense, Irene Abril-Cabezas , et al. · 2025

We present power spectra of the cosmic microwave background (CMB) anisotropy in temperature and polarization, measured from the Data Release 6 maps made from Atacama Cosmology Telescope (ACT) data. These cover 19,000 deg 2 of sky in bands …

Noise limits for dc SQUID readout of high-<i>Q</i> resonators below 300 MHz Open

Victoria Ankel, C. Bartram, J. Begin, Cynthia S. Bell, L. Brouwer , et al. · 2025

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…

The Atacama Cosmology Telescope: DR6 Maps Open

Sigurd Næss, Yilun Guan, Adriaan J. Duivenvoorden, Matthew Hasselfield, Yuhan Wang , et al. · 2025

We present Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) maps of the Cosmic Microwave Background temperature and polarization anisotropy at arcminute resolution over three frequency bands centered on 98, 150 and 220 GHz. The maps …

The Atacama Cosmology Telescope: DR6 Constraints on Extended Cosmological Models Open

Erminia Calabrese, J. Colin Hill, Hidde T. Jense, Adrien La Posta, Irene Abril-Cabezas , et al. · 2025

We use new cosmic microwave background (CMB) primary temperature and polarization anisotropy measurements from the Atacama Cosmology Telescope (ACT) Data Release 6 (DR6) to test foundational assumptions of the standard cosmological model a…

Analysis of Polarized Dust Emission Using Data from the First Flight of SPIDER Open

P. A. R. Ade, M. Amiri, Steven J. Benton, A. S. Bergman, R. Bihary , et al. · 2025

Using data from the first flight of Spider and from the Planck High Frequency Instrument, we probe the properties of polarized emission from interstellar dust in the Spider observing region. Component-separation algorithms operating in bot…

Analysis of Polarized Dust Emission Using Data from the First Flight of SPIDER Open

P. A. R. Ade, M. Amiri, Steven J. Benton, A. S. Bergman, Rick Bihary , et al. · 2024

Using data from the first flight of SPIDER and from Planck HFI, we probe the properties of polarized emission from interstellar dust in the SPIDER observing region. Component separation algorithms operating in both the spatial and harmonic…

Nanoscale Three-Dimensional Imaging of Integrated Circuits Using a Scanning Electron Microscope and Transition-Edge Sensor Spectrometer Open

Nathan Nakamura, Paul Szypryt, Amber L. Dagel, Bradley K. Alpert, D. A. Bennett , et al. · 2024

X-ray nanotomography is a powerful tool for the characterization of nanoscale materials and structures, but it is difficult to implement due to the competing requirements of X-ray flux and spot size. Due to this constraint, state-of-the-ar…

Physical Neighbor Crosstalk in Time Division Multiplexed SQUID Arrays for TES Readout Open

Malcolm Durkin, W. B. Doriese, Johnathon D. Gard, G. C. Hilton, Johannes Hubmayr , et al. · 2024

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…

Ultra-high-resolution alpha spectrometry for nuclear forensics and safeguards applications Open

M. K. Bacrania, Mark Croce, E. M. Bond, D. Dry, W. A. Moody , et al. · 2024

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…

The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters Open

Mathew S. Madhavacheril, Frank J. Qu, Blake D. Sherwin, N. MacCrann, Yaqiong Li , et al. · 2024

We present cosmological constraints from a gravitational lensing mass map covering 9400 deg 2 reconstructed from measurements of the cosmic microwave background (CMB) made by the Atacama Cosmology Telescope (ACT) from 2017 to 2021. In comb…

Axion Dark Matter eXperiment: Run 1A analysis details Open

C. Boutan, B. H. LaRoque, E. Lentz, N. S. Oblath, M. S. Taubman , et al. · 2024

The ADMX Collaboration gathered data for its Run 1A axion dark matter search from January 2017 to June 2017, scanning with an axion haloscope over the frequency range 645–680 MHz (2.66–2.81 μeV in axion mass) at Dine-Fischler-Srednicki-Zh…

Axion Dark Matter eXperiment: Run 1A Analysis Details Open

C. Boutan, B. H. LaRoque, E. Lentz, N. S. Oblath, M. S. Taubman , et al. · 2023

The ADMX collaboration gathered data for its Run 1A axion dark matter search from January to June 2017, scanning with an axion haloscope over the frequency range 645-680 MHz (2.66-2.81 ueV in axion mass) at DFSZ sensitivity. The resulting …

Measurement of gravitational lensing of the cosmic microwave background using SPT-3G 2018 data Open

Z. Pan, F. Bianchini, W. L. K. Wu, P. A. R. Ade, Zeeshan Ahmed , et al. · 2023

Here, we present a measurement of gravitational lensing over 1500deg2 of the Southern sky using SPT-3G temperature data at 95 GHz and 150 GHz taken in 2018. The lensing amplitude relative to a fiducial Planck 2018 Lambda cold dark matter (…

Status of the end-to-end demonstration readout chain for Athena/X-IFU Open

Gilles Roudil, F. Pajot, Florent Castellani, Sophie Beaumont, M. Dupieux , et al. · 2023

The X-ray Integral Field Unit (X-IFU) of the Athena observatory, scheduled for launch in the mid 2030's, will provide X-ray imaging spectroscopy data with unprecedented spectral and spatial resolution. The detection chain, based on a ~ 1.5…

BICEP Array: 150 GHz Detector Module Development Open

A. Schillaci, P. A. R. Ade, Zeeshan Ahmed, M. Amiri, D. Barkats , et al. · 2023

First flight performance of the Micro-X microcalorimeter X-ray sounding rocket Open

The Micro-X Collaboration, J. S. Adams, Robert J. Baker, S. R. Bandler, N. Bastidon , et al. · 2023

The flight of the Micro-X sounding rocket on July 22, 2018, marked the first operation of transition-edge sensors and their superconducting quantum interference device readouts in space. Here, the instrument combines the microcalorimeter a…

Integrating planar circuits with superconducting 3D microwave cavities using tunable low-loss couplers Open

Ziyi Zhao, Eva Gurra, Eric I. Rosenthal, Leila R. Vale, G. C. Hilton , et al. · 2023

We design and test a low-loss interface between superconducting three-dimensional microwave cavities and two-dimensional circuits, where the coupling rate is highly tunable. This interface seamlessly integrates a loop antenna and a Josephs…

Plastic Laminate Antireflective Coatings for Millimeter-Wave Optics in BICEP Array Open

M. Dierickx, P. A. R. Ade, Zeeshan Ahmed, M. Amiri, D. Barkats , et al. · 2023

New results from HAYSTAC’s phase II operation with a squeezed state receiver Open

M. J. Jewell, A. Leder, K. M. Backes, Xiran Bai, K. van Bibber , et al. · 2023

A search for dark matter axions with masses $>10\text{ }\text{ }\mathrm{\ensuremath{\mu}}\mathrm{eV}/{\mathrm{c}}^{2}$ has been performed using the HAYSTAC experiment's squeezed state receiver to achieve subquantum limited noise. This work…

Proof-of-Principle Experiment for Testing Strong-Field Quantum Electrodynamics with Exotic Atoms: High Precision X-Ray Spectroscopy of Muonic Neon Open

T. Okumura, T. Azuma, D. A. Bennett, I. Chiu, W. B. Doriese , et al. · 2023

To test bound-state quantum electrodynamics (BSQED) in the strong-field regime, we have performed high precision x-ray spectroscopy of the 5g-4f and 5f- 4d transitions (BSQED contribution of 2.4 and 5.2 eV, respectively) of muonic neon ato…

Integrating planar circuits with superconducting 3D microwave cavities using tunable low-loss couplers Open

Ziyi Zhao, Eva Gurra, Eric I. Rosenthal, Leila R. Vale, G. C. Hilton , et al. · 2023

We design and test a low-loss interface between superconducting 3-dimensional microwave cavities and 2-dimensional circuits, where the coupling rate is highly tunable. This interface seamlessly integrates a loop antenna and a Josephson jun…

Simultaneous Millimeter-wave, Gamma-Ray, and Optical Monitoring of the Blazar PKS 2326-502 during a Flaring State Open

J. C. Hood, A. Simpson, Alex McDaniel, A. Foster, P. A. R. Ade , et al. · 2023

Including millimeter-wave data in multiwavelength studies of the variability of active galactic nuclei (AGN) can provide insights into AGN physics that are not easily accessible at other wavelengths. We demonstrate in this work the potenti…

New Results from HAYSTAC's Phase II Operation with a Squeezed State Receiver Open

M. J. Jewell, A. Leder, K. M. Backes, Xiran Bai, K. van Bibber , et al. · 2023

A search for dark matter axions with masses $>10 μeV/c^{2}$ has been performed using the HAYSTAC experiment's squeezed state receiver to achieve sub-quantum limited noise. This report includes details of the design and operation of the exp…

The status of the HOLMES experiment Open

Luca Origo, Bradley K. Alpert, M. Balata, Daniel Becker, D. A. Bennett , et al. · 2023

This work summarizes the current status of HOLMES, a calorimetric experiment for the direct neutrino mass measurement. The state-of-the-art in this field is represented by the KATRIN spectrometer that is under data-taking aiming at a sensi…

SLAC microresonator RF (SMuRF) electronics: A tone-tracking readout system for superconducting microwave resonator arrays Open

Cyndia Yu, Zeeshan Ahmed, J. Frisch, Shawn Henderson, Maximiliano Silva-Feaver , et al. · 2023

We describe the newest generation of the SLAC Microresonator RF (SMuRF) electronics, a warm digital control and readout system for microwave-frequency resonator-based cryogenic detector and multiplexer systems, such as microwave supercondu…

Status of HOLMES, an experiment for measuring the nu mass Open

E. Ferri, Bradley K. Alpert, M. Balata, Daniel Becker, D. A. Bennett , et al. · 2022

One of the major challenges in nowadays particle physics and astrophysics is the determination of the absolute neutrino mass scale. The HOLMES experiment aims at exploiting the calorimetric approach to directly measure the neutrino mass th…

First Flight Performance of the Micro-X Microcalorimeter X-Ray Sounding Rocket Open

J. S. Adams, Robert J. Baker, S. R. Bandler, N. Bastidon, Daniel Castro , et al. · 2022

The flight of the Micro-X sounding rocket on July 22, 2018 marked the first operation of Transition-Edge Sensors and their SQUID readouts in space. The instrument combines the microcalorimeter array with an imaging mirror to take high-reso…

A tabletop x-ray tomography instrument for nanometer-scale imaging: demonstration of the 1,000-element transition-edge sensor subarray Open

Paul Szypryt, Nathan Nakamura, Daniel Becker, D. A. Bennett, Amber L. Dagel , et al. · 2022

We report on the 1,000-element transition-edge sensor (TES) x-ray spectrometer implementation of the TOMographic Circuit Analysis Tool (TOMCAT). TOMCAT combines a high spatial resolution scanning electron microscope (SEM) with a highly eff…

Nanoscale Three-Dimensional Imaging of Integrated Circuits using a Scanning Electron Microscope and Transition-Edge Sensor Spectrometer Open

Nathan Nakamura, Paul Szypryt, Amber L. Dagel, Bradley K. Alpert, D. A. Bennett , et al. · 2022

X-ray nanotomography is a powerful tool for the characterization of nanoscale materials and structures, but is difficult to implement due to competing requirements on X-ray flux and spot size. Due to this constraint, state-of-the-art nanot…

A 50 mK test bench for demonstration of the readout chain of Athena/X-IFU Open

Florent Castellani, Sophie Beaumont, F. Pajot, Gilles Roudil, Joseph Adams , et al. · 2022

The X-IFU (X-ray Integral Field Unit) onboard the large ESA mission Athena (Advanced Telescope for High ENergy Astrophysics), planned to be launched in the mid 2030s, will be a cryogenic X-ray imaging spectrometer operating at 55 mK. It wi…

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