Explanipedia

Evidence of enhanced two-level system loss suppression in high-Q, thin film aluminum microwave resonators Open

Carolyn G. Volpert, Emily M. Barrentine, Alberto D. Bolatto, Ari-David Brown, Jake Connors , et al. · 2024

As superconducting kinetic inductance detectors (KIDs) continue to grow in popularity for sensitive sub-mm detection and other applications, there is a drive to advance toward lower loss devices. We present measurements of diagnostic thin …

Calibration Measurements of the BICEP3 and BICEP Array CMB Polarimeters from 2017 to 2024 Open

Christos Giannakopoulos, C. Vergès, P. A. R. Ade, A. Zeeshan, M. Amiri , et al. · 2024

The BICEP3 and BICEP Array polarimeters are small-aperture refracting telescopes located at the South Pole designed to measure primordial gravitational wave signatures in the Cosmic Microwave Background (CMB) polarization, predicted by inf…

Superfluid-tight cryogenic receiver with continuous sub-Kelvin cooling for EXCLAIM Open

Sumit Dahal, P. A. R. Ade, Christopher Anderson, Alyssa Barlis, Emily M. Barrentine , et al. · 2024

The EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) is a\nballoon-borne telescope designed to survey star formation over cosmological\ntime scales using intensity mapping in the 420 - 540 GHz frequency range.\nEXCLAIM u…

A Vacuum Waveguide Filter Bank Spectrometer for Far-Infrared Astrophysics Open

Rong Nie, J. P. Filippini, E. J. Brooks, P. S. Barry, Jake Connors , et al. · 2024

Results and Limits of Time-Division Multiplexing for the BICEP Array High-Frequency Receivers Open

S. Fatigoni, P. A. R. Ade, Z. Ahmed, Morteza Hassanpour Amiri, D. Barkats , et al. · 2024

Optimization of an Optical Testbed for Characterization of EXCLAIM u-Spec Integrated Spectrometers Open

Rahmani Maryam, Emily M. Barrentine, Eric R. Switzer, Alyssa Barlis, Ari-David Brown , et al. · 2023

We describe a testbed to characterize the optical response of compact superconducting on-chip spectrometers in development for the Experiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) mission. EXCLAIM is a balloonborne far-i…

Development of Microwave Kinetic Inductance Detectors for a THz On-Chip Spectrometer Open

E. J. Brooks, P. S. Barry, Rong Nie, E. Shirokoff, J. P. Filippini , et al. · 2023

Far-infrared (FIR) wavelength light provides a wealth of information about astrophysical processes. Large field-of-view FIR spectrometers face a variety of challenges that can be bypassed by utilizing on-chip filter bank technology. To thi…

BICEP/Keck. XVI. Characterizing Dust Polarization through Correlations with Neutral Hydrogen Open

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

We characterize Galactic dust filaments by correlating BICEP/Keck and Planck data with polarization templates based on neutral hydrogen (H i ) observations. Dust polarization is important for both our understanding of astrophysical process…

On-Wafer Vector-Network-Analyzer Measurements at mK Temperatures Open

Elyse McEntee Wei, Richard Chamberlin, Nate Kilmer, Joshua M. Kast, Jake Connors , et al. · 2023

We describe a system for performing on-wafer vector-network-analyzer measurements from 100 MHz to 15 GHz at mK temperatures (i.e., less than 20 mK). We first demonstrate a camera-less probe positioning system and calibrate this system at 4…

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…

The Simons Observatory: Magnetic Shielding Measurements for the Universal Multiplexing Module Open

Zachary B. Huber, Yaqiong Li, Eve M. Vavagiakis, Steve K. Choi, Jake Connors , et al. · 2022

Optical Characterization of OMT-Coupled TES Bolometers for LiteBIRD Open

Johannes Hubmayr, P. A. R. Ade, Alexandre Adler, Erwan Allys, David Alonso , et al. · 2022

Tolerance Analysis of Octave Bandwidth Millimeter-Wave Planar Orthomode Transducer Open

Johannes Hubmayr, Jason E. Austermann, James A. Beall, Jake Connors, Shannon M. Duff , et al. · 2022

Planar Orthomode Transducers (OMTs) are commonly used for polarization measurements at millimeter wavelengths. We present an optical coupling study of an octave bandwidth planar OMT in circular waveguide based on 3D electromagnetic simulat…

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. · 2022

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 SQUID multi…

Optical Characterization & Testbed Development for μ-Spec Integrated Spectrometers Open

Rahmani Maryam, Alyssa Barlis, Emily M. Barrentine, Ari-David Brown, Berhanu T. Bulcha , et al. · 2022

This paper describes a cryogenic optical testbed developed to characterize u-Spec spectrometers in a dedicated dilution refrigerator (DR) system. u-Spec is a far-infrared integrated spectrometer that is an analog to a Rowland-type grating …

Developing a New Generation of Integrated Micro-Spec Far Infrared Spectrometers for the EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) Open

Carolyn G. Volpert, Emily M. Barrentine, Mona Mirzaei, Alyssa Barlis, Alberto D. Bolatto , et al. · 2022

The current state of far-infrared astronomy drives the need to develop compact, sensitive spectrometers for future space and ground-based instruments. Here we present details of the $\rm μ$-Spec spectrometers currently in development for t…

Bandwidth and Aliasing in the Microwave SQUID Multiplexer Open

Cyndia Yu, Zeeshan Ahmed, Jake Connors, John D'Ewart, Brad Dober , et al. · 2022

Improved Polarization Calibration of the BICEP3 CMB Polarimeter at the South Pole Open

J. Cornelison, C. Vergès, P. A. R. Ade, Zeeshan Ahmed, M. Amiri , et al. · 2022

The BICEP3 Polarimeter is a small aperture, refracting telescope, dedicated to the observation of the Cosmic Microwave Background (CMB) at 95GHz. It is designed to target degree angular scale polarization patterns, in particular the very-m…

Thermal testing for cryogenic CMB instrument optical design Open

D. C. Goldfinger, Peter A. R. Ade, Zeeshan Ahmed, M. Amiri, D. Barkats , et al. · 2022

Observations of the Cosmic Microwave Background rely on cryogenic instrumentation with cold detectors, readout, and optics providing the low noise performance and instrumental stability required to make more sensitive measurements. It is t…

The Latest Constraints on Inflationary B-modes from the BICEP/Keck Telescopes Open

Keck Collaboration, P. A. R. Ade, Zeeshan Ahmed, M. Amiri, D. Barkats , et al. · 2022

For the past decade, the BICEP/Keck collaboration has been operating a series of telescopes at the Amundsen-Scott South Pole Station measuring degree-scale $B$-mode polarization imprinted in the Cosmic Microwave Background (CMB) by primord…

Bicep/Keck XV: The Bicep3 Cosmic Microwave Background Polarimeter and the First Three-year Data Set Open

P. A. R. Ade, Zeeshan Ahmed, M. Amiri, D. Barkats, R. Basu Thakur , et al. · 2022

We report on the design and performance of the B icep3 instrument and its first three-year data set collected from 2016 to 2018. B icep3 is a 52 cm aperture refracting telescope designed to observe the polarization of the cosmic microwave …

BICEP/ XIV: Improved constraints on axionlike polarization oscillations in the cosmic microwave background Open

P. A. R. Ade, Zeeshan Ahmed, M. Amiri, D. Barkats, R. Basu Thakur , et al. · 2022

We present an improved search for axionlike polarization oscillations in the cosmic microwave background (CMB) with observations from the Keck Array. An all-sky, temporally sinusoidal rotation of CMB polarization, equivalent to a …

Experiment for cryogenic large-aperture intensity mapping: instrument design Open

Eric R. Switzer, Emily M. Barrentine, Giuseppe Cataldo, Thomas Essinger-Hileman, P. A. R. Ade , et al. · 2021

The experiment for cryogenic large-aperture intensity mapping (EXCLAIM) is a balloon-borne telescope designed to survey star formation in windows from the present to z = 3.5. During this time, the rate of star formation dropped dramaticall…

Erratum: “The Simons Observatory Large Aperture Telescope Receiver” (2021, ApJS, 256, 23) Open

Ningfeng Zhu, Tanay Bhandarkar, Gabriele Coppi, Anna M. Kofman, John Orlowski-Scherer , et al. · 2021

After the publication of the article, it was brought to our attention that the description of Equation (1) may cause potential confusion. Thus, we have decided to provide a newer reference and added a unit for qtot in the description. The …

The Simons Observatory: Magnetic Shielding Measurements for the Universal Multiplexing Module Open

Zachary B. Huber, Eve M. Vavagiakis, Steve K. Choi, Jake Connors, Nicholas F. Cothard , et al. · 2021

The Simons Observatory (SO) includes four telescopes that will measure the temperature and polarization of the cosmic microwave background using over 60,000 highly sensitive transition-edge bolometers (TES). These multichroic TES bolometer…

Optical Design of the EXperiment for Cryogenic Large-Aperture Intensity Mapping (EXCLAIM) Open

Thomas M. Essinger-Hileman, Trevor M. Oxholm, Gage L. Siebert, P. A. R. Ade, C.J. Anderson , et al. · 2020

This work describes the design and implementation of optics for EXCLAIM, the EXperiment for Cryogenic Large-Aperture Intensity Mapping. EXCLAIM is a balloon-borne telescope that will measure integrated line emission from carbon monoxide (C…

Assembly development for the Simons Observatory focal plane readout module Open

Erin Healy, Aamir Ali, Kam Arnold, Jason E. Austermann, James A. Beall , et al. · 2020

The Simons Observatory (SO) is a suite of instruments sensitive to\ntemperature and polarization of the cosmic microwave background (CMB) to be\nlocated at Cerro Toco in the Atacama Desert in Chile. Five telescopes, one\nlarge aperture tel…

Polarization calibration of the BICEP3 CMB polarimeter at the South Pole Open

James Cornelison, P. A. R. A. Ade, Zeeshan Ahmed, M. Amiri, Denis Barkats , et al. · 2020

International audience

The Simons Observatory: Magnetic Sensitivity Measurements of Microwave SQUID Multiplexers Open

Eve M. Vavagiakis, Zeeshan Ahmed, Aamir Ali, Kam Arnold, Jason E. Austermann , et al. · 2020

The Simons Observatory (SO) will be a cosmic microwave background (CMB) survey experiment with three small-aperture telescopes and one large-aperture telescope, which will observe from the Atacama Desert in Chile. In total, SO will field $…

Receiver development for BICEP Array, a next-generation CMB polarimeter at the South Pole Open

Lorenzo Moncelsi, P. A. R. Ade, Zeeshan Ahmed, M. Amiri, D. Barkats , et al. · 2020

A detection of curl-type ($B$-mode) polarization of the primary CMB would be direct evidence for the inflationary paradigm of the origin of the Universe. The BICEP/Keck Array (BK) program targets the degree angular scales, where the power …

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