Explanipedia

Improved Absolute Polarization Calibrator for BICEP CMB Polarimeters Open

Annie Polish, P. A. R. Ade, Zeeshan Ahmed, M. Amiri, D. Barkats , et al. · 2025

Cosmic birefringence is a hypothesized parity violation in electromagnetism that predicts a frequency-independent polarization rotation as light propagates. This would rotate the light from the Cosmic Microwave Background, producing an une…

BICEP/Keck XIX: Extremely Thin Composite Polymer Vacuum Windows for BICEP and Other High Throughput Millimeter Wave Telescopes Open

P. A. R. Ade, Zeeshan Ahmed, M. Amiri, D. Barkats, R. Basu Thakur , et al. · 2024

Millimeter-wave refracting telescopes targeting the degree-scale structure of the cosmic microwave background (CMB) have recently grown to diffraction-limited apertures of over 0.5 meters. These instruments are entirely housed in vacuum cr…

BICEP/Keck XVIII: Measurement of BICEP3 polarization angles and consequences for constraining cosmic birefringence and inflation Open

BICEP Keck Collaboration, NULL AUTHOR_ID, P. A. R. Ade, Zeeshan Ahmed, M. Amiri , et al. · 2024

We use a custom-made calibrator to measure individual detectors' polarization angles of BICEP3, a small aperture telescope observing the cosmic microwave background (CMB) at 95GHz from the South Pole. We describe our calibration strategy a…

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…

Development of the 220/270 GHz Receiver of BICEP Array Open

Y. Nakato, P. A. R. Ade, Zafar U. Ahmed, Mojtaba Amiri, D. Barkats , et al. · 2024

Measurements of B-mode polarization in the CMB sourced from primordial gravitational waves would provide information on the energy scale of inflation and its potential form. To achieve these goals, one must carefully characterize the Galac…

The Precursor Small Aperture Telescope (PreSAT) CMB polarimeter Open

Matthew A. Petroff, Zeeshan Ahmed, J. J. Bock, M. Dierickx, S. Fatigoni , et al. · 2024

The search for the polarized imprint of primordial gravitational waves in the cosmic microwave background (CMB) as direct evidence of cosmic inflation requires exquisite sensitivity and control over systematics. The next-generation CMB-S4 …

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

End-to-End Modeling of the TDM Readout System for CMB-S4 Open

D. C. Goldfinger, Zeeshan Ahmed, Darcy Barron, W. B. Doriese, Malcolm Durkin , et al. · 2024

Proceedings of the 58th Rencontres de Moriond on Cosmology 2024 Open

P. A. R. Ade, Zeeshan Ahmed, M. Amiri, D. Barkats, R. Basu Thakur , et al. · 2024

The BICEP/$\textit{Keck}$ (BK) series of cosmic microwave background (CMB) polarization experiments has, over the past decade and a half, produced a series of field-leading constraints on cosmic inflation via measurements of the "B-mode" p…

End-to-End Modeling of the TDM Readout System for CMB-S4 Open

D. C. Goldfinger, Zeeshan Ahmed, Darcy R. Barron, W. B. Doriese, Malcolm Durkin , et al. · 2023

The CMB-S4 experiment is developing next-generation ground-based microwave telescopes to observe the Cosmic Microwave Background with unprecedented sensitivity. This will require an order of magnitude increase in the 100 mK detector count,…

End-to-End Modeling of the TDM Readout System for CMB-S4 Open

D. C. Goldfinger, Zeeshan Ahmed, Darcy R. Barron, W. B. Doriese, Malcolm Durkin , et al. · 2023

The CMB-S4 experiment is developing next-generation ground-based microwave telescopes to observe the Cosmic Microwave Background with unprecedented sensitivity. This will require an order of magnitude increase in the 100 mK detector count,…

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

S. Fatigoni, P. A. R. Ade, Zeeshan Ahmed, M. Amiri, Denis Barkats , et al. · 2023

Time-Division Multiplexing is the readout architecture of choice for many groundand space experiments, as it is a very mature technology with proven outstandinglow-frequency noise stability, which represents a central challenge in multiple…

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…

BICEP/Keck. XVII. Line-of-sight Distortion Analysis: Estimates of Gravitational Lensing, Anisotropic Cosmic Birefringence, Patchy Reionization, and Systematic Errors Open

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

We present estimates of line-of-sight distortion fields derived from the 95 and 150 GHz data taken by BICEP2, BICEP3, and the Keck Array up to the 2018 observing season, leading to cosmological constraints and a study of instrumental and a…

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

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…

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…

Modeling a Three-Stage SQUID System in Space with the First Micro-X Sounding Rocket Flight Open

J. S. Adams, S. R. Bandler, N. Bastidon, Megan E. Eckart, E. Figueroa‐Feliciano , et al. · 2022

Micro-X Sounding Rocket Payload Re-flight Progress Open

J. S. Adams, S. R. Bandler, N. Bastidon, Megan E. Eckart, E. Figueroa‐Feliciano , et al. · 2022

Laminate polyethylene window development for large aperture millimeter receivers Open

Miranda Eiben, D. Barkats, Aurelia Balkanski, Sage Crystian, M. Dierickx , et al. · 2022

New experiments that target the B-mode polarization signals in the Cosmic Microwave Background require more sensitivity, more detectors, and thus larger-aperture millimeter-wavelength telescopes, than previous experiments. These larger ape…

Improved polarization calibration of the BICEP3 CMB polarimeter at the South Pole Open

James Cornelison, C. Vergès, Peter 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 …

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. · 2021

The BICEP/Keck series of experiments target the Cosmic Microwave Background at degree-scale resolution from the South Pole. Over the next few years, the "Stage-3" BICEP Array (BA) telescope will improve the program's frequency coverage and…

Micro-X Sounding Rocket Payload Re-flight Progress Open

J. S. Adams, E. Figueroa‐Feliciano, D. C. Goldfinger, A. Hubbard, Caroline A. Kilbourne , et al. · 2021

Micro-X is an X-ray sounding rocket payload that had its first flight on July 22, 2018. The goals of the first flight were to operate a transition edge sensor (TES) X-ray microcalorimeter array in space and take a high-resolution spectrum …

BICEP / Keck XV: The BICEP3 CMB Polarimeter and the First Three Year\n Data Set Open

P. A. R. Ade, Zeeshan Ahmed, M. Amiri, D. Barkats, R. Basu Thakur , et al. · 2021

We report on the design and performance of the BICEP3 instrument and its\nfirst three-year data set collected from 2016 to 2018. BICEP3 is a 52cm\naperture, refracting telescope designed to observe the polarization of the\ncosmic microwave…

A demonstration of improved constraints on primordial gravitational waves with delensing Open

P. A. R. Ade, Zeeshan Ahmed, M. Amiri, A. J. Anderson, Jason E. Austermann , et al. · 2021

We present a constraint on the tensor-to-scalar ratio, $r$, derived from measurements of cosmic microwave background (CMB) polarization $B$-modes with "delensing,'' whereby the uncertainty on $r$ contributed by the sample variance of the g…

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