Articles by John W. Appel

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John W. Appel

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High-Efficiency and Low-Noise Detectors for the Upgraded CLASS 90 GHz Focal Plane

19 November 2024 by Carolina Núñez and others

Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics

Sensitivity-Improved Polarization Maps at 40 GHz with CLASS and WMAP data

5 August 2024 by Rui Shi and others

Cosmology and Nongalactic Astrophysics

Cosmology Large Angular Scale Surveyor (CLASS): 90 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance

30 July 2024 by Rahul Datta and others

Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics

Design and characterization of a 60-cm reflective half-wave plate for the CLASS 90 GHz band telescope

12 July 2024 by Rui Shi and others

Instrumentation and Methods for Astrophysics

CLASS Angular Power Spectra and Map-Component Analysis for 40 GHz Observations through 2022

14 February 2024 by Joseph Eimer and others

Cosmology and Nongalactic Astrophysics

CLASS Observations of Atmospheric Cloud Polarization at Millimeter Wavelengths

13 September 2023 by Yunyang Li and others

Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics

Microwave Observations of Venus with CLASS

29 August 2023 by Sumit Dahal and others

Earth and Planetary Astrophysics, Instrumentation and Methods for Astrophysics

Testing CMB Anomalies in E-mode Polarization with Current and Future Data

10 April 2023 by Rui Shi and others

Cosmology and Nongalactic Astrophysics

On-sky performance of new 90 GHz detectors for the Cosmology Large Angular Scale Surveyor (CLASS)

23 March 2023 by Carolina Núñez and others

Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics

Calibration of Transition-edge Sensor (TES) Bolometer Arrays with Application to CLASS

9 October 2022 by John Appel and others

Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics

Construction of a Large Diameter Reflective Half-Wave Plate Modulator for Millimeter Wave Applications

11 August 2022 by Joseph Eimer and others

Instrumentation and Methods for Astrophysics, Astrophysics of Galaxies

Cosmology Large Angular Scale Surveyor (CLASS): Pointing Stability and Beam Measurements at 90, 150, and 220 GHz

9 August 2022 by Rahul Datta and others

Instrumentation and Methods for Astrophysics

Design and characterization of new 90 GHz detectors for the Cosmology Large Angular Scale Surveyor (CLASS)

9 August 2022 by Carolina Núñez and others

Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics

Long-Timescale Stability in CMB Observations at Multiple Frequencies using Front-End Polarization Modulation

9 August 2022 by Joseph Cleary and others

Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics

Four-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: On-sky Receiver Performance at 40, 90, 150, and 220 GHz Frequency Bands

9 February 2022 by Sumit Dahal and others

Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics

Venus Observations at 40 and 90 GHz with CLASS

12 April 2021 by Sumit Dahal and others

Earth and Planetary Astrophysics, Instrumentation and Methods for Astrophysics

The cross correlation of the ABS and ACT maps

6 January 2021 by Zack Li and others

Cosmology and Nongalactic Astrophysics

Two Year Cosmology Large Angular Scale Surveyor (CLASS) Observations: Long Timescale Stability Achieved with a Front-End Variable-delay Polarization Modulator at 40 GHz

31 December 2020 by Kathleen Harrington and others

Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics

Control and systems software for the Cosmology Large Angular Scale Surveyor (CLASS)

15 December 2020 by Matthew Petroff and others

Instrumentation and Methods for Astrophysics

Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: 40 GHz Telescope Pointing, Beam Profile, Window Function, and Polarization Performance

6 April 2020 by Zhilei Xu and others

Instrumentation and Methods for Astrophysics

Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A First Detection of Atmospheric Circular Polarization at Q Band

31 January 2020 by Matthew Petroff and others

Instrumentation and Methods for Astrophysics

The CLASS 150/220 GHz Polarimeter Array: Design, Assembly, and Characterization

17 January 2020 by Sumit Dahal and others

Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics

Two-year Cosmology Large Angular Scale Surveyor (CLASS) Observations: A Measurement of Circular Polarization at 40 GHz

1 November 2019 by Ivan Padilla and others

Cosmology and Nongalactic Astrophysics, Instrumentation and Methods for Astrophysics

On-sky performance of the CLASS Q-band telescope

10 May 2019 by John Appel and others

Instrumentation and Methods for Astrophysics

The Cosmology Large Angular Scale Surveyor Receiver Design

23 July 2018 by Jeffrey Iuliano and others

Instrumentation and Methods for Astrophysics

Design and characterization of the Cosmology Large Angular Scale Surveyor (CLASS) 93 GHz focal plane

11 July 2018 by Sumit Dahal and others

Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics

Variable-delay Polarization Modulators for the CLASS Telescopes

10 July 2018 by Kathleen Harrington and others

Instrumentation and Methods for Astrophysics

SiAl Alloy Feedhorn Arrays: Material Properties, Feedhorn Design, and Astrophysical Applications

9 July 2018 by Aamir Ali and others

Instrumentation and Methods for Astrophysics

A Projected Estimate of the Reionization Optical Depth Using the CLASS Experiment's Sample-Variance Limited E-Mode Measurement

10 January 2018 by Duncan Watts and others

Cosmology and Nongalactic Astrophysics

Silicon-Based Antenna-Coupled Polarization-Sensitive Millimeter-Wave Bolometer Arrays for Cosmic Microwave Background Instruments

30 August 2016 by Karwan Rostem and others

Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics

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Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics Earth and Planetary Astrophysics Atmospheric and Oceanic Physics Instrumentation and Detectors Astrophysics of Galaxies