Heather McCarrick
A5010797363- Superconducting and THz Device Technology
- Radio Astronomy Observations and Technology
- Microwave Engineering and Waveguides
- Radio Frequency Integrated Circuit Design
- Physics of Superconductivity and Magnetism
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Advanced Thermodynamic Systems and Engines
- Geophysics and Gravity Measurements
- Terahertz technology and applications
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Precipitation Measurement and Analysis
- Astrophysics and Cosmic Phenomena
- Quantum Computing Algorithms and Architecture
- Advanced Frequency and Time Standards
- Quantum and electron transport phenomena
- Quantum Information and Cryptography
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Cryospheric studies and observations
- Radio, Podcasts, and Digital Media
- Soil Moisture and Remote Sensing
- Climate variability and models
Princeton University
2019-2022
Stanford University
2017-2021
SLAC National Accelerator Laboratory
2017-2021
Kavli Institute for Particle Astrophysics and Cosmology
2021
University of California, San Diego
2021
National Institute of Standards and Technology
2021
University of Colorado Boulder
2021
California University of Pennsylvania
2020
Columbia University
2013-2018
Arizona State University
2014-2017
A microwave SQUID multiplexer ($\mu$MUX) has been optimized for coupling to large arrays of superconducting transition-edge sensor (TES) bolometers. We present the scalable cryogenic chip design in a 1820-channel configuration 4-8 GHz rf band. The key metrics yield, sensitivity, and crosstalk are determined through measurements 455 readout channels, which span 4-5 GHz. median white-noise level is 45 pA/$\sqrt{\textrm{Hz}}$, evaluated at 2 Hz, with 1/f knee $\leq$ 20 mHz after common-mode...
Abstract We quantify the calibration requirements for systematic uncertainties next-generation ground-based observatories targeting large-angle B-mode polarization of Cosmic Microwave Background, with a focus on Simons Observatory (SO). explore gain calibration, bandpass center frequencies, and angles, including frequency variation latter across bandpass. find that frequencies must be known to percent levels or less avoid biases tensor-to-scalar ratio r order Δ r∼10 -3 , in line previous...
Observing in six frequency bands from 27 to 280 GHz over a large sky area, the Simons Observatory (SO) is poised address many questions Galactic astrophysics addition its principal cosmological goals. In this work, we provide quantitative forecasts on astrophysical parameters of interest for range science cases. We find that SO can: constrain spectrum polarized dust emission at level $\Delta\beta_d \lesssim 0.01$ and thus test models composition predict $\beta_d$ polarization differs...
We discuss the design, fabrication, and testing of prototype horn-coupled, lumped-element kinetic inductance detectors (LEKIDs) designed for cosmic microwave background studies. The LEKIDs are made from a thin aluminum film deposited on silicon wafer patterned using standard photolithographic techniques at STAR Cryoelectronics, commercial device foundry. fabricated 20-element arrays, optimized spectral band centered 150 GHz, to test sensitivity yield devices as well multiplexing scheme....
Aims. Lumped-element kinetic inductance detectors (LEKIDs) are an attractive technology for millimeter-wave observations that require large arrays of extremely low-noise detectors. We designed, fabricated and characterized 64-element (128 LEKID) horn-coupled, dual-polarization LEKIDs optimized ground-based CMB polarimetry. Our devices sensitive to two orthogonal polarizations in a single spectral band centered on 150 GHz with Δ ν ∕ = 0.2. The 65 × mm square designed be tiled into the focal...
A critical challenge in developing scalable error-corrected quantum systems is the accumulation of errors while performing operations and measurements. One promising approach to design a system where can be detected converted into erasures. Such utilizing erasure qubits are known have relaxed requirements for error correction. recent proposal aims do this using dual-rail encoding with superconducting cavities. However, experimental characterization demonstration cavity qubit has not yet been...
We present a technique for increasing the internal quality factor of kinetic inductance detectors (KIDs) by nulling ambient magnetic fields with properly applied field. The KIDs used in this study are made from thin-film aluminum, they mounted inside light-tight package bulk and operated near 150 mK. Since aluminum has slightly elevated critical temperature (Tc = 1.4 K), it therefore transitions before 1.2 which also serves as shield. On cooldown, small approximately 30 µT can produce...
We report photon-noise limited performance of horn-coupled, aluminum lumped-element kinetic inductance detectors at millimeter wavelengths. The are illuminated by a millimeter-wave source that uses an active multiplier chain to produce radiation between 140 and 160 GHz. feed the with either amplified broadband noise or continuous-wave tone from microwave signal generator. demonstrate detector response over 40 dB range power is well-described simple model considers number quasiparticles....
The Simons Observatory (SO) is a cosmic microwave background (CMB) experiment from the Atacama Desert in Chile comprising three small-aperture telescopes (SATs) and one large-aperture telescope (LAT). In total, SO will field over 60,000 transition-edge sensor (TES) bolometers six spectral bands centered between 27 280 GHz order to achieve sensitivity necessary measure or constrain numerous cosmological quantities. this work, we focus on SATs which are optimized search for primordial...
We present the results of a feasibility study, which examined deployment ground-based millimeter-wave polarimeter, tailored for observing cosmic microwave background (CMB), to Isi Station in Greenland. The instrument this study is based on lumped-element kinetic inductance detectors (LEKIDs) and an F/2.4 catoptric, crossed-Dragone telescope with 500 mm aperture. mounted inside receiver cooled $<\,4$ K by closed-cycle $^4$He refrigerator reduce loading detectors. Linearly polarized signals...
Abstract The Simons Observatory is a Cosmic Microwave Background experiment to observe the microwave sky in six frequency bands from 30 290 GHz. Observatory—at ∼5200 m altitude—comprises three Small Aperture Telescopes and one Large Telescope (LAT) at Atacama Desert, Chile. This research note describes design current status of LAT along with its future timeline.
The Simons Observatory (SO) is a suite of instruments sensitive to temperature and polarization the cosmic microwave background (CMB) be located at Cerro Toco in Atacama Desert Chile. Five telescopes, one large aperture telescope four small will host roughly 70,000 highly multiplexed transition edge sensor (TES) detectors operated 100 mK. Each SO focal plane module (UFM) couples 1,764 TESes resonators multiplexing (uMux) readout circuit. Before detector integration, mK uMux components are...
The Simons Observatory (SO) will observe the cosmic microwave background (CMB) from Cerro Toco in Atacama Desert of Chile. observatory consists three 0.5m Small Aperture Telescopes (SATs) and one 6m Large Telescope (LAT), covering six frequency bands centering around 30, 40, 90, 150, 230, 280 GHz. SO observations transform our understanding universe by characterizing properties early universe, measuring number relativistic species mass neutrinos, improving galaxy evolution, constraining...
We report on the development of scalable prototype microwave kinetic inductance detector (MKID) arrays tailored for future multi-kilo-pixel experiments that are designed to simultaneously characterize polarization properties both cosmic background (CMB) and Galactic dust emission. These modular composed horn-coupled, polarization-sensitive MKIDs, each pixel has four detectors: two polarizations in spectral bands between 125 280 GHz. A horn is used feed array element, a planar orthomode...
The Simons Observatory (SO) will be a cosmic microwave background (CMB) survey experiment with three small-aperture telescopes and one large-aperture telescope, which observe from the Atacama Desert in Chile. In total, SO field ~70,000 transition-edge sensor (TES) bolometers six spectral bands centered between 27 280 GHz order to achieve sensitivity necessary measure or constrain numerous cosmological quantities. Universal Focal Plane Modules (UFMs) each contain 150 mm diameter TES detector...
Abstract The Simons Observatory is a ground-based cosmic microwave background experiment that consists of three 0.4 m small-aperture telescopes and one 6 Large Aperture Telescope, located at an elevation 5300 on Cerro Toco in Chile. Telescope Receiver (LATR) the cryogenic camera will be coupled to Telescope. resulting instrument produce arcminute-resolution millimeter-wave maps half sky with unprecedented precision. LATR largest built date, diameter 2.4 length 2.6 m. coldest stage cooled 100...
We discuss the design considerations and initial measurements from arrays of dual-polarization, lumped element kinetic inductance detectors (LEKIDs) nominally designed for cosmic microwave background (CMB) studies. The are horn-coupled, each array contains two single-polarization LEKIDs, which made thin-film aluminum optimized a single spectral band centered on 150 GHz. developing architectures, one based 160 micron thick silicon wafers other silicon-on-insulator (SOI) with 30 device layer....
Aluminum lumped-element kinetic inductance detectors (LEKIDs) sensitive to millimeter-wave photons have been shown exhibit high quality factors, making them highly and multiplexable. The superconducting gap of aluminum limits LEKIDs photon frequencies above 100 GHz. Manganese-doped (Al-Mn) has a tunable critical temperature could therefore be an attractive material for below GHz if the internal factor remains sufficiently when manganese is added film. To investigate, we measured some key...