Samantha Walker
A5053130867- Superconducting and THz Device Technology
- Radio Astronomy Observations and Technology
- Radio Frequency Integrated Circuit Design
- Physics of Superconductivity and Magnetism
- Thermal Radiation and Cooling Technologies
- Astrophysics and Cosmic Phenomena
- Advanced Thermodynamic Systems and Engines
- Acoustic Wave Resonator Technologies
- Cosmology and Gravitation Theories
- GaN-based semiconductor devices and materials
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Dark Matter and Cosmic Phenomena
- Advanced Semiconductor Detectors and Materials
- Semiconductor Quantum Structures and Devices
- Adaptive optics and wavefront sensing
- Stellar, planetary, and galactic studies
- Advanced optical system design
- Semiconductor Lasers and Optical Devices
- Galaxies: Formation, Evolution, Phenomena
- Satellite Communication Systems
- Advanced Vision and Imaging
- 3D IC and TSV technologies
- Astronomical Observations and Instrumentation
- Spacecraft Dynamics and Control
Cornell University
2024-2025
University of Massachusetts Amherst
2024
University of Colorado Boulder
2018-2022
National Institute of Standards and Technology
2018-2022
Sensors (United States)
2019-2021
Laboratory for Atmospheric and Space Physics
2018-2020
University of Colorado System
2018
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...
<strong>Publisher's Note</strong>: This paper, originally published on 22 December 2020, was replaced with a corrected/revised version 12 March 2021. If you downloaded the original PDF but are unable to access revision, please contact SPIE Digital Library Customer Service for assistance. AliCPT-1 is first CMB degree scale polarimeter be deployed Tibetan plateau at 5,250m asl. 95/150GHz 72cm aperture, two lens refracting telescope cooled down 4K. Alumina lenses image 636mm wide focal plane....
CCAT-prime will be a 6-meter aperture telescope operating from sub-mm to mm wavelengths, located at 5600 meters elevation on Cerro Chajnantor in the Atacama Desert Chile. Its novel crossed-Dragone optical design deliver high throughput, wide field of view capable illuminating much larger arrays and detectors than can existing telescopes. We present an overview motivation Prime-Cam, first-light instrument for CCAT-prime. Prime-Cam house seven modules 1.8 meter diameter cryostat, cooled by...
The CCAT Collaboration's six-meter Fred Young Submillimeter Telescope is scheduled to begin observing in the Chilean Atacama 2025, targeting a variety of science goals throughout cosmic history. Prime-Cam 1.8-meter diameter cryostat that will host up seven independent instrument modules designed for simultaneous spectroscopic and broadband, polarimetric surveys at millimeter submillimeter wavelengths. first these modules, 280 GHz module, include ${\sim}$10,000 kinetic inductance detectors...
The Cerro Chajnantor Atacama Telescope-prime (CCAT-prime) is a new 6-m, off-axis, low-emissivity, large field-of-view submillimeter telescope scheduled for first light in the last quarter of 2021. In summary, (a) CCAT-prime uniquely combines (up to 8-deg), low emissivity (< 2%) and excellent atmospheric transmission (5600-m site) achieve unprecedented survey capability submillimeter. (b) Over five years, generation science will address physics star formation, galaxy evolution, cluster...
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...
Prime-Cam, a first-generation science instrument for the Atacama-based Fred Young Submillimeter Telescope, is being built by CCAT Collaboration to observe at millimeter and submillimeter wavelengths using kinetic inductance detectors (KIDs). Prime-Cam's 280 GHz module will deploy with two aluminum-based KID arrays one titanium nitride-based array, totaling approximately 10,000 focal plane, all of which have been fabricated are currently undergoing testing. One complication fielding large...
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) 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...
Ali CMB Polarization Telescope (AliCPT) is the first Cosmic Microwave Background (CMB) polarimeter with a large focal plane camera to be deployed in Northern Hemisphere, Tibetan Plateau. Here we present design of dichroic (90/150 GHz) capable hosting up 32,376 Transition-Edge Sensor (TES) bolometers operating from base temperature 280 mK. Detectors are fabricated as monolithic arrays 1,704 feedhorn-coupled and polarization-sensitive TES that packaged independent modules read out microwave...
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 outline the development of readout software for Prime-Cam and Mod-Cam instruments on CCAT Fred Young Submillimeter Telescope (FYST), primecam_readout. The feature lumped-element kinetic inductance detector (LEKID) arrays driven by Xilinx ZCU111 RFSoC boards. In current configuration, each board can drive up to 4000 KIDs, is implementing approximately 25 runs a centralized control computer connected boards via dedicated ethernet, facilitates such tasks as frequency-multiplexed tone comb...
The Fred Young Submillimeter Telescope (FYST), on Cerro Chajnantor in the Atacama desert of Chile, will conduct wide-field and small deep-field surveys sky with more than 100,000 detectors Prime-Cam instrument. Kinetic inductance (KIDs) were chosen as primary sensor technology for their high density focal plane packing. Additionally, they benefit from low cost, ease fabrication, simplified cryogenic readout, which are all beneficial successful deployment at scale. multiplexing complexity is...
Prime-Cam is a first-generation science instrument for the CCAT Observatory's six-meter aperture Fred Young Submillimeter Telescope (FYST). FYST's crossed-Dragone design provides high optical throughput to take advantage of its unique site at 5600 m on Cerro Chajnantor in Chile's Atacama Desert reach mapping speeds over ten times greater than current and near-term submillimeter experiments. Housing up seven independent modules 1.8-meter diameter cryostat, will combine broadband...