Anna M. Kofman
A5005813675- Superconducting and THz Device Technology
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Antenna Design and Optimization
- Galaxies: Formation, Evolution, Phenomena
- Physics of Superconductivity and Magnetism
- Dark Matter and Cosmic Phenomena
- Soil Moisture and Remote Sensing
- Satellite Communication Systems
- Radio Frequency Integrated Circuit Design
- Microwave Engineering and Waveguides
- Spacecraft and Cryogenic Technologies
- Advanced Thermodynamic Systems and Engines
- Geophysics and Gravity Measurements
- Particle physics theoretical and experimental studies
- Planetary Science and Exploration
- Astro and Planetary Science
- Scientific Research and Discoveries
- Neutrino Physics Research
- Gamma-ray bursts and supernovae
- Advanced MIMO Systems Optimization
- Radio, Podcasts, and Digital Media
California University of Pennsylvania
2020-2024
University of Pennsylvania
2019-2023
University of Illinois Urbana-Champaign
2018-2022
Philadelphia University
2019
Argonne National Laboratory
2018
University of California, Berkeley
2018
Urbana University
2018
Kavli Institute for Particle Astrophysics and Cosmology
2018
Stanford University
2018
Fermi National Accelerator Laboratory
2018
We present measurements of the $E$-mode ($EE$) polarization power spectrum and temperature-$E$-mode ($TE$) cross-power cosmic microwave background using data collected by SPT-3G, latest instrument installed on South Pole Telescope. This analysis uses observations a $1500\text{ }\text{ }{\mathrm{deg}}^{2}$ region at 95, 150, 220 GHz taken over four-month period in 2018. report binned values $EE$ $TE$ spectra angular multipole range $300\ensuremath{\le}\ensuremath{\ell}<3000$, multifrequency...
SPT-3G is the third survey receiver operating on South Pole Telescope dedicated to high-resolution observations of cosmic microwave background (CMB). Sensitive measurements temperature and polarization anisotropies CMB provide a powerful dataset for constraining cosmology. Additionally, surveys with arcminute-scale resolution are capable detecting galaxy clusters, millimeter-wave bright galaxies, variety transient phenomena. The instrument provides significant improvement in mapping speed...
We present a measurement of gravitational lensing over 1500 deg2 the Southern sky using SPT-3G temperature data at 95 GHz and 150 taken in 2018. The amplitude relative to fiducial Planck 2018 Lambda cold dark matter (ΛCDM) cosmology is found be 1.020±0.060, excluding instrumental astrophysical systematic uncertainties. conduct extensive null tests check robustness measurements, report minimum-variance combined power spectrum angular multipoles 50<L<2000, which we use constrain cosmological...
The South Pole Telescope (SPT) is a millimeter-wavelength telescope designed for high-precision measurements of the cosmic microwave background (CMB). SPT measures both temperature and polarization CMB with large aperture, resulting in high resolution maps sensitive to signals across wide range angular scales on sky. With these data, has potential make broad cosmological measurements. These include constraining effect massive neutrinos large-scale structure formation as well cleaning...
Abstract The Simons Observatory (SO) is a cosmic microwave background survey experiment that includes small-aperture telescopes (SATs) observing from an altitude of 5200 m in the Atacama Desert Chile. SO SATs will cover six spectral bands between 27 and 280 GHz to search for primordial B-modes sensitivity σ ( r ) = 0.002, with quantified systematic errors well below this value. Each SAT self-contained cryogenic telescope 35° field view, 42 cm diameter optical aperture, 40 K half-wave plate,...
Abstract The Simons Observatory will map the temperature and polarization over half of sky at millimeter wavelengths in six spectral bands from Atacama Desert Chile. These data provide new insights into genesis, content, history our Universe, astrophysics galaxies galaxy clusters, objects solar system, time-varying astrophysical phenomena. This ambitious instrument suite, initially comprising three 0.5 m diameter small aperture telescopes one 6 large telescope, is designed using a common...
The Simons Observatory (SO) is a ground-based cosmic microwave background (CMB) survey experiment that currently consists of three 0.42m small-aperture telescopes (SATs) and one 6m large-aperture telescope (LAT), located at an elevation 5200m in the Atacama Desert Chile. At LAT's focal plane, SO will install >62,000 transition-edge sensor detectors across 13 optics tubes (OTs) within Large Aperture Telescope Receiver (LATR), largest cryogenic camera ever built to observe CMB. Here we report...
The third-generation South Pole Telescope camera (SPT-3G) improves upon its predecessor (SPTpol) by an order of magnitude increase in detectors on the focal plane. technology used to read out and control these detectors, digital frequency-domain multiplexing (DfMUX), is conceptually same as for SPTpol, but extended accommodate more detectors. A nearly 5× expansion readout operating bandwidth has enabled use this large plane, SPT-3G performance meets forecasting targets relevant science...
Abstract High angular resolution cosmic microwave background experiments provide a unique opportunity to conduct survey of time-variable sources at millimeter wavelengths, population that has primarily been understood through follow-up measurements detections in other bands. Here we report the first results an astronomical transient with South Pole Telescope (SPT) using SPT-3G camera observe 1500 deg 2 southern sky. The observations took place from 2020 March November three bands centered...
Abstract We present the first measurements of asteroids in millimeter wavelength data from South Pole Telescope (SPT), which is used primarily to study cosmic microwave background (CMB). analyze maps two ∼270 deg 2 sky regions near ecliptic plane, each observed with SPTpol camera ∼100 times over 1 month. subtract mean all a given field, removing static signal, and then average mean-subtracted at known asteroid locations. detect three asteroids—(324) Bamberga, (13) Egeria, (22) Kalliope—with...
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 will map the temperature and polarization over half of sky, at millimeter wavelengths in six spectral bands from Atacama Desert Chile. These data provide new insights into genesis, content, history our Universe; astrophysics galaxies galaxy clusters; objects solar system; time-varying astrophysical phenomena. This ambitious instrument suite, initially comprising three 0.5 m small-aperture telescopes one 6 large aperture telescope, is designed using a common combination...
The SPT-3G receiver was commissioned in early 2017 on the 10-meter South Pole Telescope (SPT) to map anisotropies cosmic microwave background (CMB). New optics, detector, and readout technologies have yielded a multichroic, high-resolution, low-noise camera with impressive throughput sensitivity, offering potential improve our understanding of inflationary physics, astroparticle growth structure. We highlight several key features design principles new receiver, summarize its performance date.
The desire for higher sensitivity has driven ground-based cosmic microwave background (CMB) experiments to employ ever larger focal planes, which in turn require reimaging optics. Practical limits the maximum size of these optics motivates development quasi-optically-coupled (lenslet-coupled), multi-chroic detectors. These detectors can be sensitive across a broader bandwidth compared waveguide-coupled However, increase comes at cost: lenses (up $\sim$700 mm diameter) and lenslets ($\sim$5...
Focal plane arrays consisting of low-noise, polarisation-sensitive detectors have made possible the pioneering advances in study cosmic microwave background (CMB). To make further progress, next generation CMB experiments (e.g. CMB-S4) will require a substantial increase number compared to current stage 3 instruments. Arrays kinetic inductance (KIDs) provide path realising such large format owing their intrinsic multiplexing advantage and relative cryogenic simplicity. In this proceedings,...
We present two prescriptions for broadband ($ {\sim} 77 - 252\;{\rm GHz} $), millimeter-wave antireflection coatings cryogenic, sintered polycrystalline aluminum oxide optics: one large-format (700 mm diameter) planar and plano-convex elements, the other densely packed arrays of quasi-optical elements-in our case, 5 diameter half-spheres (called "lenslets"). The comprise three layers commercially available, polytetrafluoroethylene-based, dielectric sheet material. lenslet coating is molded...
We present geometrical and physical optics simulation results for the Simons Observatory Large Aperture Telescope. This work was developed as part of general design process telescope; allowing us to evaluate impact various choices on performance metrics potential systematic effects. The primary goal simulations final reflectors cold which are now being built. describe non-sequential ray tracing used inform optics, including absorbers internal each tube. discuss telescope structure that allow...