A5051479055- Radio Astronomy Observations and Technology
- Superconducting and THz Device Technology
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Spacecraft and Cryogenic Technologies
- Pulsars and Gravitational Waves Research
- Astronomy and Astrophysical Research
- Advanced Thermodynamic Systems and Engines
- Advanced Frequency and Time Standards
- Advanced Thermodynamics and Statistical Mechanics
- Cryospheric studies and observations
- Precipitation Measurement and Analysis
- Adaptive optics and wavefront sensing
- Stellar, planetary, and galactic studies
- Calibration and Measurement Techniques
- Astronomical Observations and Instrumentation
University of California, San Diego
2020-2025
We present the requirements, design, and evaluation of cryogenic continuously rotating half-wave plate (CHWP) for Simons Observatory (SO). SO is a cosmic microwave background polarization experiment at Parque Astronómico de Atacama in northern Chile that covers wide range angular scales using both small (⌀0.42 m) large (⌀6 aperture telescopes. In particular, telescopes (SATs) focus on primordial B-mode polarization. To this end, SATs employ CHWP to modulate incident light 8 Hz, suppressing...
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...
We use time-domain simulations of Jupiter observations to test and develop a beam reconstruction pipeline for the Simons Observatory Small Aperture Telescopes. The method relies on map maker that estimates subtracts correlated atmospheric noise fitting code designed compensate bias caused by maker. our performance four different frequency bands against various algorithmic parameters, conditions input beams. additionally show quality as function number available investigate how calibration...
We present the requirements, design and evaluation of cryogenic continuously rotating half-wave plate (CHWP) for Simons Observatory (SO). SO is a cosmic microwave background (CMB) polarization experiment at Parque Astron\'{o}mico Atacama in northern Chile that covers wide range angular scales using both small (0.42 m) large (6 aperture telescopes. In particular, telescopes (SATs) focus on primordial B-mode polarization. To this end, SATs employ CHWP to modulate incident light 8~Hz,...
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...
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...
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...
The Simons Observatory (SO) is a cosmic microwave background (CMB) survey experiment located in the Atacama Desert Chile at an elevation of 5200 meters, nominally consisting array three 0.42-meter small aperture telescopes (SATs) and one 6-meter large telescope (LAT). SO will make accurate measurements CMB temperature polarization spanning six frequency bands ranging from 27 to 280 GHz, fielding total $\sim$68,000 detectors covering angular scales between arcminute tens degrees. In this...
Ground-based observatories across a wide range of wavelengths implement cryogenic cooling techniques to increase the sensitivity instruments and enable low temperature detector technologies. Commercial pulse tube cryocoolers (PTCs) are frequently used provide 40 K 4 stages as thermal shells in scientific instruments. However, PTC operation is dependent on gravity, giving rise changes capacity over operational tilt pointed telescopes. We present study performance two stage with 1.8 W at 4.2...
The Simons Observatory (SO) is a cosmic microwave background (CMB) survey experiment that includes small-aperture telescopes (SATs) observing from an altitude of 5,200 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 $\sigma(r)=0.002$, with quantified systematic errors well below this value. Each SAT self-contained cryogenic telescope 35$^\circ$ field view, 42 cm diameter optical aperture, 40 K half-wave...
Abstract POLARBEAR-2b (PB-2b) is the second receiver in Simons Array, a cosmic microwave background (CMB) polarization experiment. The Array uses dichroic sensitive lenslet-coupled sinuous antennas and transition-edge sensor (TES) bolometers made of superconducting films. These are read out with frequency multiplexing electronics. PB-2b contains $$\sim$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>∼</mml:mo> </mml:math> 7500 detectors two bands at 90 150 GHz arcminute...
We present the design and measured performance of a new carbon fiber strut that is used in cryogenically cooled truss for Simons Observatory small aperture telescope. The consists two aluminum 6061 rings separated by 24 struts. Each central tube fitted with end caps. tested (i) cycling destructively pull-testing samples, (ii) non-destructively final truss, (iii) measuring thermal conductivity tubes. found strength limited mounting fasteners caps, not epoxy adhesive or tube. This result...
Ground-based observatories across a wide range of wavelengths implement cryogenic cooling techniques to increase the sensitivity cameras and enable low temperature receiver technologies. Commercial pulse tube cryocoolers (PTCs) are frequently used provide 40 K 4 stages as thermal shells in cameras. However, PTC operation is dependent on gravity, giving rise changes capacity over operational tilt pointed telescopes. We present study performance designed 2.0 W at 4.2 55 45 (Cryomech PT420-RM)...