Richard A. Lew
A5053032719- Superconducting and THz Device Technology
- Radio Astronomy Observations and Technology
- Microwave Engineering and Waveguides
- Physics of Superconductivity and Magnetism
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Advancements in PLL and VCO Technologies
- Analog and Mixed-Signal Circuit Design
- Astronomy and Astrophysical Research
- Soil Moisture and Remote Sensing
- Thermal Radiation and Cooling Technologies
- Semiconductor materials and devices
Theiss Research
2023-2025
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...
Time-division multiplexing (TDM) of transition-edge-sensor (TES) microcalorimeters is being developed as the readout technology for Athena X-ray integral field unit (X-IFU) and CMB-S4. We present an experimental demonstration our latest TDM architecture, which has been implemented in a 4-column × 34-row chip that fully compatible with X-IFU design specifications. This new "mux21" architecture designed differential uses two-layer switches to reduce number row-address lines while also...
Abstract The Simons Observatory is a cosmic microwave background experiment stationed atop Cerro Toco, at an elevation of 5200 ms in Chile’s Atacama Desert. receivers the will contain more than 60,000 transition edge sensor bolometers. In order to read out this large detector count scalable manner, we utilize superconducting quantum interference device (SQUID) multiplexing scheme where each inductively coupled rf SQUID, which turn GHz resonator. More 2000 SQUIDs and resonators are fabricated...
Abstract Time division SQUID multiplexing is being developed as the TES readout technology for ATHENA X-ray integral field unit and CMB-S4. Close packing of TDM dc-biased components motivated by chip area constraints but has resulted in significant physical neighbor crosstalk previous generation chips. We present techniques to reduce both linear two dimensional (2D) chips well measurements these
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...
Increasingly large arrays TES bolometers continue to be planned for future mm-wave observatories, but their scalability is limited by the associated cryogenic multiplexing readout. Microwave SQUID a natural candidate systems, as it already boasts ~10x channel handling advantage over other readout schemes due its available bandwidth. By further doubling this bandwidth, demonstration we present increases factor from prior best of 910 1,820 and enables simple 1:1 pairing detector components...
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...