Carlos Sierra
A5069736471- Radio Astronomy Observations and Technology
- Superconducting and THz Device Technology
- Cosmology and Gravitation Theories
- Adaptive optics and wavefront sensing
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Dark Matter and Cosmic Phenomena
- Photocathodes and Microchannel Plates
- Plasma Diagnostics and Applications
- Graphene research and applications
- Carbon Nanotubes in Composites
- Electron and X-Ray Spectroscopy Techniques
- Spacecraft and Cryogenic Technologies
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Ion-surface interactions and analysis
- Gas Sensing Nanomaterials and Sensors
- Magnetic confinement fusion research
- Quantum Dots Synthesis And Properties
- Fusion materials and technologies
- Nanotechnology research and applications
- Nanopore and Nanochannel Transport Studies
- Advanced biosensing and bioanalysis techniques
University of Chicago
2020-2024
General Atomics (United States)
2024
University of Michigan–Ann Arbor
2006-2023
Michigan United
2018-2023
University of California, Berkeley
2020
Ann Arbor Center for Independent Living
2019
Cornell University
2018
Computational Physics (United States)
2018
Lawrence Berkeley National Laboratory
2017
Centro Tecnológico de Investigación, Desarrollo e Innovación en tecnologías de la Información y las Comunicaciones (TIC)
2013
In this article, the cornering stiffness estimation problem based on vehicle bicycle (one-track) model is studied. Both time-domain and frequency-domain-based methods are analyzed, aiming to estimate effective stiffness, defined as ratio between lateral force slip angle at two axles. Several were developed, each having specific pros/cons related practical implementations. The developed algorithms evaluated basis of simulation data from CarSimTM software. Finally, selected using experimental data.
The Simons Observatory (SO) will make precise temperature and polarization measurements of the cosmic microwave background (CMB) using a set telescopes which cover angular scales between 1 arcminute tens degrees, contain over 60,000 detectors, observe at frequencies 27 270 GHz. SO consist 6 m aperture telescope coupled to 30,000 transition-edge sensor bolometers along with three 42 cm refractive telescopes, an additional 30,000+ all be located in Atacama Desert altitude 5190 m. powerful...
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...
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 Simons Observatory (SO) is an upcoming experiment that will study temperature and polarization fluctuations in the cosmic microwave background (CMB) from Atacama Desert Chile. SO field both a large aperture telescope (LAT) array of small telescopes (SATs) observe six bands with center frequencies spanning 27 to 270~GHz. Key considerations during design phase are vast, including number cameras per telescope, focal plane magnification pixel density, in-band optical power camera throughput,...
A versatile remotely controlled fast reciprocating Langmuir probe has been developed for the TJ-II stellarator. The main components of system are a removable head, containing measurement tips, and displacement that enables to be displaced in vacuum. two different components: slow one (course length⩽0.8 m) set at initial position, (run length=0.1 obtain desired measurements within an adjustable time interval during plasma discharge. radial movement is by means programmable logical control...
We present an overview of the performance Neutralized Drift Compression Experiment-II (NDCX-II) accelerator at Berkeley Lab, and report on recent target experiments beam-driven melting transmission ion energy loss measurements with nanosecond millimeter-scale beam pulses thin tin foils. Bunches around 1011 ions, 1 mm radius, 2–30 ns full width half maximum duration have been created corresponding fluences in range 0.1–0.7 J/cm2. To achieve these short pulse durations mm-scale focal spot...
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...
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...
We present near-field radio holography measurements of the Simons Observatory Large Aperture Telescope Receiver optics. These demonstrate that complex millimeter-wave optical systems comprising cryogenic lenses, filters, and feed horns can provide detailed characterization wave propagation before deployment. used measured amplitude phase, at 4K, receiver beam pattern to predict two key performance parameters: 1) amount scattered light will spill past telescope 300K 2) expected from when...
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 temperature of a nonneutral plasma confined in Penning–Malmberg trap can be determined by slowly lowering one side the trap’s electrostatic axial confinement barrier; is inferred from rate at which particles escape as function barrier height. In many experiments, escaping are directed toward microchannel plate, and resulting amplified charge collected on phosphor screen. screen used for imaging but also Faraday cup (FC) measurement. sensitivity limit then set microphonic noise enhanced...
The Simons Observatory (SO) will be a CMB survey experiment with three small-aperture telescopes and one large-aperture telescope (the LAT), which observe from the Atacama Desert in Chile. In total, SO field over 60,000 TES bolometers six spectral bands centered between 27 280 GHz. 6 m LAT, targeting smaller angular scales of CMB, utilizes cryogenic receiver (LATR) designed to house up 13 individual optics tubes. scientific objectives project requires these tubes achieve high-throughput...
Deviations of the cosmic microwave background (CMB) energy spectrum from a perfect blackbody uniquely probe wide range physics, ranging fundamental physics in primordial Universe ($\mu$-distortion) to late-time baryonic feedback processes (y-distortion). While y-distortion can be detected with moderate increase sensitivity over that COBE/FIRAS, $\Lambda$CDM-predicted $\mu$-distortion is roughly two orders magnitude smaller and requires substantial improvements, foregrounds presenting serious...
The Simons Observatory (SO) is a cosmic microwave background experiment composed of three 0.42 m Small Aperture Telescopes (SATs) and one 6 Large Telescope (LAT) in the Atacama Desert Chile. Receiver (LATR) was integrated into LAT August 2023; however, because mirrors were not yet installed, LATR optical chain capped at 4K stage. In this dark configuration we are able to characterize many elements instrument without contributions from atmospheric noise. Here show noise below required upper...