6 results on '"M. Silva-Feaver"'
Search Results
2. Bandwidth and Aliasing in the Microwave SQUID Multiplexer
- Author
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C. Yu, Z. Ahmed, J. A. Connors, J. M. D’Ewart, B. Dober, J. C. Frisch, S. W. Henderson, G. C. Hilton, J. Hubmayr, S. E. Kuenstner, J. A. B. Mates, M. Silva-Feaver, J. N. Ullom, L. R. Vale, D. Van Winkle, and E. Young
- Subjects
Physics - Instrumentation and Detectors ,FOS: Physical sciences ,General Materials Science ,Instrumentation and Detectors (physics.ins-det) ,Astrophysics - Instrumentation and Methods for Astrophysics ,Condensed Matter Physics ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Atomic and Molecular Physics, and Optics - Abstract
The microwave SQUID multiplexer (umux) has enabled higher bandwidth or higher channel counts across a wide range of experiments in particle physics, astronomy, and spectroscopy. The large multiplexing factor coupled with recent commercial availability of microwave components and warm electronics readout systems make it an attractive candidate for systems requiring large cryogenic detector counts. Since the multiplexer is considered for both bolometric and calorimetric applications across several orders of magnitude of signal frequencies, understanding the bandwidth of the device and its interaction with readout electronics is key to appropriately designing and engineering systems. Here we discuss several important factors contributing to the bandwidth properties of umux systems, including the intrinsic device bandwidth, interactions with warm electronics readout systems, and aliasing. We present simulations and measurements of umux devices coupled with SLAC Microresonator RF (SMuRF) tone-tracking electronics and discuss several implications for future experimental design., Comment: Proceedings for Low Temperature Physics 2021, accepted for publication in Journal of Low Temperature Physics. 8 pages (including references), 5 figures
- Published
- 2022
3. The Simons Observatory: A fully remote controlled calibration system with a sparse wire grid for cosmic microwave background telescopes.
- Author
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Murata M, Nakata H, Iijima K, Adachi S, Seino Y, Kiuchi K, Matsuda F, Randall MJ, Arnold K, Galitzki N, Johnson BR, Keating B, Kusaka A, Lloyd JB, Seibert J, Silva-Feaver M, Tajima O, Terasaki T, and Yamada K
- Abstract
For cosmic microwave background (CMB) polarization observations, calibration of detector polarization angles is essential. We have developed a fully remote controlled calibration system with a sparse wire grid that reflects linearly polarized light along the wire direction. The new feature is a remote-controlled system for regular calibration, which has not been possible in sparse wire grid calibrators in past experiments. The remote control can be achieved by two electric linear actuators that load or unload the sparse wire grid into a position centered on the optical axis of a telescope between the calibration time and CMB observation. Furthermore, the sparse wire grid can be rotated by using a motor. A rotary encoder and a gravity sensor are installed on the sparse wire grid to monitor the wire direction. They allow us to achieve detector polarization angle calibration with an expected systematic error of 0.08°. The calibration system will be installed in small-aperture telescopes at Simons Observatory., (© 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).)
- Published
- 2023
- Full Text
- View/download PDF
4. SLAC microresonator RF (SMuRF) electronics: A tone-tracking readout system for superconducting microwave resonator arrays.
- Author
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Yu C, Ahmed Z, Frisch JC, Henderson SW, Silva-Feaver M, Arnold K, Brown D, Connors J, Cukierman AJ, D'Ewart JM, Dober BJ, Dusatko JE, Haller G, Herbst R, Hilton GC, Hubmayr J, Irwin KD, Kuo CL, Mates JAB, Ruckman L, Ullom J, Vale L, Van Winkle DD, Vasquez J, and Young E
- Abstract
We describe the newest generation of the SLAC Microresonator RF (SMuRF) electronics, a warm digital control and readout system for microwave-frequency resonator-based cryogenic detector and multiplexer systems, such as microwave superconducting quantum interference device multiplexers (μmux) or microwave kinetic inductance detectors. Ultra-sensitive measurements in particle physics and astronomy increasingly rely on large arrays of cryogenic sensors, which in turn necessitate highly multiplexed readout and accompanying room-temperature electronics. Microwave-frequency resonators are a popular tool for cryogenic multiplexing, with the potential to multiplex thousands of detector channels on one readout line. The SMuRF system provides the capability for reading out up to 3328 channels across a 4-8 GHz bandwidth. Notably, the SMuRF system is unique in its implementation of a closed-loop tone-tracking algorithm that minimizes RF power transmitted to the cold amplifier, substantially relaxing system linearity requirements and effective noise from intermodulation products. Here, we present a description of the hardware, firmware, and software systems of the SMuRF electronics, comparing achieved performance with science-driven design requirements. In particular, we focus on the case of large-channel-count, low-bandwidth applications, but the system has been easily reconfigured for high-bandwidth applications. The system described here has been successfully deployed in lab settings and field sites around the world and is baselined for use on upcoming large-scale observatories.
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- 2023
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5. Simons Observatory: characterizing the Large Aperture Telescope Receiver with radio holography.
- Author
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Chesmore GE, Harrington K, Sierra CE, Gallardo PA, Sutariya S, Alford T, Adler AE, Bhandarkar T, Coppi G, Dachlythra N, Golec J, Gudmundsson J, Haridas SK, Johnson BR, Kofman AM, Iuliano J, McMahon J, Niemack MD, Orlowski-Scherer J, Perez Sarmiento K, Puddu R, Silva-Feaver M, Simon SM, Robe J, Wollack EJ, and Xu Z
- Abstract
We present near-field radio holography measurements of the Simons Observatory Large Aperture Telescope Receiver optics. These measurements demonstrate that radio holography of complex millimeter-wave optical systems comprising cryogenic lenses, filters, and feed horns can provide detailed characterization of wave propagation before deployment. We used the measured amplitude and phase, at 4 K, of the receiver near-field beam pattern to predict two key performance parameters: 1) the amount of scattered light that will spill past the telescope to 300 K and 2) the beam pattern expected from the receiver when fielded on the telescope. These cryogenic measurements informed the removal of a filter, which led to improved optical efficiency and reduced sidelobes at the exit of the receiver. Holography measurements of this system suggest that the spilled power past the telescope mirrors will be less than 1%, and the main beam with its near sidelobes are consistent with the nominal telescope design. This is the first time such parameters have been confirmed in the lab prior to deployment of a new receiver. This approach is broadly applicable to millimeter and submillimeter instruments.
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- 2022
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6. Internal Delensing of Cosmic Microwave Background Polarization B-Modes with the POLARBEAR Experiment.
- Author
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Adachi S, Aguilar Faúndez MAO, Akiba Y, Ali A, Arnold K, Baccigalupi C, Barron D, Beck D, Bianchini F, Borrill J, Carron J, Cheung K, Chinone Y, Crowley K, El Bouhargani H, Elleflot T, Errard J, Fabbian G, Feng C, Fujino T, Goeckner-Wald N, Hasegawa M, Hazumi M, Hill CA, Howe L, Katayama N, Keating B, Kikuchi S, Kusaka A, Lee AT, Leon D, Linder E, Lowry LN, Matsuda F, Matsumura T, Minami Y, Namikawa T, Navaroli M, Nishino H, Peloton J, Pham ATP, Poletti D, Puglisi G, Reichardt CL, Segawa Y, Sherwin BD, Silva-Feaver M, Siritanasak P, Stompor R, Tajima O, Takatori S, Tanabe D, Teply GP, and Vergès C
- Abstract
Using only cosmic microwave background polarization data from the polarbear experiment, we measure B-mode polarization delensing on subdegree scales at more than 5σ significance. We achieve a 14% B-mode power variance reduction, the highest to date for internal delensing, and improve this result to 22% by applying for the first time an iterative maximum a posteriori delensing method. Our analysis demonstrates the capability of internal delensing as a means of improving constraints on inflationary models, paving the way for the optimal analysis of next-generation primordial B-mode experiments.
- Published
- 2020
- Full Text
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