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14 results on '"Lew, Richard"'

1. Simons Observatory: Pre-deployment Performance of a Large Aperture Telescope Optics Tube in the 90 and 150 GHz Spectral Bands

Author

Sierra, Carlos E., Harrington, Kathleen, Sutariya, Shreya, Alford, Thomas, Kofman, Anna M., Chesmore, Grace E., Austermann, Jason E., Bazarko, Andrew, Beall, James A., Bhandarkar, Tanay, Devlin, Mark J., Dicker, Simon R., Dow, Peter N., Duff, Shannon M., Dutcher, Daniel, Galitzki, Nicholas, Golec, Joseph E., Groh, John C., Gudmundsson, Jon E., Haridas, Saianeesh K., Healy, Erin, Hubmayr, Johannes, Iuliano, Jeffrey, Johnson, Bradley R., Lessler, Claire S., Lew, Richard A., Link, Michael J., Lucas, Tammy J., McMahon, Jeffrey J., Moore, Jenna E., Nati, Federico, Niemack, Michael D., Schmitt, Benjamin L., Silva-Feaver, Max, Singh, Robinjeet, Sonka, Rita F., Thomas, Alex, Thornton, Robert J., Tsan, Tran, Ullom, Joel N., Van Lanen, Jeffrey L., Vavagiakis, Eve M., Vissers, Michael R., Wang, Yuhan, and Zheng, Kaiwen

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The Simons Observatory will map the temperature and polarization over half of the sky, at millimeter wavelengths in six spectral bands from the Atacama Desert in Chile. These data will provide new insights into the genesis, content, and history of our Universe; the astrophysics of galaxies and galaxy clusters; objects in our solar system; and time-varying astrophysical phenomena. This ambitious new instrument suite, initially comprising three 0.5 m small-aperture telescopes and one 6 m large aperture telescope, is designed using a common combination of new technologies and new implementations to realize an observatory significantly more capable than the previous generation. In this paper, we present the pre-deployment performance of the first mid-frequency "optics tube" which will be fielded on the large aperture telescope with sensitivity to the 90 and 150 GHz spectral bands. This optics tube contains lenses, filters, detectors, and readout components, all of which operate at cryogenic temperatures. It is one of seven that form the core of the large aperture telescope receiver in its initial deployment. We describe this optics tube, including details of comprehensive testing methods, new techniques for beam and passband characterization, and its measured performance. The performance metrics include beams, optical efficiency, passbands, and forecasts for the on-sky performance of the system. We forecast a sensitivity that exceeds the requirements of the large aperture telescope with greater than 30% margin in each spectral band, and predict that the instrument will realize diffraction-limited performance and the expected detector passbands.

Published
2024

2. The Simons Observatory: Design, integration, and testing of the small aperture telescopes

Author

Galitzki, Nicholas, Tsan, Tran, Spisak, Jake, Randall, Michael, Silva-Feaver, Max, Seibert, Joseph, Lashner, Jacob, Adachi, Shunsuke, Adkins, Sean M., Alford, Thomas, Arnold, Kam, Ashton, Peter C., Austermann, Jason E., Baccigalupi, Carlo, Bazarko, Andrew, Beall, James A., Bhimani, Sanah, Bixler, Bryce, Coppi, Gabriele, Corbett, Lance, Crowley, Kevin D., Crowley, Kevin T., Day-Weiss, Samuel, Dicker, Simon, Dow, Peter N., Duell, Cody J., Duff, Shannon M., Gerras, Remington G., Groh, John C., Gudmundsson, Jon E., Harrington, Kathleen, Hasegawa, Masaya, Healy, Erin, Henderson, Shawn W., Hubmayr, Johannes, Iuliano, Jeffrey, Johnson, Bradley R., Keating, Brian, Keller, Ben, Kiuchi, Kenji, Kofman, Anna M., Koopman, Brian J., Kusaka, Akito, Lee, Adrian T., Lew, Richard A., Lin, Lawrence T., Link, Michael J, Lucas, Tammy J., Lungu, Marius, Mangu, Aashrita, McMahon, Jeffrey J, Miller, Amber D., Moore, Jenna E., Morshed, Magdy, Nakata, Hironobu, Nati, Federico, Newburgh, Laura B., Nguyen, David V., Niemack, Michael D., Page, Lyman A., Sakaguri, Kana, Sakurai, Yuki, Rao, Mayuri Sathyanarayana, Saunders, Lauren J., Shroyer, Jordan E., Sugiyama, Junna, Tajima, Osamu, Takeuchi, Atsuto, Bua, Refilwe Tanah, Teply, Grant, Terasaki, Tomoki, Ullom, Joel N., Van Lanen, Jeffrey L., Vavagiakis, Eve M., Vissers, Michael R, Walters, Liam, Wang, Yuhan, Xu, Zhilei, Yamada, Kyohei, and Zheng, Kaiwen

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

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 in Chile. The SO SATs will cover six spectral bands between 27 and 280 GHz to search for primordial B-modes to a sensitivity of $\sigma(r)=0.002$, with quantified systematic errors well below this value. Each SAT is a self-contained cryogenic telescope with a 35$^\circ$ field of view, 42 cm diameter optical aperture, 40 K half-wave plate, 1 K refractive optics, and $<0.1$ K focal plane that holds $>12,000$ TES detectors. We describe the nominal design of the SATs and present details about the integration and testing for one operating at 93 and 145 GHz.

Published
2024

3. Qualification of Microwave SQUID Multiplexer Chips for Simons Observatory

Author

Jones, Dante, Singh, Robinjeet, Austermann, Jason, Beall, J. A., Daniel, David, Duff, Shannon M., Dutcher, Daniel, Groh, John, Hubmayr, Johannes, Johnson, Bradley R., Lew, Richard, Link, Michael J., Lucas, Tammy J., Mates, John A. B., Staggs, Suzanne, Ullom, Joel, Vale, Leila, Van Lanen, Jeffery, Vissers, Michael, and Wang, Yuhan

Published
2024
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5. Symmetric time-division-multiplexed SQUID readout with two-layer switches for future TES observatories

Author

Durkin, Malcolm, primary, Backhaus, Scott, additional, Bandler, Simon R., additional, Chervenak, James A., additional, Denison, Ed V., additional, Doriese, William B., additional, Gard, Johnathon D., additional, Hilton, Gene C., additional, Lew, Richard A., additional, Lucas, Tammy J., additional, Reintsema, Carl D., additional, Schmidt, Daniel R., additional, Smith, Stephen J., additional, Ullom, Joel N., additional, Vale, Leila R., additional, Vissers, Michael R., additional, and Wakeham, Nicholas A., additional

Published
2023
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7. Attorney General's Asian and Pacific Islander Advisory Committee, Final Report, 1988-12

Author

Minami, Dale, committee chair; Bulos, Alice, committee member; Camacho, Vincent S., committee member; Chan, Sandra, committee member; Der, Henry, committee member; Eng, Landy, committee member; Hooper, Palma, committee member; Ishii, Anthony, committee member; Kester, Judith Otamura, committee member; Khommarath, Bounhong, committee member; Kwong, Karen G., committee member; Lee, Martin, committee member; Lew, Richard, committee member; Lim, S. Deborah, committee member; Lindstrom, Carl A., Jr., committee member; Lui, Elwood, committee member; Morales, Royal, committee member; Nakagawa, Cressey, commitee member; Ochi, Rose Matsui, committee member; Ota, Henry Y., committee member; Panchal, Haresh N., committee member; Sananikone, Prany, committee member; Song, Arthur P., Jr., committee member; Thever, Shan, committee member; Vuong, Vu-Duc, committee member; Wakabayashi, Ron, committee member; Wasserman, Fumiko Hachiya, committee member; Yu, Diane C., committee member; Takei, Barbara, commitee consultant; Mercado, Marty, committee coordinator; Zodrow, Ida Tsujikawa, Office of the Attorney General, staff member; Higashi, Paula, Office of the Attorney General, staff member; Shimomura, Floyd, Office of the Attorney General, staff member; Lew, Alan, Office of the Attorney General, staff member;Hernandez, Dolores, secretary; Mitsuoka, Steve, student assistant and Minami, Dale, committee chair; Bulos, Alice, committee member; Camacho, Vincent S., committee member; Chan, Sandra, committee member; Der, Henry, committee member; Eng, Landy, committee member; Hooper, Palma, committee member; Ishii, Anthony, committee member; Kester, Judith Otamura, committee member; Khommarath, Bounhong, committee member; Kwong, Karen G., committee member; Lee, Martin, committee member; Lew, Richard, committee member; Lim, S. Deborah, committee member; Lindstrom, Carl A., Jr., committee member; Lui, Elwood, committee member; Morales, Royal, committee member; Nakagawa, Cressey, commitee member; Ochi, Rose Matsui, committee member; Ota, Henry Y., committee member; Panchal, Haresh N., committee member; Sananikone, Prany, committee member; Song, Arthur P., Jr., committee member; Thever, Shan, committee member; Vuong, Vu-Duc, committee member; Wakabayashi, Ron, committee member; Wasserman, Fumiko Hachiya, committee member; Yu, Diane C., committee member; Takei, Barbara, commitee consultant; Mercado, Marty, committee coordinator; Zodrow, Ida Tsujikawa, Office of the Attorney General, staff member; Higashi, Paula, Office of the Attorney General, staff member; Shimomura, Floyd, Office of the Attorney General, staff member; Lew, Alan, Office of the Attorney General, staff member;Hernandez, Dolores, secretary; Mitsuoka, Steve, student assistant

Abstract

Attorney General's Asian and Pacific Islander Advisory Committee, Office of the Attorney General, Community and Consumer Affairs Office, 1515 K Street, Sacramento, California, USA, Final report, 1988 December.

Published
2019

9. The removal of cobalt from zinc sulphate electrolytes using the copper-antimoney process

Author

Lew, Richard W.

Abstract

At Cominco's zinc refinery located at Trail, British Columbia, impurities are removed from zinc sulphate electrolyte by a two stage purification process using zinc dust. Copper, cadmium and thallium are removed in the first stage whereas cobalt is removed in the second stage. Cobalt removal kinetics are affected by soluble antimony and copper additions to the electrolyte. This study was focused on the kinetics of cobalt removal by zinc powder cementation. Experimental variables included copper and antimony concentrations, pH and temperature. Common organic additives employed in zinc plants were studied to determine potential interactions with the cobalt removal process. Cementation products obtained from laboratory experiments and plant practice were studied using the SEM. A number of significant findings were observed. 1) Cobalt removal was extremely slow in the absence of any activators in solution. Batch testing have shown that antimony activation performed better than copper activation, but the addition of both copper and antimony together increased the rate of cobalt removal significantly. Copper and antimony ions were essentially removed from solution during the early stages of the cementation reaction (within the first 15 minutes), presumably, establishing the cathode surface for cobalt removal. 2) The cobalt removal rate constant increased with increasing temperature, and the highest rate was obtained at 90°C (the highest temperature tested). An apparent energy of activation of 86.6 kJ/mol was calculated for this system, and this value was consistent with activation controlled processes. 3) pH significantly affected the cobalt cementation rate constant. Too low a pH (4.0) can result in passivation of the residue's surface. In both these extreme ranges, cobalt removal was detrimentally affected. 4) A drop in the cobalt removal rates can be correlated with a rise in the E^ of the slurry. Lignin sulphonate, Percol 351 and animal glue at levels of 2 mg/L significantly impede cobalt cementation. 5) SEM analyses of the cementation residues have shown that the activation agents and the cobalt impurity was collected onto an impurity shell surrounding the dissolving zinc particle. This shell consisted mainly of Zn and minor constituents of Co, Cu and Sb.

Published
1994
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13. Advancing Parallel Solution Phase Library Synthesis through Efficient Purification, Quantitation, and Characterization Techniques

Author

Noonan, Jeffrey, Brown, Joe, Kershaw, Mark, Lew, Richard, Lombardi, Christopher, Mach, Christopher, Shaw, Kenneth, Sogge, Scott, and Virdee, Susan

Abstract

Historically, access to large numbers of quality compounds in a parallel solution phase library synthesis environment has been hindered by the inability to rapidly purify, quantitate, and characterize solution phase libraries in an efficient and cost effective manner. At Neurogen Corporation, we overcome these barriers by employing a collection of novel workstations in the High Speed Synthesis (HSS) group that are tightly integrated into our informatics architecture. This approach supports rapid and reliable instrument operation, rapid interpretation of results, and decision analysis for further downstream tasks and processing. Our movement of library samples and data from workstation to workstation facilitates synthesis throughput and the utilization of equipment, creating a cost-effective library production environment.

Published
2003
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14. Advancing Parallel Solution Phase Library Synthesis through Efficient Purification, Quantitation, and Characterization Techniques

Author

Noonan, Jeffrey W., Brown, Joe N., Kershaw, Mark T., Lew, Richard M., Lombardi, Christopher J., Mach, Christopher J., Shaw, Kenneth R., Sogge, Scott R., and Virdee, Susan

Abstract

Historically, access to large numbers of quality compounds in a parallel solution phase library synthesis environment has been hindered by the inability to rapidly purify, quantitate, and characterize solution phase libraries in an efficient and cost effective manner. At Neurogen Corporation, we overcome these barriers by employing a collection of novel workstations in the High Speed Synthesis (HSS) group that are tightly integrated into our informatics architecture. This approach supports rapid and reliable instrument operation, rapid interpretation of results, and decision analysis for further downstream tasks and processing. Our movement of library samples and data from workstation to workstation facilitates synthesis throughput and the utilization of equipment, creating a cost-effective library production environment.

Published
2003
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