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18 results on '"D'Ewart, J. M."'

1. A Microwave SQUID Multiplexer Optimized for Bolometric Applications

Author

Dober, B., Ahmed, Z., Arnold, K., Becker, D. T., Bennett, D. A., Connors, J. A., Cukierman, A., D'Ewart, J. M., Duff, S. M., Dusatko, J. E., Frisch, J. C., Gard, J. D., Henderson, S. W., Herbst, R., Hilton, G. C., Hubmayr, J., Li, Y., Mates, J. A. B., McCarrick, H., Reintsema, C. D, Silva-Feaver, M., Ruckman, L., Ullom, J. N., Vale, L. R., Van Winkle, D. D., Vasquez, J., Wang, Y., Young, E., Yu, C., and Zheng, K.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

A microwave SQUID multiplexer ($\mu$MUX) has been optimized for coupling to large arrays of superconducting transition-edge sensor (TES) bolometers. We present the scalable cryogenic multiplexer chip design in a 1820-channel multiplexer configuration for the 4-8 GHz rf band. The key metrics of yield, sensitivity, and crosstalk are determined through measurements of 455 readout channels, which span 4-5 GHz. The median white-noise level is 45 pA/$\sqrt{\textrm{Hz}}$, evaluated at 2 Hz, with a 1/f knee $\leq$ 20 mHz after common-mode subtraction. The white-noise level decreases the sensitivity of a TES bolometer optimized for detection of the cosmic microwave background at 150 GHz by only 3%. The measured crosstalk between any channel pair is $\leq$ 0.3%., Comment: 6 pages, 5 figures

Published
2020
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2. ATCA LLRF System for ASU Compact FEL

Author

Young, A., Ewart, J. M. D, Frisch, J., Hong, B., Straumann, T., Weaver, M., and Xu, C.

Subjects
Physics - Accelerator Physics
Abstract

SLAC National Accelerator Laboratory is collaborating with Arizona State University to design a LLRF system towards the advancement of the ASU Compact X-ray Light Source (CXLS). The CXLS is a phased project to develop small brilliant x-ray sources that may produce coherent x-rays appropriate as a seed source for LCLS and LCLS II. The CXLS electron beam is produced by an x-band photoinjector and linac operating at 9.3 GHz RF frequency and 1 kHz repetition rate with up to 300 pC per bunch. The linac consists of 3 short 20-cell sections of standing wave linac. The RF gun and linac sections are powered by two 6 MW transmitters using L3 klystrons and Scandi-nova K1 modulators. The accelerator will initially operate in single-bunch mode and may be upgraded to multi-bunch operation at a later date. SLAC National Laboratory has developed a LLRF system in Advanced Telecommunication Computing Architecture (ATCA) for the ASU project. This talk will discuss the design of the LLRF for this project and discuss the ATCA implementation.

Published
2019

3. Magnetic Field Sensitivity of Microwave SQUID Multiplexers

Author

Connors, J. A., Ahmed, Z., Austermann, J., Denison, E. V., Dober, B., D’Ewart, J. M., Frisch, J. C., Henderson, S. W., Herbst, R., Hilton, G. C., Huber, Z. B., Hubmayr, J., Li, Y., Mates, J. A. B., Niemack, M., Vale, L. R., Van Winkle, D., Vavagiakis, E., Whipps, Z., Young, E., Yu, C., and Ullom, J.

Published
2022
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5. Demonstrating a Long-Coherence Dual-Rail Erasure Qubit Using Tunable Transmons

Author

Levine, H., primary, Haim, A., additional, Hung, J. S. C., additional, Alidoust, N., additional, Kalaee, M., additional, DeLorenzo, L., additional, Wollack, E. A., additional, Arrangoiz-Arriola, P., additional, Khalajhedayati, A., additional, Sanil, R., additional, Moradinejad, H., additional, Vaknin, Y., additional, Kubica, A., additional, Hover, D., additional, Aghaeimeibodi, S., additional, Alcid, J. A., additional, Baek, C., additional, Barnett, J., additional, Bawdekar, K., additional, Bienias, P., additional, Carson, H. A., additional, Chen, C., additional, Chen, L., additional, Chinkezian, H., additional, Chisholm, E. M., additional, Clifford, A., additional, Cosmic, R., additional, Crisosto, N., additional, Dalzell, A. M., additional, Davis, E., additional, D’Ewart, J. M., additional, Diez, S., additional, D’Souza, N., additional, Dumitrescu, P. T., additional, Elkhouly, E., additional, Fang, M. T., additional, Fang, Y., additional, Flammia, S., additional, Fling, M. J., additional, Garcia, G., additional, Gharzai, M. K., additional, Gorshkov, A. V., additional, Gray, M. J., additional, Grimberg, S., additional, Grimsmo, A. L., additional, Hann, C. T., additional, He, Y., additional, Heidel, S., additional, Howell, S., additional, Hunt, M., additional, Iverson, J., additional, Jarrige, I., additional, Jiang, L., additional, Jones, W. M., additional, Karabalin, R., additional, Karalekas, P. J., additional, Keller, A. J., additional, Lasi, D., additional, Lee, M., additional, Ly, V., additional, MacCabe, G., additional, Mahuli, N., additional, Marcaud, G., additional, Matheny, M. H., additional, McArdle, S., additional, McCabe, G., additional, Merton, G., additional, Miles, C., additional, Milsted, A., additional, Mishra, A., additional, Moncelsi, L., additional, Naghiloo, M., additional, Noh, K., additional, Oblepias, E., additional, Ortuno, G., additional, Owens, J. C., additional, Pagdilao, J., additional, Panduro, A., additional, Paquette, J.-P., additional, Patel, R. N., additional, Peairs, G., additional, Perello, D. J., additional, Peterson, E. C., additional, Ponte, S., additional, Putterman, H., additional, Refael, G., additional, Reinhold, P., additional, Resnick, R., additional, Reyna, O. A., additional, Rodriguez, R., additional, Rose, J., additional, Rubin, A. H., additional, Runyan, M., additional, Ryan, C. A., additional, Sahmoud, A., additional, Scaffidi, T., additional, Shah, B., additional, Siavoshi, S., additional, Sivarajah, P., additional, Skogland, T., additional, Su, C.-J., additional, Swenson, L. J., additional, Sylvia, J., additional, Teo, S. M., additional, Tomada, A., additional, Torlai, G., additional, Wistrom, M., additional, Zhang, K., additional, Zuk, I., additional, Clerk, A. A., additional, Brandão, F. G. S. L., additional, Retzker, A., additional, and Painter, O., additional

Published
2024
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6. Microwave Multiplexing on the Keck Array

Author

Cukierman, A., Ahmed, Z., Henderson, S., Young, E., Yu, C., Barkats, D., Brown, D., Chaudhuri, S., Cornelison, J., D’Ewart, J. M., Dierickx, M., Dober, B. J., Dusatko, J., Fatigoni, S., Filippini, J. P., Frisch, J. C., Haller, G., Halpern, M., Hilton, G. C., Hubmayr, J., Irwin, K. D., Karkare, K. S., Karpel, E., Kernasovskiy, S. A., Kovac, J. M., Kovacs, A., Kuenstner, S. E., Kuo, C. L., Li, D., Mates, J. A. B., Smith, S., St. Germaine, T., Ullom, J. N., Vale, L. R., Van Winkle, D. D., Vasquez, J., Willmert, J., Zeng, L., Ade, P. A. R., Amiri, M., Basu Thakur, R., Bischoff, C. A., Bock, J. J., Boenish, H., Bullock, E., Buza, V., Cheshire, J., Connors, J., Crumrine, M., Duband, L., Hall, G., Harrison, S., Hildebrandt, S. R., Hui, H., Kang, J., Kefeli, S., Lau, K., Megerian, K. G., Moncelsi, L., Namikawa, T., Nguyen, H. T., O’Brient, R., Palladino, S., Pryke, C., Racine, B., Reintsema, C. D., Richter, S., Schillaci, A., Schwarz, R., Sheehy, C. D., Soliman, A., Steinbach, B., Sudiwala, R. V., Thompson, K. L., Tucker, C., Turner, A. D., Umiltà, C., Vieregg, A. G., Wandui, A., Weber, A. C., Wiebe, D. V., Wu, W. L. K., Yang, H., Yoon, K. W., and Zhang, C.

Published
2020
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7. A microwave SQUID multiplexer optimized for bolometric applications

Author

Dober, B., primary, Ahmed, Z., additional, Arnold, K., additional, Becker, D. T., additional, Bennett, D. A., additional, Connors, J. A., additional, Cukierman, A., additional, D'Ewart, J. M., additional, Duff, S. M., additional, Dusatko, J. E., additional, Frisch, J. C., additional, Gard, J. D., additional, Henderson, S. W., additional, Herbst, R., additional, Hilton, G. C., additional, Hubmayr, J., additional, Li, Y., additional, Mates, J. A. B., additional, McCarrick, H., additional, Reintsema, C. D., additional, Silva-Feaver, M., additional, Ruckman, L., additional, Ullom, J. N., additional, Vale, L. R., additional, Van Winkle, D. D., additional, Vasquez, J., additional, Wang, Y., additional, Young, E., additional, Yu, C., additional, and Zheng, K., additional

Published
2021
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9. Microwave Multiplexing on the Keck Array

Author

Cukierman, A., primary, Ahmed, Z., additional, Henderson, S., additional, Young, E., additional, Yu, C., additional, Barkats, D., additional, Brown, D., additional, Chaudhuri, S., additional, Cornelison, J., additional, D’Ewart, J. M., additional, Dierickx, M., additional, Dober, B. J., additional, Dusatko, J., additional, Fatigoni, S., additional, Filippini, J. P., additional, Frisch, J. C., additional, Haller, G., additional, Halpern, M., additional, Hilton, G. C., additional, Hubmayr, J., additional, Irwin, K. D., additional, Karkare, K. S., additional, Karpel, E., additional, Kernasovskiy, S. A., additional, Kovac, J. M., additional, Kovacs, A., additional, Kuenstner, S. E., additional, Kuo, C. L., additional, Li, D., additional, Mates, J. A. B., additional, Smith, S., additional, St. Germaine, T., additional, Ullom, J. N., additional, Vale, L. R., additional, Van Winkle, D. D., additional, Vasquez, J., additional, Willmert, J., additional, Zeng, L., additional, Ade, P. A. R., additional, Amiri, M., additional, Basu Thakur, R., additional, Bischoff, C. A., additional, Bock, J. J., additional, Boenish, H., additional, Bullock, E., additional, Buza, V., additional, Cheshire, J., additional, Connors, J., additional, Crumrine, M., additional, Duband, L., additional, Hall, G., additional, Harrison, S., additional, Hildebrandt, S. R., additional, Hui, H., additional, Kang, J., additional, Kefeli, S., additional, Lau, K., additional, Megerian, K. G., additional, Moncelsi, L., additional, Namikawa, T., additional, Nguyen, H. T., additional, O’Brient, R., additional, Palladino, S., additional, Pryke, C., additional, Racine, B., additional, Reintsema, C. D., additional, Richter, S., additional, Schillaci, A., additional, Schwarz, R., additional, Sheehy, C. D., additional, Soliman, A., additional, Steinbach, B., additional, Sudiwala, R. V., additional, Thompson, K. L., additional, Tucker, C., additional, Turner, A. D., additional, Umiltà, C., additional, Vieregg, A. G., additional, Wandui, A., additional, Weber, A. C., additional, Wiebe, D. V., additional, Wu, W. L. K., additional, Yang, H., additional, Yoon, K. W., additional, and Zhang, C., additional

Published
2019
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17. Spontaneous abdominal aortic infections. Essentials of diagnosis and management.

Author

Ewart JM, Burke ML, and Bunt TJ

Subjects
Adolescent, Adult, Age Factors, Aged, Aneurysm, Infected complications, Anti-Bacterial Agents therapeutic use, Aortic Aneurysm diagnostic imaging, Aortic Aneurysm microbiology, Aortic Rupture diagnosis, Aortic Rupture pathology, Aortic Rupture surgery, Aortitis etiology, Aortitis microbiology, Child, Female, Humans, Male, Middle Aged, Salmonella Infections complications, Tomography, X-Ray Computed, Ultrasonography, Aorta, Abdominal microbiology, Aorta, Abdominal surgery, Aortic Diseases diagnosis, Aortic Diseases surgery, Bacterial Infections complications
Abstract

The spectrum, pathogenesis, and changing bacteriology of spontaneous abdominal aortic infections is presented. The classic presentation includes fever, positive blood cultures, and a pulsatile abdominal mass. However, most essential in the preoperative diagnosis is having a high index of suspicion. The bacteriologic spectrum is changing, with Salmonella now being the most common organism cultured. Principles of management include aggressive antibiotic therapy, excision of infected tissue, and extra-anatomic bypass. Long-term follow-up for late complications is important. With early recognition and aggressive combined medical and surgical management, increasing numbers of survivors are being reported.

Published
1983

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