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2 results on '"Silva-Feaver, M"'

1. The Simons Observatory: Magnetic Sensitivity Measurements of Microwave SQUID Multiplexers

Author

Vavagiakis, E, Ahmed, Z, Ali, A, Arnold, K, Austermann, J, Bruno, S, Choi, S, Connors, J, Cothard, N, Dicker, S, Dober, B, Duff, S, Fanfani, V, Healy, E, Henderson, S, Ho, S, Hoang, D, Hilton, G, Hubmayr, J, Krachmalnicoff, N, Li, Y, Mates, J, Mccarrick, H, Nati, F, Niemack, M, Silva-Feaver, M, Staggs, S, Stevens, J, Vissers, M, Ullom, J, Wagoner, K, Xu, Z, Zhu, N, Vavagiakis E. M., Ahmed Z., Ali A., Arnold K., Austermann J., Bruno S. M., Choi S. K., Connors J., Cothard N., Dicker S., Dober B., Duff S., Fanfani V., Healy E., Henderson S., Ho S. -P. P., Hoang D. -T., Hilton G., Hubmayr J., Krachmalnicoff N., Li Y., Mates J., McCarrick H., Nati F., Niemack M., Silva-Feaver M., Staggs S., Stevens J., Vissers M., Ullom J., Wagoner K., Xu Z., Zhu N., Vavagiakis, E, Ahmed, Z, Ali, A, Arnold, K, Austermann, J, Bruno, S, Choi, S, Connors, J, Cothard, N, Dicker, S, Dober, B, Duff, S, Fanfani, V, Healy, E, Henderson, S, Ho, S, Hoang, D, Hilton, G, Hubmayr, J, Krachmalnicoff, N, Li, Y, Mates, J, Mccarrick, H, Nati, F, Niemack, M, Silva-Feaver, M, Staggs, S, Stevens, J, Vissers, M, Ullom, J, Wagoner, K, Xu, Z, Zhu, N, Vavagiakis E. M., Ahmed Z., Ali A., Arnold K., Austermann J., Bruno S. M., Choi S. K., Connors J., Cothard N., Dicker S., Dober B., Duff S., Fanfani V., Healy E., Henderson S., Ho S. -P. P., Hoang D. -T., Hilton G., Hubmayr J., Krachmalnicoff N., Li Y., Mates J., McCarrick H., Nati F., Niemack M., Silva-Feaver M., Staggs S., Stevens J., Vissers M., Ullom J., Wagoner K., Xu Z., and Zhu N.

Abstract

The Simons Observatory (SO) will be a cosmic microwave background (CMB) survey experiment with three small-aperture telescopes and one large-aperture telescope, which will observe from the Atacama Desert in Chile. In total, SO will field $\sim$70,000 transition-edge sensor (TES) bolometers in six spectral bands centered between 27 and 280 GHz in order to achieve the sensitivity necessary to measure or constrain numerous cosmological quantities. The SO Universal Focal Plane Modules (UFMs) each contain a 150 mm diameter TES detector array, horn or lenslet optical coupling, cold readout components, and magnetic shielding. SO will use a microwave SQUID multiplexing ($\mu$MUX) readout at an initial multiplexing factor of $\sim$1000; the cold (100 mK) readout components are packaged in a $\mu$MUX readout module, which is part of the UFM, and can also be characterized independently. The 100 mK stage TES bolometer arrays and microwave SQUIDs are sensitive to magnetic fields, and their measured response will vary with the degree to which they are magnetically shielded. We present measurements of the magnetic pickup of test microwave SQUID multiplexers as a study of various shielding configurations for the Simons Observatory. We discuss how these measurements motivated the material choice and design of the UFM magnetic shielding.

Published
2021

2. Simons Observatory: characterizing the Large Aperture Telescope Receiver with radio holography

Author

Chesmore, G, Harrington, K, Sierra, C, Gallardo, P, Sutariya, S, Alford, T, Adler, A, Bhandarkar, T, Coppi, G, Dachlythra, N, Golec, J, Gudmundsson, J, Haridas, S, Johnson, B, Kofman, A, Iuliano, J, Mcmahon, J, Niemack, M, Orlowski-Scherer, J, Perez Sarmiento, K, Puddu, R, Silva-Feaver, M, Simon, S, Robe, J, Wollack, E, Xu, Z, Grace E. Chesmore, Kathleen Harrington, Carlos E. Sierra, Patricio A. Gallardo, Shreya Sutariya, Tommy Alford, Alexandre E. Adler, Tanay Bhandarkar, Gabriele Coppi, Nadia Dachlythra, Joseph Golec, Jon Gudmundsson, Saianeesh K. Haridas, Bradley R. Johnson, Anna M. Kofman, Jeffrey Iuliano, Jeff McMahon, Michael D. Niemack, John Orlowski-Scherer, Karen Perez Sarmiento, Roberto Puddu, Max Silva-Feaver, Sara M. Simon, Julia Robe, Edward J. Wollack, Zhilei Xu, Chesmore, G, Harrington, K, Sierra, C, Gallardo, P, Sutariya, S, Alford, T, Adler, A, Bhandarkar, T, Coppi, G, Dachlythra, N, Golec, J, Gudmundsson, J, Haridas, S, Johnson, B, Kofman, A, Iuliano, J, Mcmahon, J, Niemack, M, Orlowski-Scherer, J, Perez Sarmiento, K, Puddu, R, Silva-Feaver, M, Simon, S, Robe, J, Wollack, E, Xu, Z, Grace E. Chesmore, Kathleen Harrington, Carlos E. Sierra, Patricio A. Gallardo, Shreya Sutariya, Tommy Alford, Alexandre E. Adler, Tanay Bhandarkar, Gabriele Coppi, Nadia Dachlythra, Joseph Golec, Jon Gudmundsson, Saianeesh K. Haridas, Bradley R. Johnson, Anna M. Kofman, Jeffrey Iuliano, Jeff McMahon, Michael D. Niemack, John Orlowski-Scherer, Karen Perez Sarmiento, Roberto Puddu, Max Silva-Feaver, Sara M. Simon, Julia Robe, Edward J. Wollack, and Zhilei Xu

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.

Published
2022

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