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13 results on '"Kofman, AM"'

1. The Design and Integrated Performance of SPT-3G

Author

Sobrin, JA, Anderson, AJ, Bender, AN, Benson, BA, Dutcher, D, Foster, A, Goeckner-Wald, N, Montgomery, J, Nadolski, A, Rahlin, A, Ade, PAR, Ahmed, Z, Anderes, E, Archipley, M, Austermann, JE, Avva, JS, Aylor, K, Balkenhol, L, Barry, PS, Thakur, R Basu, Benabed, K, Bianchini, F, Bleem, LE, Bouchet, FR, Bryant, L, Byrum, K, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Chaubal, P, Chen, G, Cho, H-M, Chou, T-L, Cliche, J-F, Crawford, TM, Cukierman, A, Daley, C, de Haan, T, Denison, EV, Dibert, K, Ding, J, Dobbs, MA, Everett, W, Feng, C, Ferguson, KR, Fu, J, Galli, S, Gambrel, AE, Gardner, RW, Gualtieri, R, Guns, S, Gupta, N, Guyser, R, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Hivon, E, Holder, GP, Holzapfel, WL, Hood, JC, Howe, D, Huang, N, Irwin, KD, Jeong, OB, Jonas, M, Jones, A, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, S, Kuo, C-L, Lee, AT, Leitch, EM, Lowitz, AE, Lu, C, Meyer, SS, Michalik, D, Millea, M, Natoli, T, Nguyen, H, Noble, GI, Novosad, V, Omori, Y, Padin, S, Pan, Z, Paschos, P, Pearson, J, Posada, CM, Prabhu, K, Quan, W, Reichardt, CL, Riebel, D, Riedel, B, Rouble, M, and Ruhl, JE

Subjects
Astronomical Sciences, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences
Abstract

SPT-3G is the third survey receiver operating on the South Pole Telescope dedicated to high-resolution observations of the cosmic microwave background (CMB). Sensitive measurements of the temperature and polarization anisotropies of the CMB provide a powerful data set for constraining cosmology. Additionally, CMB surveys with arcminute-scale resolution are capable of detecting galaxy clusters, millimeter-wave bright galaxies, and a variety of transient phenomena. The SPT-3G instrument provides a significant improvement in mapping speed over its predecessors, SPT-SZ and SPTpol. The broadband optics design of the instrument achieves a 430 mm diameter image plane across observing bands of 95, 150, and 220 GHz, with 1.2′ FWHM beam response at 150 GHz. In the receiver, this image plane is populated with 2690 dual-polarization, trichroic pixels ( 1/416,000 detectors) read out using a 68× digital frequency-domain multiplexing readout system. In 2018, SPT-3G began a multiyear survey of 1500 deg2 of the southern sky. We summarize the unique optical, cryogenic, detector, and readout technologies employed in SPT-3G, and we report on the integrated performance of the instrument.

Published
2022

2. Constraints on ΛCDM extensions from the SPT-3G 2018 EE and TE power spectra

Author

Balkenhol, L, Dutcher, D, Ade, PAR, Ahmed, Z, Anderes, E, Anderson, AJ, Archipley, M, Avva, JS, Aylor, K, Barry, PS, Thakur, R Basu, Benabed, K, Bender, AN, Benson, BA, Bianchini, F, Bleem, LE, Bouchet, FR, Bryant, L, Byrum, K, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Chaubal, P, Chen, G, Cho, H-M, Chou, T-L, Cliche, J-F, Crawford, TM, Cukierman, A, Daley, C, de Haan, T, Denison, EV, Dibert, K, Ding, J, Dobbs, MA, Everett, W, Feng, C, Ferguson, KR, Foster, A, Fu, J, Galli, S, Gambrel, AE, Gardner, RW, Goeckner-Wald, N, Gualtieri, R, Guns, S, Gupta, N, Guyser, R, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Hivon, E, Holder, GP, Holzapfel, WL, Hood, JC, Howe, D, Huang, N, Irwin, KD, Jeong, OB, Jonas, M, Jones, A, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, S, Kuo, C-L, Lee, AT, Leitch, EM, Lowitz, AE, Lu, C, Meyer, SS, Michalik, D, Millea, M, Montgomery, J, Nadolski, A, Natoli, T, Nguyen, H, Noble, GI, Novosad, V, Omori, Y, Padin, S, Pan, Z, Paschos, P, Pearson, J, Posada, CM, Prabhu, K, Quan, W, Rahlin, A, Reichardt, CL, Riebel, D, Riedel, B, Rouble, M, Ruhl, JE, Sayre, JT, and Schiappucci, E

Subjects
Particle and High Energy Physics, Physical Sciences
Abstract

We present constraints on extensions to the ΛCDM cosmological model from measurements of the E-mode polarization autopower spectrum and the temperature-E-mode cross-power spectrum of the cosmic microwave background (CMB) made using 2018 SPT-3G data. The extensions considered vary the primordial helium abundance, the effective number of relativistic degrees of freedom, the sum of neutrino masses, the relativistic energy density and mass of a sterile neutrino, and the mean spatial curvature. We do not find clear evidence for any of these extensions, from either the SPT-3G 2018 dataset alone or in combination with baryon acoustic oscillation and Planck data. None of these model extensions significantly relax the tension between Hubble-constant, H0, constraints from the CMB and from distance-ladder measurements using Cepheids and supernovae. The addition of the SPT-3G 2018 data to Planck reduces the square-root of the determinants of the parameter covariance matrices by factors of 1.3-2.0 across these models, signaling a substantial reduction in the allowed parameter volume. We also explore CMB-based constraints on H0 from combined SPT, Planck, and ACT DR4 datasets. While individual experiments see some indications of different H0 values between the TT, TE, and EE spectra, the combined H0 constraints are consistent between the three spectra. For the full combined datasets, we report H0=67.49±0.53 km s-1 Mpc-1, which is the tightest constraint on H0 from CMB power spectra to date and in 4.1σ tension with the most precise distance-ladder-based measurement of H0. The SPT-3G survey is planned to continue through at least 2023, with existing maps of combined 2019 and 2020 data already having ∼3.5×lower noise than the maps used in this analysis.

Published
2021

3. Measurement of gravitational lensing of the cosmic microwave background using SPT-3G 2018 data

Author

Pan, Z, Bianchini, F, Wu, WLK, Ade, PAR, Ahmed, Z, Anderes, E, Anderson, AJ, Ansarinejad, B, Archipley, M, Aylor, K, Balkenhol, L, Barry, PS, Thakur, RB, Benabed, K, Bender, AN, Benson, BA, Bleem, LE, Bouchet, FR, Bryant, L, Byrum, K, Camphuis, E, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Chaubal, P, Chen, G, Chichura, PM, Cho, H-M, Chou, T-L, Cliche, J-F, Coerver, A, Crawford, TM, Cukierman, A, Daley, C, de Haan, T, Denison, EV, Dibert, KR, Ding, J, Dobbs, MA, Doussot, A, Dutcher, D, Everett, W, Feng, C, Ferguson, KR, Fichman, K, Foster, A, Fu, J, Galli, S, Gambrel, AE, Gardner, RW, Ge, F, Goeckner-Wald, N, Gualtieri, R, Guidi, F, Guns, S, Gupta, N, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Hivon, E, Holder, GP, Holzapfel, WL, Hood, JC, Howe, D, Huang, N, Irwin, KD, Jeong, O, Jonas, M, Jones, A, Keruzore, F, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, S, Kuo, C-L, Lee, AT, Leitch, EM, Levy, K, Lowitz, AE, Lu, C, Maniyar, A, Menanteau, F, Meyer, SS, Michalik, D, Millea, M, Montgomery, J, Nadolski, A, Nakato, Y, Natoli, T, Nguyen, H, Noble, GI, Novosad, V, Omori, Y, Padin, S, Paschos, P, Pearson, J, Posada, CM, Prabhu, K, Quan, W, Raghunathan, S, Rahimi, M, Rahlin, A, Reichardt, CL, Riebel, D, Riedel, B, Ruhl, JE, Sayre, JT, Schiappucci, E, Shirokoff, E, Smecher, G, Sobrin, JA, Stark, AA, Stephen, J, Story, KT, Suzuki, A, Takakura, S, Tandoi, C, Thompson, KL, Thorne, B, Trendafilova, C, Tucker, C, Umilta, C, Vale, LR, Vanderlinde, K, Vieira, JD, Wang, G, Whitehorn, N, Yefremenko, V, Yoon, KW, Young, MR, Zebrowski, JA, Pan, Z, Bianchini, F, Wu, WLK, Ade, PAR, Ahmed, Z, Anderes, E, Anderson, AJ, Ansarinejad, B, Archipley, M, Aylor, K, Balkenhol, L, Barry, PS, Thakur, RB, Benabed, K, Bender, AN, Benson, BA, Bleem, LE, Bouchet, FR, Bryant, L, Byrum, K, Camphuis, E, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Chaubal, P, Chen, G, Chichura, PM, Cho, H-M, Chou, T-L, Cliche, J-F, Coerver, A, Crawford, TM, Cukierman, A, Daley, C, de Haan, T, Denison, EV, Dibert, KR, Ding, J, Dobbs, MA, Doussot, A, Dutcher, D, Everett, W, Feng, C, Ferguson, KR, Fichman, K, Foster, A, Fu, J, Galli, S, Gambrel, AE, Gardner, RW, Ge, F, Goeckner-Wald, N, Gualtieri, R, Guidi, F, Guns, S, Gupta, N, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Hivon, E, Holder, GP, Holzapfel, WL, Hood, JC, Howe, D, Huang, N, Irwin, KD, Jeong, O, Jonas, M, Jones, A, Keruzore, F, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, S, Kuo, C-L, Lee, AT, Leitch, EM, Levy, K, Lowitz, AE, Lu, C, Maniyar, A, Menanteau, F, Meyer, SS, Michalik, D, Millea, M, Montgomery, J, Nadolski, A, Nakato, Y, Natoli, T, Nguyen, H, Noble, GI, Novosad, V, Omori, Y, Padin, S, Paschos, P, Pearson, J, Posada, CM, Prabhu, K, Quan, W, Raghunathan, S, Rahimi, M, Rahlin, A, Reichardt, CL, Riebel, D, Riedel, B, Ruhl, JE, Sayre, JT, Schiappucci, E, Shirokoff, E, Smecher, G, Sobrin, JA, Stark, AA, Stephen, J, Story, KT, Suzuki, A, Takakura, S, Tandoi, C, Thompson, KL, Thorne, B, Trendafilova, C, Tucker, C, Umilta, C, Vale, LR, Vanderlinde, K, Vieira, JD, Wang, G, Whitehorn, N, Yefremenko, V, Yoon, KW, Young, MR, and Zebrowski, JA

Published
2023

4. Performance and characterization of the SPT-3G digital frequency-domain multiplexed readout system using an improved noise and crosstalk model

Author

Montgomery, J, Ade, PAR, Ahmed, Z, Anderes, E, Anderson, AJ, Archipley, MA, Avva, JS, Aylor, K, Balkenhol, L, Barry, PS, Thakur, RB, Benabed, K, Bender, AN, Benson, BA, Bianchini, F, Bleem, LE, Bouchet, FR, Bryant, L, Byrum, K, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Chaubal, P, Chen, G, Cho, H-M, Chou, T-L, Cliche, J-F, Crawford, TM, Cukierman, AJ, Daley, CM, de Haan, T, Denison, E, Dibert, K, Ding, J, Dobbs, MA, Dutcher, D, Elleflot, T, Everett, WB, Feng, C, Ferguson, KR, Foster, A, Fu, J, Galli, S, Gambrel, AE, Gardner, RW, Goeckner-Wald, N, Groh, JC, Gualtieri, R, Guns, ST, Gupta, N, Guyser, RJ, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Hivon, EF, Holzapfel, WL, Hood, JC, Howe, D, Huang, N, Irwin, KD, Jeong, OB, Jonas, M, Jones, A, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, SE, Kuo, C-L, Lee, AT, Leitch, EM, Lowitz, AE, Lu, C, Meyer, SS, Michalik, D, Millea, M, Nadolski, A, Natoli, TJ, Nguyen, H, Noble, G, Novosad, V, Omori, Y, Padin, S, Pan, Z, Paschos, P, Pearson, JE, Posada, CM, Prabhu, K, Quan, W, Rahlin, AS, Reichardt, CL, Riebel, D, Riedel, B, Rouble, M, Ruhl, JE, Sayre, JT, Schiappucci, E, Shirokoff, E, Smecher, GM, Sobrin, JA, Stark, AA, Stephen, J, Story, KT, Suzuki, A, Thompson, KL, Thorne, B, Tucker, CE, Umilta, C, Vale, LR, Vanderlinde, K, Vieira, JD, Wang, G, Whitehorn, N, Wu, WLK, Yefremenko, VG, Yoon, KW, Young, MR, Montgomery, J, Ade, PAR, Ahmed, Z, Anderes, E, Anderson, AJ, Archipley, MA, Avva, JS, Aylor, K, Balkenhol, L, Barry, PS, Thakur, RB, Benabed, K, Bender, AN, Benson, BA, Bianchini, F, Bleem, LE, Bouchet, FR, Bryant, L, Byrum, K, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Chaubal, P, Chen, G, Cho, H-M, Chou, T-L, Cliche, J-F, Crawford, TM, Cukierman, AJ, Daley, CM, de Haan, T, Denison, E, Dibert, K, Ding, J, Dobbs, MA, Dutcher, D, Elleflot, T, Everett, WB, Feng, C, Ferguson, KR, Foster, A, Fu, J, Galli, S, Gambrel, AE, Gardner, RW, Goeckner-Wald, N, Groh, JC, Gualtieri, R, Guns, ST, Gupta, N, Guyser, RJ, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Hivon, EF, Holzapfel, WL, Hood, JC, Howe, D, Huang, N, Irwin, KD, Jeong, OB, Jonas, M, Jones, A, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, SE, Kuo, C-L, Lee, AT, Leitch, EM, Lowitz, AE, Lu, C, Meyer, SS, Michalik, D, Millea, M, Nadolski, A, Natoli, TJ, Nguyen, H, Noble, G, Novosad, V, Omori, Y, Padin, S, Pan, Z, Paschos, P, Pearson, JE, Posada, CM, Prabhu, K, Quan, W, Rahlin, AS, Reichardt, CL, Riebel, D, Riedel, B, Rouble, M, Ruhl, JE, Sayre, JT, Schiappucci, E, Shirokoff, E, Smecher, GM, Sobrin, JA, Stark, AA, Stephen, J, Story, KT, Suzuki, A, Thompson, KL, Thorne, B, Tucker, CE, Umilta, C, Vale, LR, Vanderlinde, K, Vieira, JD, Wang, G, Whitehorn, N, Wu, WLK, Yefremenko, VG, Yoon, KW, and Young, MR

Abstract

The third-generation South Pole Telescope camera (SPT-3G) improves upon its predecessor (SPTpol) by an order of magnitude increase in detectors on the focal plane. The technology used to read out and control these detectors, digital frequency-domain multiplexing (DfMUX), is conceptually the same as used for SPTpol, but extended to accommodate more detectors. A nearly 5× expansion in the readout operating bandwidth has enabled the use of this large focal plane, and SPT-3G performance meets the forecasting targets relevant to its science objectives. However, the electrical dynamics of the higher-bandwidth readout differ from predictions based on models of the SPTpol system due to the higher frequencies used and parasitic impedances associated with new cryogenic electronic architecture. To address this, we present an updated derivation for electrical crosstalk in higher-bandwidth DfMUX systems and identify two previously uncharacterized contributions to readout noise, which become dominant at high bias frequency. The updated crosstalk and noise models successfully describe the measured crosstalk and readout noise performance of SPT-3G. These results also suggest specific changes to warm electronics component values, wire-harness properties, and SQUID parameters, to improve the readout system for future experiments using DfMUX, such as the LiteBIRD space telescope.

Published
2022

5. Measurements of the E-mode polarization and temperature-E-mode correlation of the CMB from SPT-3G 2018 data

Author

Dutcher, D, Balkenhol, L, Ade, PAR, Ahmed, Z, Anderes, E, Anderson, AJ, Archipley, M, Avva, JS, Aylor, K, Barry, PS, Thakur, RB, Benabed, K, Bender, AN, Benson, BA, Bianchini, F, Bleem, LE, Bouchet, FR, Bryant, L, Byrum, K, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Chaubal, P, Chen, G, Cho, H-M, Chou, T-L, Cliche, J-F, Crawford, TM, Cukierman, A, Daley, C, de Haan, T, Denison, E, Dibert, K, Ding, J, Dobbs, MA, Everett, W, Feng, C, Ferguson, KR, Foster, A, Fu, J, Galli, S, Gambrel, AE, Gardner, RW, Goeckner-Wald, N, Gualtieri, R, Guns, S, Gupta, N, Guyser, R, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Hivon, E, Holder, GP, Holzapfel, WL, Hood, JC, Howe, D, Huang, N, Irwin, KD, Jeong, OB, Jonas, M, Jones, A, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, S, Kuo, C-L, Lee, AT, Leitch, EM, Lowitz, AE, Lu, C, Meyer, SS, Michalik, D, Millea, M, Montgomery, J, Nadolski, A, Natoli, T, Nguyen, H, Noble, G, Novosad, V, Omori, Y, Padin, S, Pan, Z, Paschos, P, Pearson, J, Posada, CM, Prabhu, K, Quan, W, Raghunathan, S, Rahlin, A, Reichardt, CL, Riebel, D, Riedel, B, Rouble, M, Ruhl, JE, Sayre, JT, Schiappucci, E, Shirokoff, E, Smecher, G, Sobrin, JA, Stark, AA, Stephen, J, Story, KT, Suzuki, A, Thompson, KL, Thorne, B, Tucker, C, Umilta, C, Vale, LR, Vanderlinde, K, Vieira, JD, Wang, G, Whitehorn, N, Wu, WLK, Yefremenko, V, Yoon, KW, Young, MR, Dutcher, D, Balkenhol, L, Ade, PAR, Ahmed, Z, Anderes, E, Anderson, AJ, Archipley, M, Avva, JS, Aylor, K, Barry, PS, Thakur, RB, Benabed, K, Bender, AN, Benson, BA, Bianchini, F, Bleem, LE, Bouchet, FR, Bryant, L, Byrum, K, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Chaubal, P, Chen, G, Cho, H-M, Chou, T-L, Cliche, J-F, Crawford, TM, Cukierman, A, Daley, C, de Haan, T, Denison, E, Dibert, K, Ding, J, Dobbs, MA, Everett, W, Feng, C, Ferguson, KR, Foster, A, Fu, J, Galli, S, Gambrel, AE, Gardner, RW, Goeckner-Wald, N, Gualtieri, R, Guns, S, Gupta, N, Guyser, R, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Hivon, E, Holder, GP, Holzapfel, WL, Hood, JC, Howe, D, Huang, N, Irwin, KD, Jeong, OB, Jonas, M, Jones, A, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, S, Kuo, C-L, Lee, AT, Leitch, EM, Lowitz, AE, Lu, C, Meyer, SS, Michalik, D, Millea, M, Montgomery, J, Nadolski, A, Natoli, T, Nguyen, H, Noble, G, Novosad, V, Omori, Y, Padin, S, Pan, Z, Paschos, P, Pearson, J, Posada, CM, Prabhu, K, Quan, W, Raghunathan, S, Rahlin, A, Reichardt, CL, Riebel, D, Riedel, B, Rouble, M, Ruhl, JE, Sayre, JT, Schiappucci, E, Shirokoff, E, Smecher, G, Sobrin, JA, Stark, AA, Stephen, J, Story, KT, Suzuki, A, Thompson, KL, Thorne, B, Tucker, C, Umilta, C, Vale, LR, Vanderlinde, K, Vieira, JD, Wang, G, Whitehorn, N, Wu, WLK, Yefremenko, V, Yoon, KW, and Young, MR

Published
2021

6. Constraints on Lambda CDM extensions from the SPT-3G 2018 EE and TE power spectra

Author

Balkenhol, L, Dutcher, D, Ade, PAR, Ahmed, Z, Anderes, E, Anderson, AJ, Archipley, M, Avva, JS, Aylor, K, Barry, PS, Thakur, RB, Benabed, K, Bender, AN, Benson, BA, Bianchini, F, Bleem, LE, Bouchet, FR, Bryant, L, Byrum, K, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Chaubal, P, Chen, G, Cho, H-M, Chou, T-L, Cliche, J-F, Crawford, TM, Cukierman, A, Daley, C, de Haan, T, Denison, E, Dibert, K, Ding, J, Dobbs, MA, Everett, W, Feng, C, Ferguson, KR, Foster, A, Fu, J, Galli, S, Gambrel, AE, Gardner, RW, Goeckner-Wald, N, Gualtieri, R, Guns, S, Gupta, N, Guyser, R, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Hivon, E, Holder, GP, Holzapfel, WL, Hood, JC, Howe, D, Huang, N, Irwin, KD, Jeong, OB, Jonas, M, Jones, A, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, S, Kuo, C-L, Lee, AT, Leitch, EM, Lowitz, AE, Lu, C, Meyer, SS, Michalik, D, Millea, M, Montgomery, J, Nadolski, A, Natoli, T, Nguyen, H, Noble, G, Novosad, V, Omori, Y, Padin, S, Pan, Z, Paschos, P, Pearson, J, Posada, CM, Prabhu, K, Quan, W, Rahlin, A, Reichardt, CL, Riebel, D, Riedel, B, Rouble, M, Ruhl, JE, Sayre, JT, Schiappucci, E, Shirokoff, E, Smecher, G, Sobrin, JA, Stark, AA, Stephen, J, Story, KT, Suzuki, A, Thompson, KL, Thorne, B, Tucker, C, Umilta, C, Vale, LR, Vanderlinde, K, Vieira, JD, Wang, G, Whitehorn, N, Wu, WLK, Yefremenko, V, Yoon, KW, Young, MR, Balkenhol, L, Dutcher, D, Ade, PAR, Ahmed, Z, Anderes, E, Anderson, AJ, Archipley, M, Avva, JS, Aylor, K, Barry, PS, Thakur, RB, Benabed, K, Bender, AN, Benson, BA, Bianchini, F, Bleem, LE, Bouchet, FR, Bryant, L, Byrum, K, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Chaubal, P, Chen, G, Cho, H-M, Chou, T-L, Cliche, J-F, Crawford, TM, Cukierman, A, Daley, C, de Haan, T, Denison, E, Dibert, K, Ding, J, Dobbs, MA, Everett, W, Feng, C, Ferguson, KR, Foster, A, Fu, J, Galli, S, Gambrel, AE, Gardner, RW, Goeckner-Wald, N, Gualtieri, R, Guns, S, Gupta, N, Guyser, R, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Hivon, E, Holder, GP, Holzapfel, WL, Hood, JC, Howe, D, Huang, N, Irwin, KD, Jeong, OB, Jonas, M, Jones, A, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, S, Kuo, C-L, Lee, AT, Leitch, EM, Lowitz, AE, Lu, C, Meyer, SS, Michalik, D, Millea, M, Montgomery, J, Nadolski, A, Natoli, T, Nguyen, H, Noble, G, Novosad, V, Omori, Y, Padin, S, Pan, Z, Paschos, P, Pearson, J, Posada, CM, Prabhu, K, Quan, W, Rahlin, A, Reichardt, CL, Riebel, D, Riedel, B, Rouble, M, Ruhl, JE, Sayre, JT, Schiappucci, E, Shirokoff, E, Smecher, G, Sobrin, JA, Stark, AA, Stephen, J, Story, KT, Suzuki, A, Thompson, KL, Thorne, B, Tucker, C, Umilta, C, Vale, LR, Vanderlinde, K, Vieira, JD, Wang, G, Whitehorn, N, Wu, WLK, Yefremenko, V, Yoon, KW, and Young, MR

Published
2021

7. Detection of Galactic and Extragalactic Millimeter-wavelength Transient Sources with SPT-3G

Author

Guns, S, Foster, A, Daley, C, Rahlin, A, Whitehorn, N, Ade, PAR, Ahmed, Z, Anderes, E, Anderson, AJ, Archipley, M, Avva, JS, Aylor, K, Balkenhol, L, Barry, PS, Basu Thakur, R, Benabed, K, Bender, AN, Benson, BA, Bianchini, F, Bleem, LE, Bouchet, FR, Bryant, L, Byrum, K, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Chaubal, P, Chen, G, Cho, H-M, Chou, T-L, Cliche, J-F, Crawford, TM, Cukierman, A, de Haan, T, Denison, EV, Dibert, K, Ding, J, Dobbs, MA, Dutcher, D, Everett, W, Feng, C, Ferguson, KR, Fu, J, Galli, S, Gambrel, AE, Gardner, RW, Goeckner-Wald, N, Gualtieri, R, Gupta, N, Guyser, R, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Hivon, E, Holder, GP, Holzapfel, WL, Hood, JC, Howe, D, Huang, N, Irwin, KD, Jeong, OB, Jonas, M, Jones, A, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, S, Kuo, C-L, Lee, AT, Leitch, EM, Lowitz, AE, Lu, C, Marrone, DP, Meyer, SS, Michalik, D, Millea, M, Montgomery, J, Nadolski, A, Natoli, T, Nguyen, H, Noble, GI, Novosad, V, Omori, Y, Padin, S, Pan, Z, Paschos, P, Pearson, J, Phadke, KA, Posada, CM, Prabhu, K, Quan, W, Reichardt, CL, Riebel, D, Riedel, B, Rouble, M, Ruhl, JE, Sayre, JT, Schiappucci, E, Shirokoff, E, Smecher, G, Sobrin, JA, Stark, AA, Stephen, J, Story, KT, Suzuki, A, Thompson, KL, Thorne, B, Tucker, C, Umilta, C, Vale, LR, Vieira, JD, Wang, G, Wu, WLK, Yefremenko, V, Yoon, KW, Young, MR, Zhang, L, Guns, S, Foster, A, Daley, C, Rahlin, A, Whitehorn, N, Ade, PAR, Ahmed, Z, Anderes, E, Anderson, AJ, Archipley, M, Avva, JS, Aylor, K, Balkenhol, L, Barry, PS, Basu Thakur, R, Benabed, K, Bender, AN, Benson, BA, Bianchini, F, Bleem, LE, Bouchet, FR, Bryant, L, Byrum, K, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Chaubal, P, Chen, G, Cho, H-M, Chou, T-L, Cliche, J-F, Crawford, TM, Cukierman, A, de Haan, T, Denison, EV, Dibert, K, Ding, J, Dobbs, MA, Dutcher, D, Everett, W, Feng, C, Ferguson, KR, Fu, J, Galli, S, Gambrel, AE, Gardner, RW, Goeckner-Wald, N, Gualtieri, R, Gupta, N, Guyser, R, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Hivon, E, Holder, GP, Holzapfel, WL, Hood, JC, Howe, D, Huang, N, Irwin, KD, Jeong, OB, Jonas, M, Jones, A, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, S, Kuo, C-L, Lee, AT, Leitch, EM, Lowitz, AE, Lu, C, Marrone, DP, Meyer, SS, Michalik, D, Millea, M, Montgomery, J, Nadolski, A, Natoli, T, Nguyen, H, Noble, GI, Novosad, V, Omori, Y, Padin, S, Pan, Z, Paschos, P, Pearson, J, Phadke, KA, Posada, CM, Prabhu, K, Quan, W, Reichardt, CL, Riebel, D, Riedel, B, Rouble, M, Ruhl, JE, Sayre, JT, Schiappucci, E, Shirokoff, E, Smecher, G, Sobrin, JA, Stark, AA, Stephen, J, Story, KT, Suzuki, A, Thompson, KL, Thorne, B, Tucker, C, Umilta, C, Vale, LR, Vieira, JD, Wang, G, Wu, WLK, Yefremenko, V, Yoon, KW, Young, MR, and Zhang, L

Abstract

High angular resolution cosmic microwave background experiments provide a unique opportunity to conduct a survey of time-variable sources at millimeter wavelengths, a population that has primarily been understood through follow-up measurements of detections in other bands. Here we report the first results of an astronomical transient survey with the South Pole Telescope (SPT) using the SPT-3G camera to observe 1500 deg2 of the southern sky. The observations took place from 2020 March to November in three bands centered at 95, 150, and 220 GHz. This survey yielded the detection of 15 transient events from sources not previously detected by the SPT. The majority are associated with variable stars of different types, expanding the number of such detected flares by more than a factor of two. The stellar flares are unpolarized and bright, in some cases exceeding 1 Jy, and have durations from a few minutes to several hours. Another population of detected events last for 2–3 weeks and appear to be extragalactic in origin. Though data availability at other wavelengths is limited, we find evidence for concurrent optical activity for two of the stellar flares. Future data from SPT-3G and forthcoming instruments will provide real-time detection of millimeter-wave transients on timescales of minutes to months.

Published
2021

8. The Simons Observatory: modeling optical systematics in the Large Aperture Telescope

Author

Gudmundsson, JE, Gallardo, PA, Puddu, R, Dicker, SR, Adler, AE, Ali, AM, Bazarko, A, Chesmore, GE, Coppi, G, Cothard, NF, Dachlythra, N, Devlin, M, Dunner, R, Fabbian, G, Galitzki, N, Golec, JE, Ho, S-PP, Hargrave, PC, Kofman, AM, Lee, AT, Limon, M, Matsuda, FT, Mauskopf, PD, Moodley, K, Nati, F, Niemack, MD, Orlowski-Scherer, J, Page, LA, Partridge, B, Puglisi, G, Reichardt, CL, Sierra, CE, Simon, SM, Teply, GP, Tucker, C, Wollack, EJ, Xu, Z, Zhu, N, Gudmundsson, JE, Gallardo, PA, Puddu, R, Dicker, SR, Adler, AE, Ali, AM, Bazarko, A, Chesmore, GE, Coppi, G, Cothard, NF, Dachlythra, N, Devlin, M, Dunner, R, Fabbian, G, Galitzki, N, Golec, JE, Ho, S-PP, Hargrave, PC, Kofman, AM, Lee, AT, Limon, M, Matsuda, FT, Mauskopf, PD, Moodley, K, Nati, F, Niemack, MD, Orlowski-Scherer, J, Page, LA, Partridge, B, Puglisi, G, Reichardt, CL, Sierra, CE, Simon, SM, Teply, GP, Tucker, C, Wollack, EJ, Xu, Z, and Zhu, N

Abstract

We present geometrical and physical optics simulation results for the Simons Observatory Large Aperture Telescope. This work was developed as part of the general design process for the telescope, allowing us to evaluate the impact of various design choices on performance metrics and potential systematic effects. The primary goal of the simulations was to evaluate the final design of the reflectors and the cold optics that are now being built. We describe nonsequential ray tracing used to inform the design of the cold optics, including absorbers internal to each optics tube. We discuss ray tracing simulations of the telescope structure that allow us to determine geometries that minimize detector loading and mitigate spurious near-field effects that have not been resolved by the internal baffling. We also describe physical optics simulations, performed over a range of frequencies and field locations, that produce estimates of monochromatic far-field beam patterns, which in turn are used to gauge general optical performance. Finally, we describe simulations that shed light on beam sidelobes from panel gap diffraction.

Published
2021

9. Year two instrument status of the SPT-3G cosmic microwave background receiver

Author

Zmuidzinas, J, Gao, JR, Bender, AN, Ade, PAR, Ahmed, Z, Anderson, AJ, Avva, JS, Aylor, K, Barry, PS, Thakur, RB, Benson, BA, Bleem, LS, Bocquet, S, Byrum, K, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Cho, H-M, Cliche, JF, Crawford, TM, Cukierman, A, de Haan, T, Denison, EV, Ding, J, Dobbs, MA, Dodelson, S, Dutcher, D, Everett, W, Foster, A, Gallicchio, J, Gilbert, A, Groh, JC, Guns, ST, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Holder, GP, Holzapfel, WL, Huang, N, Irwin, KD, Jeong, OB, Jonas, M, Jones, A, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, S, Kuo, C-L, Lee, AT, Leitch, EM, Lowitz, AE, Meyer, SS, Michalik, D, Montgomery, J, Nadolski, A, Natoli, T, Nguyen, H, Noble, GI, Novosad, V, Padin, S, Pan, Z, Pearson, J, Posada, CM, Quan, W, Raghunathan, S, Rahlin, A, Reichardt, CL, Ruhl, JE, Sayre, JT, Shirokoff, E, Smecher, G, Sobrin, JA, Stark, AA, Story, KT, Suzuki, A, Thompson, KL, Tucker, C, Vale, LR, Vanderlinde, K, Vieira, JD, Wang, G, Whitehorn, N, Wu, WLK, Yefremenko, V, Yoon, KW, Young, MR, Zmuidzinas, J, Gao, JR, Bender, AN, Ade, PAR, Ahmed, Z, Anderson, AJ, Avva, JS, Aylor, K, Barry, PS, Thakur, RB, Benson, BA, Bleem, LS, Bocquet, S, Byrum, K, Carlstrom, JE, Carter, FW, Cecil, TW, Chang, CL, Cho, H-M, Cliche, JF, Crawford, TM, Cukierman, A, de Haan, T, Denison, EV, Ding, J, Dobbs, MA, Dodelson, S, Dutcher, D, Everett, W, Foster, A, Gallicchio, J, Gilbert, A, Groh, JC, Guns, ST, Halverson, NW, Harke-Hosemann, AH, Harrington, NL, Henning, JW, Hilton, GC, Holder, GP, Holzapfel, WL, Huang, N, Irwin, KD, Jeong, OB, Jonas, M, Jones, A, Khaire, TS, Knox, L, Kofman, AM, Korman, M, Kubik, DL, Kuhlmann, S, Kuo, C-L, Lee, AT, Leitch, EM, Lowitz, AE, Meyer, SS, Michalik, D, Montgomery, J, Nadolski, A, Natoli, T, Nguyen, H, Noble, GI, Novosad, V, Padin, S, Pan, Z, Pearson, J, Posada, CM, Quan, W, Raghunathan, S, Rahlin, A, Reichardt, CL, Ruhl, JE, Sayre, JT, Shirokoff, E, Smecher, G, Sobrin, JA, Stark, AA, Story, KT, Suzuki, A, Thompson, KL, Tucker, C, Vale, LR, Vanderlinde, K, Vieira, JD, Wang, G, Whitehorn, N, Wu, WLK, Yefremenko, V, Yoon, KW, and Young, MR

Published
2018

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

Author

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.

Published
2022
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11. The Simons Observatory: A large-diameter truss for a refracting telescope cooled to 1 K.

Author

Crowley KD, Dow P, Shroyer JE, Groh JC, Dober B, Spisak J, Galitzki N, Bhandarkar T, Devlin MJ, Dicker S, Gallardo PA, Harrington K, Iuliano J, Johnson BR, Johnson D, Kofman AM, Kusaka A, Lee A, Limon M, Nati F, Orlowski-Scherer J, Page L, Randall M, Teply G, Tsan T, Wollack EJ, Xu Z, and Zhu N

Abstract

We present the design and measured performance of a new carbon fiber strut design that is used in a cryogenically cooled truss for the Simons Observatory small aperture telescope. The truss consists of two aluminum 6061 rings separated by 24 struts. Each strut consists of a central carbon fiber tube fitted with two aluminum end caps. We tested the performance of the strut and truss by (i) cryogenically cycling and destructively pull-testing strut samples, (ii) non-destructively pull-testing the final truss, and (iii) measuring the thermal conductivity of the carbon fiber tubes. We found that the strut strength is limited by the mounting fasteners and the strut end caps, not the epoxy adhesive or the carbon fiber tube. This result is consistent with our numerical predictions. Our thermal measurements suggest that the conductive heat load through the struts (from 4 to 1 K) will be less than 1 mW. This strut design may be a promising candidate for use in other cryogenic support structures.

Published
2022
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12. The Simons Observatory: modeling optical systematics in the Large Aperture Telescope.

Author

Gudmundsson JE, Gallardo PA, Puddu R, Dicker SR, Adler AE, Ali AM, Bazarko A, Chesmore GE, Coppi G, Cothard NF, Dachlythra N, Devlin M, Dünner R, Fabbian G, Galitzki N, Golec JE, Patty Ho SP, Hargrave PC, Kofman AM, Lee AT, Limon M, Matsuda FT, Mauskopf PD, Moodley K, Nati F, Niemack MD, Orlowski-Scherer J, Page LA, Partridge B, Puglisi G, Reichardt CL, Sierra CE, Simon SM, Teply GP, Tucker C, Wollack EJ, Xu Z, and Zhu N

Abstract

We present geometrical and physical optics simulation results for the Simons Observatory Large Aperture Telescope. This work was developed as part of the general design process for the telescope, allowing us to evaluate the impact of various design choices on performance metrics and potential systematic effects. The primary goal of the simulations was to evaluate the final design of the reflectors and the cold optics that are now being built. We describe nonsequential ray tracing used to inform the design of the cold optics, including absorbers internal to each optics tube. We discuss ray tracing simulations of the telescope structure that allow us to determine geometries that minimize detector loading and mitigate spurious near-field effects that have not been resolved by the internal baffling. We also describe physical optics simulations, performed over a range of frequencies and field locations, that produce estimates of monochromatic far-field beam patterns, which in turn are used to gauge general optical performance. Finally, we describe simulations that shed light on beam sidelobes from panel gap diffraction.

Published
2021
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13. Broadband, millimeter-wave antireflection coatings for large-format, cryogenic aluminum oxide optics.

Author

Nadolski A, Vieira JD, Sobrin JA, Kofman AM, Ade PAR, Ahmed Z, Anderson AJ, Avva JS, Basu Thakur R, Bender AN, Benson BA, Bryant L, Carlstrom JE, Carter FW, Cecil TW, Chang CL, Cheshire JR, Chesmore GE, Cliche JF, Cukierman A, de Haan T, Dierickx M, Ding J, Dutcher D, Everett W, Farwick J, Ferguson KR, Florez L, Foster A, Fu J, Gallicchio J, Gambrel AE, Gardner RW, Groh JC, Guns S, Guyser R, Halverson NW, Harke-Hosemann AH, Harrington NL, Harris RJ, Henning JW, Holzapfel WL, Howe D, Huang N, Irwin KD, Jeong O, Jonas M, Jones A, Korman M, Kovac J, Kubik DL, Kuhlmann S, Kuo CL, Lee AT, Lowitz AE, McMahon J, Meier J, Meyer SS, Michalik D, Montgomery J, Natoli T, Nguyen H, Noble GI, Novosad V, Padin S, Pan Z, Paschos P, Pearson J, Posada CM, Quan W, Rahlin A, Riebel D, Ruhl JE, Sayre JT, Shirokoff E, Smecher G, Stark AA, Stephen J, Story KT, Suzuki A, Tandoi C, Thompson KL, Tucker C, Vanderlinde K, Wang G, Whitehorn N, Yefremenko V, Yoon KW, and Young MR

Abstract

We present two prescriptions for broadband ($ {\sim} 77 - 252\;{\rm GHz} $), millimeter-wave antireflection coatings for cryogenic, sintered polycrystalline aluminum oxide optics: one for large-format (700 mm diameter) planar and plano-convex elements, the other for densely packed arrays of quasi-optical elements-in our case, 5 mm diameter half-spheres (called "lenslets"). The coatings comprise three layers of commercially available, polytetrafluoroethylene-based, dielectric sheet material. The lenslet coating is molded to fit the 150 mm diameter arrays directly, while the large-diameter lenses are coated using a tiled approach. We review the fabrication processes for both prescriptions, then discuss laboratory measurements of their transmittance and reflectance. In addition, we present the inferred refractive indices and loss tangents for the coating materials and the aluminum oxide substrate. We find that at 150 GHz and 300 K the large-format coating sample achieves $ (97 \pm 2)\% $ transmittance, and the lenslet coating sample achieves $ (94 \pm 3)\% $ transmittance.

Published
2020
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