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Title: The POLARBEAR-2 and Simons Array Focal Plane Fabrication Status

Abstract

We present on the status of POLARBEAR-2 A (PB2-A) focal plane fabrication. The PB2-A is the first of three telescopes in the Simons Array, which is an array of three cosmic microwave background polarization-sensitive telescopes located at the POLARBEAR site in Northern Chile. As the successor to the PB experiment, each telescope and receiver combination is named as PB2-A, PB2-B, and PB2-C. PB2-A and -B will have nearly identical receivers operating at 90 and 150 GHz while PB2-C will house a receiver operating at 220 and 270 GHz. Each receiver contains a focal plane consisting of seven close-hex packed lenslet-coupled sinuous antenna transition edge sensor bolometer arrays. Each array contains 271 dichroic optical pixels, each of which has four TES bolometers for a total of 7588 detectors per receiver. We have produced a set of two types of candidate arrays for PB2-A. The first we call Version 11 (V11) uses a silicon oxide (SiOx) for the transmission lines and crossover process for orthogonal polarizations. The second we call Version 13 (V13) uses silicon nitride (SiNx) for the transmission lines and cross-under process for orthogonal polarizations. We have produced enough of each type of array to fully populate the focal planemore » of the PB2-A receiver. The average wirebond yield for V11 and V13 arrays is 93.2% and 95.6%, respectively. The V11 arrays had a superconducting transition temperature (T-c) of 452 +/- 15 mK, a normal resistance (R-n) of 1.25 +/- 0.20 Omega, and saturation powers of 5.2 +/- 1.0 pW and 13 +/- 1.2 pW for the 90 and 150 GHz bands, respectively. The V13 arrays had a superconducting transition temperature (T-c) of 456 +/- 6 mK, a normal resistance (R-n) of 1.1 +/- 0.2 Omega, and saturation powers of 10.8 +/- 1.8 pW and 22.9 +/- 2.6 pW for the 90 and 150 GHz bands, respectively. Production and characterization of arrays for PB2-B are ongoing and are expected to be completed by the summer of 2018. We have fabricated the first three candidate arrays for PB2-C but do not have any characterization results to present at this time.« less

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan; National Science Foundation (NSF); National Aeronautic and Space Administration (NASA); Simons Foundation; Natural Sciences and Engineering Research Council of Canada (NSERC); Japan Society for the Promotion of Science (JSPS); Chilean Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
OSTI Identifier:
1572524
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Journal of Low Temperature Physics
Additional Journal Information:
Journal Volume: 193; Journal Issue: 5-6
Country of Publication:
United States
Language:
English
Subject:
CMB; detectors; fabrication; inflation; instrumentation; polarization; sinuous antenna; transition edge sensor

Citation Formats

Westbrook, B., Ade, P. A. R., Aguilar, M., Aklba, Y., Arnold, K., Baccigalupi, C., Barron, D., Beck, D., Beckman, S., and Bender, A. N. The POLARBEAR-2 and Simons Array Focal Plane Fabrication Status. United States: N. p., 2018. Web. doi:10.1007/s10909-018-2059-0.
Westbrook, B., Ade, P. A. R., Aguilar, M., Aklba, Y., Arnold, K., Baccigalupi, C., Barron, D., Beck, D., Beckman, S., & Bender, A. N. The POLARBEAR-2 and Simons Array Focal Plane Fabrication Status. United States. doi:10.1007/s10909-018-2059-0.
Westbrook, B., Ade, P. A. R., Aguilar, M., Aklba, Y., Arnold, K., Baccigalupi, C., Barron, D., Beck, D., Beckman, S., and Bender, A. N. Sat . "The POLARBEAR-2 and Simons Array Focal Plane Fabrication Status". United States. doi:10.1007/s10909-018-2059-0.
@article{osti_1572524,
title = {The POLARBEAR-2 and Simons Array Focal Plane Fabrication Status},
author = {Westbrook, B. and Ade, P. A. R. and Aguilar, M. and Aklba, Y. and Arnold, K. and Baccigalupi, C. and Barron, D. and Beck, D. and Beckman, S. and Bender, A. N.},
abstractNote = {We present on the status of POLARBEAR-2 A (PB2-A) focal plane fabrication. The PB2-A is the first of three telescopes in the Simons Array, which is an array of three cosmic microwave background polarization-sensitive telescopes located at the POLARBEAR site in Northern Chile. As the successor to the PB experiment, each telescope and receiver combination is named as PB2-A, PB2-B, and PB2-C. PB2-A and -B will have nearly identical receivers operating at 90 and 150 GHz while PB2-C will house a receiver operating at 220 and 270 GHz. Each receiver contains a focal plane consisting of seven close-hex packed lenslet-coupled sinuous antenna transition edge sensor bolometer arrays. Each array contains 271 dichroic optical pixels, each of which has four TES bolometers for a total of 7588 detectors per receiver. We have produced a set of two types of candidate arrays for PB2-A. The first we call Version 11 (V11) uses a silicon oxide (SiOx) for the transmission lines and crossover process for orthogonal polarizations. The second we call Version 13 (V13) uses silicon nitride (SiNx) for the transmission lines and cross-under process for orthogonal polarizations. We have produced enough of each type of array to fully populate the focal plane of the PB2-A receiver. The average wirebond yield for V11 and V13 arrays is 93.2% and 95.6%, respectively. The V11 arrays had a superconducting transition temperature (T-c) of 452 +/- 15 mK, a normal resistance (R-n) of 1.25 +/- 0.20 Omega, and saturation powers of 5.2 +/- 1.0 pW and 13 +/- 1.2 pW for the 90 and 150 GHz bands, respectively. The V13 arrays had a superconducting transition temperature (T-c) of 456 +/- 6 mK, a normal resistance (R-n) of 1.1 +/- 0.2 Omega, and saturation powers of 10.8 +/- 1.8 pW and 22.9 +/- 2.6 pW for the 90 and 150 GHz bands, respectively. Production and characterization of arrays for PB2-B are ongoing and are expected to be completed by the summer of 2018. We have fabricated the first three candidate arrays for PB2-C but do not have any characterization results to present at this time.},
doi = {10.1007/s10909-018-2059-0},
journal = {Journal of Low Temperature Physics},
number = 5-6,
volume = 193,
place = {United States},
year = {2018},
month = {12}
}

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