Development and performance of universal readout harness for the Simons Observatory

Moore, Jenna; Bhandarkar, Tanay; DiGia, Brooke; Duell, Cody J.; Galitzki, Nicholas; Orlowski-Scherer, John; Silva-Feaver, Max; Wang, Yuhan; Wheeler, Caleb; Xu, Zhisheng; Mauskopf, Philip Daniel; Mathewson, Justin

doi:10.1117/12.2630527

Cited by 4 publications

(3 citation statements)

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“…SO uses microwave multiplexing, which allows O(1000) detectors per readout chain. Each readout chain traverses a cold readout assembly (CRA) and universal readout harness (URH) [21,22]. The CRA takes the signal from 100mK to 4K, and the URH takes the signal from 4K to the 300K readout port on the SAT.…”

Section: Sat Designmentioning

confidence: 99%

The Simons Observatory: Design, Integration, and Current Status of Small Aperture Telescopes

Mangu,

Corbett,

Bhimani

et al. 2024

Proceedings of XVIII International Conference on Topics in Astroparticle and Underground Physics — PoS(TAUP2023)

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The Simons Observatory (SO) is a cosmic microwave background (CMB) survey experiment located in the Atacama Desert in Chile at an elevation of 5200 meters, nominally consisting of an array of three 0.42-meter small aperture telescopes (SATs) and one 6-meter large aperture telescope (LAT). SO will make accurate measurements of the CMB temperature and polarization spanning six frequency bands ranging from 27 to 280 GHz, fielding a total of ∼68,000 detectors covering angular scales between one arcminute to tens of degrees. In this paper, we focus on the SATs, which are tailored to search for primordial gravitational waves, with the primary science goal of measuring the primordial tensor-to-scalar ratio r at a target level of 𝜎(𝑟) ≈ 0.003. We discuss the design drivers, scientific impact, and current deployment status of the three SATs, which are scheduled to start taking data in the coming year. The SATs aim to map 10% of the sky at a 2 𝜇K-arcmin noise level observing at mid-frequencies (93/145 GHz), with additional ultra-high-frequency (225/280 GHz) and low-frequency (27/39 GHz) targets to yield galactic foreground-subtracted measurements.

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Section: Sat Designmentioning

confidence: 99%

The Simons Observatory: Design, Integration, and Current Status of Small Aperture Telescopes

Mangu,

Corbett,

Bhimani

et al. 2024

Proceedings of XVIII International Conference on Topics in Astroparticle and Underground Physics — PoS(TAUP2023)

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“…2.2). Thermometry and RF signals are read out through a custom modular harness based on the SO Universal Readout Harness 14,15 that is installed on the opposing side to the DR (Sec. 5).…”

Section: Mechanical Designmentioning

confidence: 99%

CCAT-prime: design of the Mod-Cam receiver and 280 GHz MKID instrument module

Vavagiakis

Duell

Austermann³

et al. 2022

Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy XI

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Mod-Cam is a first light and commissioning instrument for the CCAT-prime project's six-meter aperture Fred Young Submillimeter Telescope (FYST), currently under construction at 5600 m on Cerro Chajnantor in Chile's Atacama Desert. Prime-Cam, a first-generation science instrument for FYST, will deliver over ten times greater mapping speed than current and near-term facilities for unprecedented 280-850 GHz broadband and spectroscopic

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“…From 300 K to 4 K, the LATR readout system is contained within the Universal Readout Harness (URH), an assembly that is used throughout SO receivers. 17 In a single URH, there are up to 12 bias channels and 24 coaxial channel. A bias channel is a 50 pin input that carries 2 flux ramp line pairs, 12 detector bias pair lines, and 4 cryogenic amplifier bias lines.…”

Section: Cold Readout Designmentioning

confidence: 99%

The Simons Observatory: Development and Validation of the Large Aperture Telescope Receiver

Bhandarkar¹,

Bhimani²,

Coppi³

et al. 2022

Preprint

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The Simons Observatory (SO) is a ground-based cosmic microwave background (CMB) survey experiment that consists of three 0.5 m small-aperture telescopes (SATs) and one 6 m large-aperture telescope (LAT), sited at an elevation of 5200 m in the Atacama Desert in Chile. In order to meet the sensitivity requirements set for nextgeneration CMB telescopes, the LAT will deploy 30,000 transition edge sensor (TES) detectors at 100 mK across 7 optics tubes (OT), all within the Large Aperture Telescope Receiver (LATR). Additionally, the LATR has the capability to expand to 62,000 TES across 13 OTs. The LAT will be capable of making arcminute-resolution observations of the CMB, with detector bands centered at 30, 40, 90, 150, 230, and 280 GHz. We have rigorously tested the LATR systems prior to deployment in order to fully characterize the instrument and show that it can achieve the desired sensitivity levels. We show that the LATR meets cryogenic and mechanical requirements, and maintains acceptably low baseline readout noise.

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Development and performance of universal readout harness for the Simons Observatory

Cited by 4 publications

References 0 publications

The Simons Observatory: Design, Integration, and Current Status of Small Aperture Telescopes

The Simons Observatory: Design, Integration, and Current Status of Small Aperture Telescopes

CCAT-prime: design of the Mod-Cam receiver and 280 GHz MKID instrument module

The Simons Observatory: Development and Validation of the Large Aperture Telescope Receiver

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