CCAT-prime: optical and cryogenic design of the 850 GHz module for Prime-Cam

Huber, Anthony; Chapman, Scott C.; Sinclair, Adrian; Spencer, L. D.; Austermann, J. E.; Choi, Steve K.; Devina, Jesslyn; Gallardo, Patricio A.; Henke, Doug; Huber, Zachary B.; Keller, Ben; Li, Yaqiong; Lin, Lawrence T.; Niemack, Mike; Vavagiakis, Eve M.; Rossi, Kayla M.; Wheeler, Jordan

doi:10.1117/12.2630370

Cited by 2 publications

(5 citation statements)

References 16 publications

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“…Huber et al [24] present optical design considerations for the 850 GHz camera module. They consider the trade-off space between 4 and 5 lenses and additional length of the optical design, which adds complexity due to the somewhat reduced space for the cryogenic wiring from the detector stage.…”

Section: Ghz Module Design Considerationsmentioning

confidence: 99%

“…As the number of detectors is practically limited by the readout to ∼40,000 [26], a gain in field size provides a viable direction for mapping speed improvement. However, once anti-reflection losses from the addition of a 5th lens are factored in [24], the gain from increasing field size is substantially eliminated. Thus, an optimal design currently being considered is for a 4-lens, 1.1 • FoV, with ∼40,000 KIDs and F-λ ∼1.65, divided between 3 hexagonal arrays.…”

Section: Ghz Module Design Considerationsmentioning

confidence: 99%

“…The modularity of Prime-Cam enables each optical path to be independently optimized for the science requirements of each instrument module. While the lower frequency modules adopt similar optical designs and layouts to the the Simons Observatory LATR [6,7], as described in [8], the 850 GHz module represents a significant departure from these designs [24]. The 850 GHz module contains a series of anti-reflection coated silicon optics, blocking filters, Lyot stop, and the detector focal plane.…”

Section: Opticsmentioning

confidence: 99%

“…In particular, around 13,000 KIDs with feedhorn coupling will be fabricated at NIST on a single 15-cm diameter wafer (≈40,000 over 3 wafers in the focal plane), which is almost four times higher than the lower frequency arrays. This places large challenges on the frequency multiplexed readout system and cryogenic RF and feed throughs [24,26]. We have presented the overall design for the camera module, detailing the KID detectors design and performance, the Silicon platelet feed horn design, and discussed initial laboratory characterization of the 850-GHz KID test devices.…”

Section: Summary and Future Directionsmentioning

confidence: 99%

“…We have presented the overall design for the camera module, detailing the KID detectors design and performance, the Silicon platelet feed horn design, and discussed initial laboratory characterization of the 850-GHz KID test devices. We referenced the optical and mechanical design of the module discussed in detail in [24], the required tolerances and performance metrics, the readout and software directions detailed in [26].…”

Section: Summary and Future Directionsmentioning

confidence: 99%

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CCAT-prime: the 850GHz camera for prime-cam on FYST

Chapman

Huber

Sinclair

et al. 2022

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

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The Fred Young Submillimeter Telescope (FYST) at the Cerro-Chajnantor Atacama Telescope prime (CCATprime) Facility will host Prime-Cam as a powerful, first generation camera with imaging polarimeters working at several wavelengths and spectroscopic instruments aimed at intensity mapping during the Epoch of Reionization.Here we introduce the 850 GHz (350 micron) instrument module. This will be the highest frequency module in Prime-Cam and the most novel for astronomical and cosmological surveys, taking full advantage of the atmospheric transparency at the high 5600 meter CCAT-prime siting on Cerro Chajnantor. The 850 GHz module will deploy ∼40,000 Kinetic Inductance Detectors (KIDs) with Silicon platelet feedhorn coupling (both fabricated at NIST), and will provide unprecedented broadband intensity and polarization measurement capabilities. The 850 GHz module will be key to addressing pressing astrophysical questions regarding galaxy formation, Big Bang cosmology, and star formation within our own Galaxy. We present the motivation and overall design for the module, and initial laboratory characterization.

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Section: Ghz Module Design Considerationsmentioning

confidence: 99%

Section: Ghz Module Design Considerationsmentioning

confidence: 99%

Section: Opticsmentioning

confidence: 99%

Section: Summary and Future Directionsmentioning

confidence: 99%

Section: Summary and Future Directionsmentioning

confidence: 99%

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CCAT-prime: the 850GHz camera for prime-cam on FYST

Chapman

Huber

Sinclair

et al. 2022

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

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CCAT: design and performance of densely packed, high-frequency, dual-polarization kinetic inductance detectors for the Prime-Cam 850 GHz module

Huber,

Austermann,

Beall

et al. 2024

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

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Prime-Cam is a first-generation instrument designed for the Fred Young Submillimeter Telescope (FYST) in the Cerro Chajnantor Atacama Telescope (CCAT) Facility. Among the instrument modules being developed for the Prime-Cam receiver, the highest frequency 850 GHz module presents unique challenges in optical design, coupling, detection, and readout. The 850 GHz module will incorporate approximately 45,000 polarization-sensitive, lumped-element microwave kinetic inductance detectors (KIDs), which will represent the most KIDs on sky in a single instrument to date. We present the critical aspects of the detector design and discuss solutions to the challenges of efficient optical coupling and a multioctave readout band. Specifically, the designs will include a feature which reduces the inductance across a portion of the detectors by shorting pairs of inductor lines to allow the KIDs to be tuned across four distinct bands across the readout range, all with minimal impact to the responsivity of the detector. Thus, the resonators will be coarsely tuned via the inductance shorts, and finely tuned by etching away small portions of the interdigital capacitors. We further present a comparison between simulations and preliminary results of thermal responsivity. The results of this work will directly inform the design of microwave KIDs for the multi-octave readout architecture as part of the development of densely packed arrays for the Prime-Cam instrument.

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CCAT-prime: optical and cryogenic design of the 850 GHz module for Prime-Cam

Cited by 2 publications

References 16 publications

CCAT-prime: the 850GHz camera for prime-cam on FYST

CCAT-prime: the 850GHz camera for prime-cam on FYST

CCAT: design and performance of densely packed, high-frequency, dual-polarization kinetic inductance detectors for the Prime-Cam 850 GHz module

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