Detector modules and spectrometers for the TIME-Pilot [CII] intensity mapping experiment

Hunacek, Jonathon; Bock, J. J.; Bradford, C. M.; Bumble, B.; Chang, Tzu-Ching; Cheng, Yun-Ting; Cooray, Asantha; Crites, A. T.; Hailey-Dunsheath, S.; Gong, Yan; Li, Chao-Te; O’Brient, R.; Shirokoff, E.; Shiu, C.; Sun, Jason; Staniszewski, Z.; Uzgil, Bade; Zemcov, Michael

doi:10.1117/12.2233762

SPIE Proceedings

2016

DOI: 10.1117/12.2233762

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Detector modules and spectrometers for the TIME-Pilot [CII] intensity mapping experiment

Jonathon Hunacek

J. J. Bock

C. M. Bradford

et al.

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Cited by 3 publications

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References 28 publications

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“…Overview of the case study results showing the final merit function value obtained by following the specified surface order and methodology. The same merit function definition is used in all cases and is a combination of multiple performance metrics: spot size, Lyot stop quality, telecentricity, and distortion, which are set by the TIME science goals[28,29].…”

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Freeform surface selection based on parametric fitness function using modal wavefront fitting

2019

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We present an analytic methodology to guide the selection of a surface within an optical design to apply freeform optimization. The methodology is discussed in the context of other means currently available, such as human intuition, aberration theory, and other direct surface construction methods. We describe the selection criteria for our proposed method and provide the form of the parametric fitness function used to combine the criterion. Finally, a case study comparing a design optimization procedure guided by the proposed methodology to human intuition is presented based on a real instrument designed for a millimeter-wave astronomy application. The methodology is shown to be effective even in the case of an optical system with a large number of freeform/optical surfaces. The proposed approach provides an objective and scalable solution to guide freeform optical system design by aiding a human's design intuition.

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confidence: 99%

Freeform surface selection based on parametric fitness function using modal wavefront fitting

2019

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Hafnium Films and Magnetic Shielding for TIME, A mm-Wavelength Spectrometer Array

et al. 2018

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TIME is a mm-wavelength grating spectrometer array that will map fluctuations of the 157.7 µm emission line of singly ionized carbon ([CII]) during the Epoch of Reionization (redshift z ∼ 5 to 9). 60 transition-edge sensor (TES) bolometers populate the output arc of each of the 32 spectrometers, for a total of 1920 detectors. Each bolometer consists of gold absorber on a ∼ 3 x 3 mm silicon nitride micro-mesh suspended near the corners by 1 x 1 x 500 µm silicon nitride legs targeting a photon-noise-dominated NEP ∼ 1 × 10 −17 W/ √ Hz. Hafnium films are explored as a lower-T c alternative to Ti (500 mK) for TIME TESs, allowing thicker support legs for improved yield. Hf T c is shown to vary between 250 mK and 450 mK when varying the resident Ar pressure during deposition. Magnetic shielding designs and simulations are presented for the TIME first-stage SQUIDs. Total axial field suppression is predicted to be 5 × 10 7 .

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Advances in reconfigurable optical design, metrology, characterization, and data analysis

et al. 2021

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Reconfigurable freeform optical systems greatly enhance imaging performance within non-symmetric, compact, and ergonomic form factors. In this paper, several advances improve design, testing, and monitoring of these systems. Specific enhancements include definition of polynomials for fast and efficient parameterizations of vector distributions in non-circular apertures and merit based function optimization. Deflectometry system improvements enable metrology for almost any conceivable optic shape and guide deterministic optical figuring process during the coarse grinding phase by including modulated infrared sources. As a demonstration of these improvements, parametric optimization is tested with the tomographic ionized-carbon mapping experiment, a reconfigurable optical system. Other case studies and demonstrations include metrology of a fast, f/1.26 convex optic, an Alvarez lens, and real-time monitoring of an array of independently-steerable hexagonal mirror segments as well as an induction formed surface and inflatable Mylar mirror.

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Detector modules and spectrometers for the TIME-Pilot [CII] intensity mapping experiment

Cited by 3 publications

References 28 publications

Freeform surface selection based on parametric fitness function using modal wavefront fitting

Freeform surface selection based on parametric fitness function using modal wavefront fitting

Hafnium Films and Magnetic Shielding for TIME, A mm-Wavelength Spectrometer Array

Advances in reconfigurable optical design, metrology, characterization, and data analysis

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