Design and Fabrication of TES Detector Modules 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; Kenyon, M.; Koch, Patrick M.; Li, Chao-Te; O’Brient, R.; Shirokoff, E.; Shiu, C.; Staniszewski, Z.; Uzgil, Bade; Zemcov, M.

doi:10.1007/s10909-015-1359-x

Cited by 4 publications

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“…4) rather than being placed on the outer edge, thus leaving space for wire bonding to the circuity beneath while still allowing modules to be mounted adjacently for continuous spectral coverage (an overview of the method used to produce these notches can be found in Hunacek et. al 2016 21 ). Large gold thermal pads allow heat sinking of the devices to their aluminum holders.…”

Section: Scientific Motivationmentioning

confidence: 99%

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

et al. 2016

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Section: Scientific Motivationmentioning

confidence: 99%

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

et al. 2016

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“…1. Transition edge sensor (TES) [4] detectors are mounted along the output curve to measure the intensity of each frequency bin. Signals coupled to each spectrometer are confined and propagate within the parallel plate region in the TE1 mode, with two degrees of freedom.…”

Section: Waveguide Grating Spectrometermentioning

confidence: 99%

TIME millimeter wave grating spectrometer

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et al. 2018

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

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The Tomographic Ionized-carbon Mapping Experiment (TIME) utilizes grating spectrometers to achieve instantaneous wideband coverage with background-limited sensitivity. A unique approach is employed in which curved gratings are used in parallel plate waveguides to focus and diffract broadband light from feed horns toward detector arrays. TIME will measure singly ionized carbon fluctuations from 5 < z < 9 with an imaging spectrometer. 32 independent spectrometers are assembled into two stacks of 16, one per polarization. Each grating has 210 facets and provides a resolving power R of ~ 200 over the 186-324 GHz frequency range. The dispersed light is detected using 2-D arrays of transition edge sensor bolometers. The instrument is housed in a closed-cycle 4K-1K-300mK cryostat. The spectrometers and detectors are cooled using a dual-stage 250/300 mK refrigerator.

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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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Design and Fabrication of TES Detector Modules for the TIME-Pilot [CII] Intensity Mapping Experiment

Cited by 4 publications

References 14 publications

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

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

TIME millimeter wave grating spectrometer

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

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