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TIME millimeter wave grating spectrometer

Li, Chao-Te and Bradford, C. M. and Crites, Abigail and Hunacek, Jonathon and Wei, Tashun and Cheng, Jen-Chieh and Chang, Tzu-Ching and Bock, James (2018) TIME millimeter wave grating spectrometer. In: Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX. Proceedings of SPIE. No.10708. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 107083F. ISBN 9781510619692. https://resolver.caltech.edu/CaltechAUTHORS:20190823-134013158

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Abstract

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.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.2311415DOIArticle
ORCID:
AuthorORCID
Bradford, C. M.0000-0001-5261-7094
Hunacek, Jonathon0000-0001-7066-226X
Bock, James0000-0002-5710-5212
Additional Information:© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE).
Group:Astronomy Department
Subject Keywords:millimeter wave, spectroscopy, diffraction grating, reionization, intensity mapping
Series Name:Proceedings of SPIE
Issue or Number:10708
Record Number:CaltechAUTHORS:20190823-134013158
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190823-134013158
Official Citation:Chao-Te Li, C. M. Bradford, Abigail Crites, Jonathon Hunacek, Tashun Wei, Jen-Chieh Cheng, Tzu-Ching Chang, and James Bock "TIME millimeter wave grating spectrometer", Proc. SPIE 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX, 107083F (9 July 2018); https://doi.org/10.1117/12.2311415
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98181
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:23 Aug 2019 21:39
Last Modified:09 Mar 2020 13:18

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