TIME millimeter wave grating spectrometer

Chao-Te Li; C. M. Bradford; Abigail Crites; Jonathon Hunacek; Tashun Wei; Jen-Chieh Cheng; Tzu-Ching Chang; James Bock

doi:10.1117/12.2311415

9 July 2018 TIME millimeter wave grating spectrometer

Chao-Te Li, C. M. Bradford, Abigail Crites, Jonathon Hunacek, Tashun Wei, Jen-Chieh Cheng, Tzu-Ching Chang, James Bock

Proceedings Volume 10708, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy IX; 107083F (2018) https://doi.org/10.1117/12.2311415
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

Citation Download 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

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