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Cosmic Ray Susceptibility of the Terahertz Intensity Mapper Detector Arrays
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Cosmic Ray Susceptibility of the Terahertz Intensity Mapper Detector Arrays
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Journal Article
Cosmic Ray Susceptibility of the Terahertz Intensity Mapper Detector Arrays
2024
Overview
We report on the effects of cosmic ray interactions with the kinetic inductance detector (KID)-based focal plane array for the terahertz intensity mapper (TIM). TIM is a NASA-funded balloon-borne experiment designed to probe the peak of the star formation in the Universe. It employs two spectroscopic bands, each equipped with a focal plane of four
∼
900-pixel, KID-based array chips. Measurements of an 864-pixel TIM array show 791 resonators in a 0.5 GHz bandwidth. We discuss challenges with resonator calibration caused by this high multiplexing density. We robustly identify the physical positions of 788 (99.6 %) detectors using a custom LED-based identification scheme. Using this information, we show that cosmic ray events occur at a rate of 2.1
events
/
min
/
cm
2
in our array. 66 % of the events affect a single pixel, and other 33 % affect
<
5 KIDs per event spread over a 0.66
cm
2
region (2 pixel pitches in radius). We observe a total cosmic ray dead fraction of 0.0011 % and predict that the maximum possible in-flight dead fraction is
∼
0.124 %, which demonstrates our design will be robust against these high-energy events.
