Kavli Affiliate: James J. Bock
| First 5 Authors: Victoria L. Butler, Victoria L. Butler, , ,
| Summary:
Transition Edge Sensor (TES) bolometers are a well-established technology
with a strong track record in experimental cosmology, making them ideal for
current and future radio astronomy instruments. The Tomographic Ionized-carbon
Mapping Experiment (TIME), in collaboration with JPL, has developed advanced
silicon nitride leg isolated superconducting titanium detectors for 200 to 300
GHz observations of the Epoch of Reionization. Compared to their MHz
counterparts, bolometers operating in this frequency range are less common
because of their large absorber size and fragility. TIME aims to fabricate a
total of 1920 high frequency (HF) and low frequency (LF) detectors to fully
populate the focal plane. TIME has successfully developed HF (230 to 325 GHz)
and LF (183 to 230 GHz) wafers that are physically robust and perform well at
cryogenic temperatures (300 mK). Recent laboratory tests have shown high
optical efficiencies for the LF wafers (30 to 40%), but low device yield for
the HFs. To address this, new HF modules have been designed with improved
cabling and a reduced backshort distance, and are expected to perform similarly
to LFs in a similar lab setting. We report on the development of these
detectors as well as recent laboratory and on sky tests conducted at the
Arizona Radio Observatory’s (ARO) 12 meter prototype antenna at Kitt Peak
National Observatory.
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