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- Title
Hafnium Films and Magnetic Shielding for TIME, A mm-Wavelength Spectrometer Array.
- Authors
Hunacek, J.; Bock, J.; Bradford, C. M.; Butler, V.; Chang, T.-C.; Cheng, Y.-T.; Cooray, A.; Crites, A.; Frez, C.; Hailey-Dunsheath, S.; Hoscheit, B.; Kim, D. W.; Li, C.-T.; Marrone, D.; Moncelsi, L.; Shirokoff, E.; Steinbach, B.; Sun, G.; Trumper, I.; Turner, A.
- Abstract
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∼ 5-9). Sixty 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 × 3 mm silicon nitride micro-mesh suspended near the corners by 1 × 1 × 500 μm silicon nitride legs targeting a photon-noise-dominated NEP ∼1×10-17W/Hz. Hafnium films are explored as a lower-Tc alternative to Ti (500 mK) for TIME TESs, allowing thicker support legs for improved yield. Hf Tc is shown to vary between 250 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 5×107.
- Subjects
HAFNIUM; METALLIC films; MAGNETIC shielding; WAVELENGTHS; SPECTROMETERS; BOLOMETERS
- Publication
Journal of Low Temperature Physics, 2018, Vol 193, Issue 5/6, p893
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-018-1906-3