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 to 9). 60 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 x 3 mm silicon nitride micro-mesh suspended near the corners by 1 x 1 x 500 µm silicon nitride legs targeting a photon-noise-dominated NEP ∼ 1 × 10 −17 W/ √ Hz. Hafnium films are explored as a lower-T c alternative to Ti (500 mK) for TIME TESs, allowing thicker support legs for improved yield. Hf T c is shown to vary between 250 mK 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 × 10 7 .
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