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The Cosmology Large Angular Scale Surveyor (CLASS) is apolarization-sensitive telescope array located at an altitude of 5,200 m in theChilean Atacama Desert. CLASS is designed to measure "E-mode" (even parity) and"B-mode" (odd parity) polarization patterns in the Cosmic Microwave Background(CMB) over large angular scales with the aim of improving our understanding ofinflation, reionization, and dark matter. CLASS is currently observing withthree telescopes covering four frequency bands: one at 40 GHz (Q); one at 90GHz (W1); and one dichroic system at 150/220 GHz (G). In these proceedings, wediscuss the updated design and in-lab characterization of new 90 GHz detectors.The new detectors include design changes to the transition-edge sensor (TES)bolometer architecture, which aim to improve stability and optical efficiency.We assembled and tested four new detector wafers, to replace four modules ofthe W1 focal plane. These detectors were installed into the W1 telescope, andwill achieve first light in the austral winter of 2022. We presentelectrothermal parameters and bandpass measurements from in-lab dark andoptical testing. From in-lab dark tests, we also measure a median NEP of 12.3$\mathrm{aW\sqrt{s}}$ across all four wafers about the CLASS signal band, whichis below the expected photon NEP of 32 $\mathrm{aW\sqrt{s}}$ from the field. Wetherefore expect the new detectors to be photon noise limited.

Design and characterization of new 90 GHz detectors for the Cosmology Large Angular Scale Surveyor (CLASS)