JOHN A.B. MATES, University of Colarado, Boulder, CO, USA: Highly sensitive superconducting Transition-Edge Sensor (TES) arrays enable a wide range of science but require a superconducting multiplexer to avoid excess heat load and wiring complexity. Existing multiplexing techniques cannot provide the bandwidth necessary for new arrays of thousands of high-bandwidth detectors. The Microwave SQUID Multiplexer meets this need using a single cryogenic amplifier and a pair of coaxial cables to distribute GHz of bandwidth between the input channels. The Microwave SQUID Multiplexer combines dissipationless rfSQUIDs and superconducting microwave resonators, encoding the signal from each input channel in its own microwave tone, summing many tones onto a common output channel. The large (4 GHz) output bandwidth allows the multiplexed readout of large numbers of conventional detectors, but also of faster detectors than could be multiplexed before. For high-bandwidth applications such as the HOLMES neutrino mass experiment and x-ray beamline science we present a new Microwave SQUID Multiplexer design. This device targets an effective per-pixel sampling rate of 1 MHz and a multiplexing factor of 256 pixels per cryogenic amplifier, far exceeding existing technologies and enabling new measurements.

DATA: 21-06-2016