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Publication Citation: High resolution gamma-ray spectroscopy with a microwave-multiplexed TES array

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Author(s): Omid Noroozian; John A. Mates; Douglas A. Bennett; Justus A. Brevik; Joseph W. Fowler; Jiansong Gao; Robert D. Horansky; Kent D. Irwin; Daniel R. Schmidt; Joel N. Ullom; Zhao Kang;
Title: High resolution gamma-ray spectroscopy with a microwave-multiplexed TES array
Published: November 11, 2013
Abstract: We demonstrate the first gamma-ray spectroscopy with a microwave-multiplexed two-pixel TES(transition-edge sensor) array. We measured a $^{153}$Gd photon source and achieved an energy resolution of 63 eV full-width-at-half-maximum (FWHM) at 97 keV and an equivalent readout system noise of 86 pA/$\sqrt{\text{Hz}}$ at the TES. The readout circuit consists of superconducting microwave resonators coupled to rf SQUIDs and transduces changes in input current to changes in phase of a microwave signal. We use flux-ramp signal modulation to linearize the output in each channel. This demonstration establishes one path for the readout of cryogenic sensor arrays with more than 10$^{3}$ elements and spectral resolving powers $\lambda/\Δ\lambda > 10^{3}$.
Citation: Applied Physics Letters
Volume: 103
Issue: 20
Keywords: Microwave; multiplexing; SQUID; gamma ray; transition-edge sensor
Research Areas: Atomic Spectroscopy, Superconductivity, Sensors