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arXiv · 1310.7287

High-resolution gamma-ray spectroscopy with a microwave-multiplexed transition-edge sensor array

Omid Noroozian·John A. B. Mates·Douglas A. Bennett·Justus A. Brevik·Joseph W. Fowler·Jiansong Gao·Gene C. Hilton·Robert D. Horansky·Kent D. Irwin·Zhao Kang·Daniel R. Schmidt·Leila R. Vale·Joel N. Ullom
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Abstract

We demonstrate very high resolution photon spectroscopy with a microwave-multiplexed two-pixel transition-edge sensor (TES) array. We measured a $^{153}$Gd photon source and achieved an energy resolution of 63 eV full-width-at-half-maximum 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 radio-frequency superconducting-quantum-interference-devices (SQUID) and transduces changes in input current to changes in phase of a microwave signal. We use flux-ramp modulation to linearize the response and evade low-frequency noise. This demonstration establishes one path for the readout of cryogenic X-ray and gamma-ray sensor arrays with more than $10^3$ elements and spectral resolving powers $R=\lambda/\Delta\lambda > 10^3$.

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Omid Noroozian, John A. B. Mates, Douglas A. Bennett, Justus A. Brevik, Joseph W. Fowler, Jiansong Gao, Gene C. Hilton, Robert D. Horansky, Kent D. Irwin, Zhao Kang, Daniel R. Schmidt, Leila R. Vale, Joel N. Ullom. 2013-10-28. High-resolution gamma-ray spectroscopy with a microwave-multiplexed transition-edge sensor array. https://doi.org/10.1063/1.4829156

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