1. High-resolution gamma-ray spectroscopy with a microwave-multiplexed transition-edge sensor array
- Author
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Daniel Schmidt, Joseph W. Fowler, Gene C. Hilton, Omid Noroozian, Zhao Kang, Joel N. Ullom, Kent D. Irwin, Robert D. Horansky, Jiansong Gao, Justus A. Brevik, John A. B. Mates, Leila R. Vale, and Douglas A. Bennett
- Subjects
Physics ,Physics - Instrumentation and Detectors ,Physics and Astronomy (miscellaneous) ,Physics::Instrumentation and Detectors ,business.industry ,FOS: Physical sciences ,Instrumentation and Detectors (physics.ins-det) ,Signal ,Noise (electronics) ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,Resonator ,Optics ,Modulation ,Gamma spectroscopy ,Transition edge sensor ,Astrophysics - Instrumentation and Methods for Astrophysics ,business ,Spectroscopy ,Instrumentation and Methods for Astrophysics (astro-ph.IM) ,Microwave - 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 $R=\lambda/\Delta\lambda > 10^3$., Comment: 5 pages, 5 figures, to be published in Applied Physics Letters, Vol 103, Issue 20, on 11-Nov-2013
- Published
- 2013