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280 GHz Focal Plane Unit Design and Characterization for the SPIDER-2 Suborbital Polarimeter
A. S. Bergman, P. A. R. Ade, S. Akers +76
We describe the construction and characterization of the 280 GHz bolometric focal plane units (FPUs) to be deployed on the second flight of the balloon-borne SPIDER instrument. The…
Superconducting micro-resonator arrays with ideal frequency spacing and extremely low frequency collision rate
X. Liu, W. Guo, Y. Wang +10
We present a wafer trimming technique for producing superconducting micro-resonator arrays with highly uniform frequency spacing. With the light-emitting diode (LED) mapper techniq…
Microstructure analysis of bismuth absorbers for transition-edge sensor X-ray microcalorimeters
Daikang Yan, Ralu Divan, Lisa M. Gades +16
Transition-edge sensors (TESs) as microcalorimeters offer high resolving power, owning to their sharp response and low operating temperature. In the hard X-ray regime and above, th…
Characterization of the Mid-Frequency Arrays for Advanced ACTPol
Steve K. Choi, Jason Austermann, James A. Beall +17
The Advanced ACTPol upgrade on the Atacama Cosmology Telescope aims to improve the measurement of the cosmic microwave background anisotropies and polarization, using four new dich…
Microwave SQUID Multiplexer demonstration for Cosmic Microwave Background Imagers
B. Dober, D. T. Becker, D. A. Bennett +10
Key performance characteristics are demonstrated for the microwave SQUID multiplexer (MUX) coupled to transition edge sensor (TES) bolometers that have been optimized for cosmic…
Eliminating the non-Gaussian spectral response of X-ray absorbers for transition-edge sensors
Daikang Yan, Ralu Divan, Lisa M. Gades +16
Transition-edge sensors (TES) as microcalorimeters for high-energy-resolution X-ray spectroscopy are often fabricated with an absorber made of materials with high Z (for X-ray stop…
L-Edge Spectroscopy of Dilute, Radiation-Sensitive Systems Using a Transition-Edge-Sensor Array
Charles J. Titus, Michael L. Baker, Sang Jun Lee +24
We present X-ray absorption spectroscopy and resonant inelastic X-ray scattering (RIXS) measurements on the iron L-edge of 0.5 mM aqueous ferricyanide. These measurements demonstra…
Broadband parametric amplifiers based on nonlinear kinetic inductance artificial transmission lines
Saptarshi Chaudhuri, Dale Li, Kent Irwin +5
We present broadband parametric amplifiers based on the kinetic inductance of superconducting NbTiN thin films in an artificial (lumped-element) transmission line architecture. We…
Counting Near Infrared Photons with Microwave Kinetic Inductance Detectors
W. Guo, X. Liu, Y. Wang +8
We demonstrate photon counting at 1550 nm wavelength using microwave kinetic inductance detectors (MKIDs) made from TiN/Ti/TiN trilayer films with superconducting transition temper…
A Reassessment of Absolute Energies of the X-ray L Lines of Lanthanide Metals
J. W. Fowler, B. K. Alpert, D. A. Bennett +12
We introduce a new technique for determining x-ray fluorescence line energies and widths, and we present measurements made with this technique of 22 x-ray L lines from lanthanide-s…