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Eliminating the non-Gaussian spectral response of X-ray absorbers for transition-edge sensors

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/1.5001198· OSTI ID:1412693

Transition-edge sensors (TESs) as microcalorimeters for high-energy-resolution X-ray spectroscopy are often fabricated with an absorber made of materials with high Z (for X-ray stopping power) and low heat capacity (for high resolving power). Bismuth represents one of the most compelling options. TESs with evaporated bismuth absorbers have shown spectra with undesirable and unexplained low-energy tails. We have developed TESs with electroplated bismuth absorbers over a gold layer that are not afflicted by this problem and that retain the other positive aspects of this material. To better understand these phenomena, we have studied a series of TESs with gold, gold/evaporated bismuth, and gold/electroplated bismuth absorbers, fabricated on the same die with identical thermal coupling. Lastly, we show that the bismuth morphology is linked to the spectral response of X-ray TES microcalorimeters.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1412693
Alternate ID(s):
OSTI ID: 1408056
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 19 Vol. 111; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

A Transition-edge Sensor-based X-ray Spectrometer for the Study of Highly Charged Ions at the National Institute of Standards and Technology Electron Beam Ion Trap text January 2020
Heavy ion induced Ti X-ray satellite structure for Ti, TiN, and TiO 2 thin films journal September 2018
Characterization of High Aspect-Ratio TiAu TES X-ray Microcalorimeter Array Under AC Bias journal November 2019
On Low-Energy Tail Distortions in the Detector Response Function of X-Ray Microcalorimeter Spectrometers journal November 2019
A transition-edge sensor-based x-ray spectrometer for the study of highly charged ions at the National Institute of Standards and Technology electron beam ion trap journal December 2019
Soft X-ray spectroscopy with transition-edge sensors at Stanford Synchrotron Radiation Lightsource beamline 10-1 journal November 2019

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