Electron Spectroscopy using Transition-Edge Sensors
arxiv(2024)
Abstract
Transition-edge sensors (TESs) have the potential to perform electron
spectroscopic measurements with far greater measurement rates and efficiencies
than can be achieved using existing electron spectrometers. Existing
spectrometers filter electrons by energy before detecting a narrow energy band
at a time, discarding the vast majority of electrons available for measurement.
In contrast, transition-edge sensors (TES) have intrinsic energy sensitivity
and so do not require prior filtering to perform energy-resolved measurements.
Despite this fundamental advantage, TES electron spectroscopy has not, to our
knowledge, previously been reported in the literature. We present the results
of a set of proof-of-principle experiments demonstrating TES electron
spectroscopy experiments using Mo/Au TESs repurposed for electron calorimetry.
Using these detectors, we successfully measured the electron spectrum generated
by an electron beam striking a graphite target with energies between 750 and
2000 eV, at a noise-limited energy resolution of 4 eV. Based on the findings of
these experiments, we suggest improvements that could be made to TES design to
enhance their electron detection capabilities through the use of of a dedicated
electron absorber in the device with integrated electron optics.
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