Use of a Mylar filter to eliminate vacuum ultraviolet pulse pileup in low-energy x-ray measurements

We describe a method to reduce vacuum ultraviolet (VUV) pulse pileup (PPU) in x-ray pulse-height Silicon Drift Detector (SDD) signals. An Amptek FAST SDD, with C1 (Si3N4) window, measures bremsstrahlung emitted from PFRC-2 plasma to extract the electron temperature (Te) and density (ne). The C1 wind...

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Bibliographic Details
Published in:Review of scientific instruments 2022-09, Vol.93 (9), p.093531-093531
Main Authors: Galea, C. A., Swanson, C. P. S., Cohen, S. A., Thomas, S. J.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Bremsstrahlung
Electromagnetic radiation detectors
Electron energy
Electron energy distribution functions
Electronic shell
Energy
Interferometry
Mylar
Photons
Polyethylene terephthalate
Polymers
Soft x rays
Transmissivity
Vacuum tubes
Vacuum ultraviolet radiation
X ray tubes
X-ray spectroscopy
X-rays
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Summary:We describe a method to reduce vacuum ultraviolet (VUV) pulse pileup (PPU) in x-ray pulse-height Silicon Drift Detector (SDD) signals. An Amptek FAST SDD, with C1 (Si3N4) window, measures bremsstrahlung emitted from PFRC-2 plasma to extract the electron temperature (Te) and density (ne). The C1 window has low transmissivity for photons with energy below 200 eV though will transmit some VUV and soft x-ray photons, which PFRC-2 plasmas abundantly emit. Multi-VUV-photon PPU contaminates the interpretation of x rays with energy > 100 eV, particularly in a low-energy exponential tail. The predicted low transmissivity of ∼1 μm thick Mylar [polyethylene terephthalate (PET)] to photons of energy
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0101712