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Use of a Mylar filter to eliminate vacuum ultraviolet pulse pileup in low-energy x-ray measurements.
- Source :
- Review of Scientific Instruments; 9/1/2022, Vol. 93 Issue 9, p1-5, 5p
- Publication Year :
- 2022
-
Abstract
- 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 (Si<subscript>3</subscript>N<subscript>4</subscript>) window, measures bremsstrahlung emitted from PFRC-2 plasma to extract the electron temperature (T<subscript>e</subscript>) and density (n<subscript>e</subscript>). 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 < 100 eV led to the selection of Mylar as the candidate filter to reduce VUV PPU. Experiments were conducted on an x-ray tube with a graphite target and on a quasi-Maxwellian tenuous plasma (n<subscript>e</subscript> ∼ 10<superscript>9</superscript> cm<superscript>−3</superscript>) with effective temperatures reaching 1500 eV. A Mylar filter thickness of 850 nm is consistent with the results. The Mylar-filter-equipped SDD was then used on the PFRC-2 plasma, showing a substantial reduction in the low-energy x-ray signal, supporting our hypothesis of the importance of VUV PPU. We describe the modeling and experiments performed to characterize the effect of the Mylar filter on SDD measurements. [ABSTRACT FROM AUTHOR]
- Subjects :
- X-rays
SILICON detectors
POLYETHYLENE terephthalate
SOFT X rays
ELECTRON temperature
Subjects
Details
- Language :
- English
- ISSN :
- 00346748
- Volume :
- 93
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Review of Scientific Instruments
- Publication Type :
- Academic Journal
- Accession number :
- 159444284
- Full Text :
- https://doi.org/10.1063/5.0101712