NDLI: X-Ray Spectral Confirmation of Electron Reflexing in a 300-kV Reflex Triode

Content Provider	IEEE Xplore Digital Library
Author	Riordan, J.C. Niansheng Qi Lojewski, D.Y.
Copyright Year	2005
Description	Author affiliation: Div. of Pulse Sci., Titan, San Leandro, CA (Riordan, J.C.; Niansheng Qi)
Abstract	Summary form only given. Differential absorption spectrometers (DAS) are commonly used to measure the X-ray spectrum generated from high-current, relativistic electron beam diodes. We have previously presented a novel parametric spectral unfold technique that overcomes the problems typically observed with conventional DAS unfold approaches. In particular, the solution spectrum is independent of the choice of trial spectrum and it contains no unphysical peaks; the endpoint energy is also determined self-consistently, not a priori. In this paper we present parametric-unfold spectra obtained for a 300-kV reflex triode using the new low-energy differential absorption spectrometer (LEDAS). The LEDAS is designed for endpoints up to 500 keV, and uses ten filters with four TLDs per filter as detectors. The unfolded spectrum gave a minimized rms error of ap4% between the calculated and measured LEDAS doses. The unfolded endpoints were slightly less than, but strongly correlated with, the measured peak voltages. We also calculated two theoretical spectra for the 300-kV reflex triode using TIGERP with an input electron energy distribution calculated from the measured triode current and voltage waveforms. Boundary conditions at the converter surfaces either reflected the electrons ("reflexing") or allowed them to escape ("non-reflexing"). We then scaled the two spectra to minimize the LEDAS rms error; the errors were dominated by excess theoretical dose in the most heavily filtered (highest energy) channel. The shapes of the unfolded spectrum and the two scaled theoretical spectra showed excellent agreement below 100 keV, but the non-reflexing theoretical spectrum showed a pronounced excess at higher photon energies. The unfolded spectrum was only slightly below the theoretical reflexing spectrum near the endpoint, which might be explained by electrons losing energy in a low-Z anode plasma before striking the tantalum converter. Thus, the electrons in the 300-kV reflex triode appear to be reflexing as expected
Sponsorship	Plasma Sci. Appl. Comm. IEEE Nucl. Plasma Sci. Soc.
Starting Page	169
Ending Page	169
File Size	1330145
Page Count	1
File Format	PDF
ISBN	0780393007
ISSN	07309244
DOI	10.1109/PLASMA.2005.359177
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spectroscopy Filters Voltage Electromagnetic wave absorption Electron beams Diodes Detectors Current measurement Energy measurement Boundary conditions
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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