Effects of mosaicity on parametric x-radiation production
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Authors
Buckingham, William Morgan
Ivey, Lisa Renee
Subjects
NA
Advisors
Maruyama, Xavier K.
Date of Issue
1994-12
Date
December 1994
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
Previous measurements of parametric x-radiation (PXR) spectra from mosaic graphite observed yields that greatly exceeded theoretical predictions. At the Bragg scattering condition, the interaction of relativistically charged particles and the atomic planes of a crystal produces scattering of virtual photons. This is known as PXR. The discrepancies between actual yields and theoretical predictions might possibly have been caused by the mosaic spread of the atomic planes of the crystal. Re-analysis of previous data has shown a miscalculation of the effective target thickness used in earlier work. There was also an error in the calculation of the theory that was used for comparison. Correction of the two errors brought the data and theory in closer agreement, but the mosaic spread does change the intensity of the PXR. In this thesis, three samples of thick mosaic carbon graphite crystal with differing mosaic spreads are compared to determine the effect of the mosaicity on PXR yield. By obtaining "rocking curves" where the target orientation angle is changed with respect to the incident electron beam and observation angle, it was found that the mosaic spread does have an effect on the PXR spectral distribution. This effect is quite significant and can be seen when viewing the "rocking curves" of the samples. As the mosaicity increased, the angular distribution was spread out and the coherence condition was relaxed.
Type
Thesis
Description
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
78 p.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.