Higher Order Parametric X-Rays
Abstract
Parametric x-radiation (PXR) may be described as the Bragg scattering of virtual photons to produce real x-rays which satisfy the Bragg condition dsin = n, where is the angle between the electron beam direction and a crystal axis. Enhanced higher order parametric x-radiation from the 10021 plane of a mosaic graphite crystal has been observed. Production of PXR of the order n=2 exceed that from the first order, and x-rays of order up to n=6 are readily seen. The production of higher order x-radiation is obtained by using a thick crystal where the formation and attenuation lengths are exploited to enhance higher energy x-ray formation relative to the lower energy first order x-radiation. Photons of energy 5 to 30 KeV have been measured. The experiment was conducted with a 90 MeV electron beam from the Naval Postgraduate School electron linear accelerator. A three axis target position program, Easy-Mover, was developed to allow for precision orientation of the crystal axis with respect to the electron beam.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1991
- Accession Number
- ADA247148
Entities
People
- Michael J. Osborne
Organizations
- Naval Postgraduate School