skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Observation of multipath effects in the detection of RF-modulated x-rays

Abstract

As part of the Air Force Research Laboratory’s ongoing research in particle accelerators and beams, we recently began investigating the interaction of RF-modulated x-ray beams with RF structures. Additionally, these bremsstrahlung x-rays, produced using an S-band RF electron linac and tungsten foil, were able to drive RF signals at the linac frequency and its integer harmonics in an S-band waveguide. This was interpreted as a result of secondary electron production inside the waveguide by the modulated x-ray beam and implied that the primary electron beam RF modulation was preserved, to at least some degree, through both the processes of x-ray and secondary electron production. The strength of these signals induced on the waveguide varied as the distance of the waveguide from the tungsten foil changed, with the nature of these changes suggesting the existence of an interference process resulting from multipath propagation of the modulated x-rays. Here, we report on our initial attempt to verify this multipath propagation by altering the configuration of shielding and reflective masses in the environment of the waveguide. Finally, these measurements support the existence of a multipath propagation effect and further indicate that the RF modulation of the x-rays is preserved as they undergo scatteringmore » events inside the accelerator vault.« less

Authors:
 [1];  [2];  [3]; ORCiD logo [4]
  1. Air Force Research Laboratory, Albuquerque, NM (United States)
  2. EBM, LLC, Albuquerque, NM (United States)
  3. Raytheon Missile Systems, Albuquerque, NM (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE; U.S. Air Force
OSTI Identifier:
1544680
Report Number(s):
LA-UR-18-27617
Journal ID: ISSN 0021-8979
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 124; Journal Issue: 17; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; Accelerator Design, Technology, and Operations

Citation Formats

Harris, John R., Miller, R. B., McChesney, P. D., and Lewellen, John W. IV. Observation of multipath effects in the detection of RF-modulated x-rays. United States: N. p., 2018. Web. doi:10.1063/1.5052369.
Harris, John R., Miller, R. B., McChesney, P. D., & Lewellen, John W. IV. Observation of multipath effects in the detection of RF-modulated x-rays. United States. doi:10.1063/1.5052369.
Harris, John R., Miller, R. B., McChesney, P. D., and Lewellen, John W. IV. Thu . "Observation of multipath effects in the detection of RF-modulated x-rays". United States. doi:10.1063/1.5052369.
@article{osti_1544680,
title = {Observation of multipath effects in the detection of RF-modulated x-rays},
author = {Harris, John R. and Miller, R. B. and McChesney, P. D. and Lewellen, John W. IV},
abstractNote = {As part of the Air Force Research Laboratory’s ongoing research in particle accelerators and beams, we recently began investigating the interaction of RF-modulated x-ray beams with RF structures. Additionally, these bremsstrahlung x-rays, produced using an S-band RF electron linac and tungsten foil, were able to drive RF signals at the linac frequency and its integer harmonics in an S-band waveguide. This was interpreted as a result of secondary electron production inside the waveguide by the modulated x-ray beam and implied that the primary electron beam RF modulation was preserved, to at least some degree, through both the processes of x-ray and secondary electron production. The strength of these signals induced on the waveguide varied as the distance of the waveguide from the tungsten foil changed, with the nature of these changes suggesting the existence of an interference process resulting from multipath propagation of the modulated x-rays. Here, we report on our initial attempt to verify this multipath propagation by altering the configuration of shielding and reflective masses in the environment of the waveguide. Finally, these measurements support the existence of a multipath propagation effect and further indicate that the RF modulation of the x-rays is preserved as they undergo scattering events inside the accelerator vault.},
doi = {10.1063/1.5052369},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 124,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 1, 2019
Publisher's Version of Record

Save / Share: