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Digital time-resolved spot diagnostic
Author(s): Logan Fegenbush; Matthew Martin; Zak Fitzpatrick; Santiago Olguin; Sheridan Smith; Jim Mirador; Stuart Baker; Brandon Baldonado; Darryl Droemer; Michael Berninger; Morris Kaufman; Duane Smalley; Jacob Zier
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Paper Abstract

The digital time-resolved spot diagnostic (D-TRSD) is intended to be a fast-response, time-dependent beam diagnostic for measuring the spot size emitted from radiographic x-ray sources. It will measure spot sizes from submillimeters up to several millimeters for photon energies in the range of 150 keV to 20 MeV with doses as low as 0.03 rad up to 500 rad. The D-TRSD performs fast data acquisition as radiographic x-ray sources typically produce pulses in the tens of nanosecond ranges. The system will be optimized to capture multiple individual pulses in time within the same data record. The data collected will be used to support beam tuning and source optimization with on-the-fly evaluation of radiographic source performance. The diagnostic is based on penumbral imaging techniques. A scintillating fiber array of parallel aligned fibers is positioned in the beam path with a high-Z rolled edge inserted between the source and the array, thereby creating the penumbral x-ray signal that is captured by the D-TRSD system. The light from the scintillation conversion is recorded by individual avalanche photodiode detectors integrated into custom digitizer electronics. The penumbra is used to calculate the spot of the beam on the axis orthogonal to the fiber array based on the magnification from the rolled edge, the resolution of the spaced fibers, and the rotation of the array normal to the beam path. Many arrays can be used to capture additional spot widths about different rotations. The D-TRSD system is modular, software-driven, and easier to use than legacy TRSD systems.

Paper Details

Date Published: 9 September 2019
PDF: 9 pages
Proc. SPIE 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI, 111141M (9 September 2019); doi: 10.1117/12.2528451
Show Author Affiliations
Logan Fegenbush, Nevada National Security Site (United States)
Matthew Martin, Nevada National Security Site (United States)
Zak Fitzpatrick, Nevada National Security Site (United States)
Santiago Olguin, Nevada National Security Site (United States)
Sheridan Smith, Nevada National Security Site (United States)
Jim Mirador, Nevada National Security Site (United States)
Stuart Baker, Nevada National Security Site (United States)
Brandon Baldonado, Nevada National Security Site (United States)
Darryl Droemer, Nevada National Security Site (United States)
Michael Berninger, Nevada National Security Site (United States)
Morris Kaufman, Nevada National Security Site (United States)
Duane Smalley, Nevada National Security Site (United States)
Jacob Zier, U.S. Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 11114:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI
Ralph B. James; Arnold Burger; Stephen A. Payne, Editor(s)

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