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Evaluation of x-ray transmission photocathode detection issues in the energy range of 8-30 keV
Author(s): Sabrina R. Nagel; Clément A. Trosseille; Andrew MacPhee; Mai S. Beach; Donald C. Benson; Arthur C. Carpenter; Matthew S. Dayton; Kyle C. Engelhorn; Emily R. Hurd; Nobuhiko Izumi
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Paper Abstract

At the National-Ignition-Facility (NIF) and other laser facilities, X-ray transmission photocathodes are used in streak cameras and pulse-dilation framing cameras with temporal resolution well below 100 ps. For X-ray imaging quality assurance, signal-to-noise ratios of at least a couple, and optimally higher, have to be achieved. The signal-to-noise ratio depends on the photon influence and the Detective Quantum Efficiency (DQE). X-ray photocathodes are notoriously noisy, since they have large pulse height distributions, and their DQE is both material and photon-energy dependent. Furthermore, for high temporal resolution, in pulse dilation instruments space charge effects may further limit the achievable signal-to-noise ratio. Here, we look into details on what to consider when choosing photocathode materials to optimize the achievable signal-to-noise and touch on further potential improvements using structured photocathodes.

Paper Details

Date Published: 9 September 2019
PDF: 10 pages
Proc. SPIE 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI, 1111416 (9 September 2019); doi: 10.1117/12.2529399
Show Author Affiliations
Sabrina R. Nagel, Lawrence Livermore National Lab. (United States)
Clément A. Trosseille, Lawrence Livermore National Lab. (United States)
Andrew MacPhee, Lawrence Livermore National Lab. (United States)
Mai S. Beach, Lawrence Livermore National Lab. (United States)
Donald C. Benson, Lawrence Livermore National Lab. (United States)
Arthur C. Carpenter, Lawrence Livermore National Lab. (United States)
Matthew S. Dayton, Lawrence Livermore National Lab. (United States)
Kyle C. Engelhorn, General Atomics (United States)
Emily R. Hurd, Lawrence Livermore National Lab. (United States)
Nobuhiko Izumi, Lawrence Livermore National 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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