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9 September 2019 Evaluation of x-ray transmission photocathode detection issues in the energy range of 8-30 keV
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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Proceedings Volume 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI; 1111416 (2019) https://doi.org/10.1117/12.2529399
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States
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.
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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, and Nobuhiko Izumi "Evaluation of x-ray transmission photocathode detection issues in the energy range of 8-30 keV", Proc. SPIE 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI, 1111416 (9 September 2019); https://doi.org/10.1117/12.2529399
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KEYWORDS
Signal to noise ratio
Quantum efficiency
X-rays
X-ray detectors
Temporal resolution
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