Measurement of cathode luminescence efficiency of phosphors for micro-channel plate based x-ray framing cameras

N. Izumi; J. Emig; J. Moody; C. Middeleton; J. Holder; S. Glenn; T. Pond; R. Shellman; M. Cardenas; P. J. Walsh; S. J. Chelli; D. K. Bradley; P. M. Bell

doi:10.1117/12.930992

15 October 2012 Measurement of cathode luminescence efficiency of phosphors for micro-channel plate based x-ray framing cameras

N. Izumi, J. Emig, J. Moody, C. Middeleton, J. Holder, S. Glenn, T. Pond, R. Shellman, M. Cardenas, P. J. Walsh, S. J. Chelli, D. K. Bradley, P. M. Bell

Author Affiliations +

Proceedings Volume 8505, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion; 85050I (2012) https://doi.org/10.1117/12.930992
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

From a point of a signal-to-background ratio, phosphors are a key component of micro channel plate (MCP) based x-ray framing cameras. In an MCP based framing camera, x-ray signal is converted to electrons, gated, amplified, and converted back to optical signal on the phosphor. To operate x-ray framing cameras in a harsh neutron induced radiation background of the National Ignition Facility, cathodeluminescence efficiency of the phosphor is very important. To avoid MCP damage due to high voltage breakdown, we have been operating phosphors below 3kV (acceleration field < 6 kV/mm). The signal-to-background ratio the camera can be significantly improved by increasing the phosphor potential to 10kV. We measured conversion efficiencies of standard phosphors at electron energies of 0.5 ~10 keV and assessed achievable performance of them with using a numerical model.

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N. Izumi, J. Emig, J. Moody, C. Middeleton, J. Holder, S. Glenn, T. Pond, R. Shellman, M. Cardenas, P. J. Walsh, S. J. Chelli, D. K. Bradley, and P. M. Bell "Measurement of cathode luminescence efficiency of phosphors for micro-channel plate based x-ray framing cameras", Proc. SPIE 8505, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion, 85050I (15 October 2012); https://doi.org/10.1117/12.930992

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