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 (+3 others)
2012 Target Diagnostics Physics and Engineering for Inertial Confinement Fusion  
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
more » ... 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.
doi:10.1117/12.930992 fatcat:nazktzlhkbfc3abhvw66keoa3a