Geant4 modeling of a filtered scintillator array for the development of a rep-rated beam calorimeter

Next-generation laser facilities used to study high-energy-density (HED) physics are now moving towards rep-rated operation (~0.1-10Hz). Many of the diagnostics presently in-use rely on single-use media, such as film or image plates (IPs), that require the vacuum to be broken and diagnostic media exchanged before each shot. One of the most prevalent diagnostics used in developing laser-driven radiation sources is a filtered stack of IPs, wherein each IP has a different low-energy threshold for particles of interest (e.g., electrons, photons, or protons). In general, this diagnostic can provide an energy spectrum and energy-resolved beam size information. However, to rep-rate this filtered stack of detectors, the IPs must be exchanged for a media that can be immediately digitized and read out at rep-rates of up to 10Hz; scintillators are one potential option for this application. To this end, a Geant4 model has been developed to study different filter and scintillator configurations to determine sensitivity curves to aid in designing future diagnostics for rep-rated experiments. Results from recent calculations will be presented and discussed.