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Final gapvoltages

Transit-time spread of MCPs in the 8" chamber, plotted as a function of the key operational voltages: across the gap between the photocathode and top of the first MCP (green circles), between the two MCPs (red triangles), and between the bottom of the second MCP and anode (blue squares). Timing for all gap voltages is preferred to be above 200 V, and performance is most sensitive to the photocathode and inter-MCP gaps.