1. Simulation geometry 2000 V terminal Vacuum Glass substrate, ε = 5.8 Resistive coating, ε = 6.8 and σ = 1e-8 S/m The pore has a 40μ diameter and 40:1 aspect ratio Resistive coating is 1μ thick 2000 V terminals are 20μ thick Simulation is full scale 3D Single pore at this point cathode ground cutout

2. Electric field streamlines The voltage on the cathode is 2500V. MCP voltage is 2000V. Some field lines do not enter the pore. Edge effects Field alignment along the pore

3. Edge Effects in the pore

4. Color: |E|; Arrows & streamlines: Electric field 2000V

5. Yes, It is a 3D simulation