Figure 5
Potentials along the nodes of the (a) 1/r compound-lens design and (b) Nelder–Mead optimized design. Node 0 corresponds to copper mesh at the entry of the compound lens, nodes 1–25 correspond to the 25 blades, and node 26 corresponds to the copper mesh at the end of the compound lens. The voltages plotted here are for a starting potential of 0 V and a final potential of −500 V, or 500 V of electron retardation. The voltage profile scales linearly with desired retardation value. |