A few nice edm wire images I found:
Tight trap, parts
Image by fatllama
Group member Simon Webster has been designing a new linear ion trap to replace an old experiment. This version features a brass mounting structure instead of ceramic, which won’t work at all, but can survive various forms of abuse: dropping, prodding with metal tools, and being used as a jig for bending and assembling wires to be used as compensation electrodes.
A brass/steel mockup is shown here. A closeup of the trapping region is here.
The parts were made by Simon Moulder and the rest of the Motorcycle club at the Clarendon workshop using wire-erosion EDM. The blades and endcaps are stainless steel, the insulators are Macor ceramic.