Cd plate and gold foil.
The thickness of Cd plate and gold foil are 0.5mm and 0.01mm, respectively.
The gold foil is put between Cd plates.

gold foil with Cd fillter

The plug of foil slot and gold foil with Cd fillter

Foil slot. The plug is inserted the hole.

After insert the plug

Central experimental hole of the C-pile. The block with the foil slots is inserted to the center of the hole.

The other carbon block to fill the central experimental hole.

After insert the blocks