Charge-Control Mesh-Screen

This mesh is made of Nickel metal and is ~90% transparent to electrons.  The mesh itself has Electro-Formed wires that are ~20 microns in diameter.  The square hole is roughly 200×200 microns in size.  It is available from Goodfellow USA.  (see Goodfellow information below.)The mesh is sitting on a 3 cm x 3 cm square of aluminum metal. The mesh-screen is sitting  < 1 mm above the surface of the sample.  The mesh is held down using aluminum tape. The holes can be used to trap the mesh-screen with screws.  The mesh screen needs to be connected to ground.   If you use a magnetic lens, then you should use a non-magnetic metal, not Nickel.  (Nickel works, but it moves up and down.)  If your X-ray beam is small, then the mesh needs to be closer to the sample, maybe ~0.5 mm.  If the mesh touches the sample, you will see the Nickel signal in your survey spectrum, but not your chemical state spectra.

~90% Transmission Wire-mesh (Electro-Formed)

Wire diameter:  ~20 micron
Square mesh hole:  ~200 x 200 micron (0.2 x 0.2 mm)