thermionics laboratory, inc
3kW Rod fed e-gun manual Page 4
OPERATION
CRUCIBLE PREPARATION
Cleanliness is critical for high quality films and trouble free operation. CLEAN the crucible
thoroughly before each new material is used. Heavy buildup of the previous material on
the crucible can cause contamination of the melt. The crucible should be cleaned with an
abrasive pad (“scotch bright”) and then vacuumed out. It should then be wiped out with
acetone and alcohol. Cleaning by glass bead blasting is another alternative. When using
a glass bead blaster make sure to keep the air pressure at 40psi. The source should be
disassembled prior to glass bead blasting and special attention should be given to
removal of all glass from the parts after cleaning (glass is a dielectric material and will
cause severe arcing if left on the source). Inspect the crucible bore and ensure that it is
clear of any material that may prevent advancement of the material rod.
CHOOSING EVAPORATION MATERIAL
Material for evaporation comes in a variety of forms and purities. Typically the process
will determine purity. The Rod fed eGun requires material in a rod form. This material
form is readily available and allows you to advance the material as the material is
evaporated. Recommended sizes: RCRF-0325: 0.245 +0.000”/-0.005”; RCRF-0338:
0.374 +0.000”/-0,005”
LOADING THE CRUCIBLE
Running the e-Gun with
an empty crucible will destroy the source
. Insert the rod into
the crucible and slide it until it seats in the coupling on the linear feedthrough. Retract the
rod until 2-3 mm is left showing above the crucible.
