Hi Ahsan Rizvi , whilst I have no direct experience of Molybdenum e-beam evaporation I have performed Nb e-beam deposition to create superconducting thin films. My evaporator included a water-cooled Cu hearth and electrostatic focussing. During my time we made a couple of modifications which greatly improved our deposition process. Firstly, we fabricated Cu inserts for the Cu hearth with a conical internal profile, and secondly, we installed the e-gun vertically so that with the conical insert we always had an aligned molten ball of Nb with the focussed e-beam. With this I was able to use nearly all of the Nb pellet over many depositions runs with miniaml variation in deposition rates.

I hope this might be helpful.

Best regards,

Martin