Study on electron emission suppression characteristic of molybdenum grid coated with Hf film by ion beam assisted deposition

Hf was deposited onto the surface of molybdenum grids by ion beam assisted deposition (IBAD). The electron emission characteristics from molybdenum grids with and without Hf, which were contaminated by active electron emission substances (Ba, BaO) of the cathode, were measured using an analogous diode method. The results show that electron emission from the grid coated with Hf film was less than that from molybdenum grid without Hf. The mechanism for electron emission suppression of the grids coated with Hf film was discussed.