  The vacuum chamber of accelerator storage ring need clean ultra-high vacuum
environment. TiZrV getter film which was deposited on interior wall of vacuum
chamber, can realize distributed pumping, effectively improve the vacuum degree
and reduce the longitudinal gradient. But accumulation of pollutants such as
N2, O2, will decrease the adsorption ability of non-evaporable getter (NEG),
which leads to the reduction of NEG lifetime. Therefore, NEG thin film coated
with a layer of Pd which has high diffusion rate and absorption ability for H2,
can extend the service life of NEG, and improve the pumping rate of H2 at the
same time. With argon as discharge gas, magnetron sputtering method was adopted
to prepare TiZrV-Pd film in long straight pipe. According to the experimental
results of the scanning electron microscope (SEM), deposition rates of TiZrV-Pd
films were analyzed under different deposition parameters, the magnetic field
strength, the gas flow rate, discharge current, discharge voltage and working
pressure. Moreover, comparing the simulation results based on Sigmund's theory
and experimental results, it was shown that the deposition rate C can be
estimated by the depth sputtered, D for Pd film coatings in this experiment
device.
