Further development of low noise vacuum arc ion source

Efim Oks, George Yushkov, Irina Litovko, André Anders, Ian Brown
2002 Review of Scientific Instruments  
Based on the idea of a space-charge-limited mode of operation, the influence of a pair of electrostatic meshes on the beam parameters of the LBNL MEVVA-5 ion source was investigated. The meshes were placed in the expansion zone of the vacuum arc plasma. Apart from reducing the level of beam current fluctuations, this mode of operation provides significant control over the ion charge state distribution of the extracted beam. These effects can be understood taking not only space charge but also
more » ... e charge but also the high-directed ion drift velocities into account that are the same for different ion charge states of a material. The results of simulations of the processes involved are in good agreement with the experimental results.
doi:10.1063/1.1427040 fatcat:522noml7sbajfiuqqmwdwsuqya