A. S. Berdnikov, L. N. Gall, J. I. Khasin
Institute for Analytical Instrumentation RAS, Saint-Petersburg
This paper describes a procedure for mutual
adjustment of ion source parameters and the optical scheme of a magnetic
mass spectrometer. The optical schemes of the ion source and the static
mass analyzer are considered as a single part and the movement of the ion
beam particles is considered as the evolution of a 6-dimensional phase
space region. Electrostatic and magnetic fields, as well as the ion trajectories,
are simulated by SIMION 3D (version 7.0). Special sub-modules enable one
to simulate the beam initial conditions and to represent the SIMION output
data in terms of phase space. (These modules interact with the user via
phase space language, communicate with SIMION, using its input and output
files, allow one to view the beam phase space characteristics as user-friendly
pictures.) The procedure is used to optimize the ion source for the mass
spectrometer MSD650. Experimental results of mutual adjustment of the ion
beam characteristics and the mass spectrometer "transparency" are presented.