Developing a multi-plates velocity map imaging spectrometer for 3D velocity vector imaging of electrons and ions

In this paper, the concepts, design and charged particles simulation for developing a new multi-plates Velocity-Map Imaging (VMI) spectrometer are discussed. This spectrometer very is powerful for 3D velocity vector imaging of charged particles. The standard design of Eppink and Parker [Rev. Sci. Instrum. 68, 3477 (1997)] velocity map imaging has three-plates which under suitable voltage at each plates make a “asymmetric immersion electrostatic lens”. This lens mapped the same initial velocity vector at one point on the detector. The three-plate VMI setup is useful for 3D imaging of low energy electrons (<100eV). We are developing multi-plates VMI setup for mapping of high kinetic energy (100eV-1keV) electrons.