A study of time and angle correlations in the ion emission from Gallium liquid metal ion sources.
01 January 1988
An ion streak camera has been constructed for measurement of time and angle correlations in ion emission from liquid metal ion sources. Emission events are detected with a chevron microchannel plate multiplier (MCP) as a fan of the ion beam is electrostatically deflected across the plate. The intensified images on the phosphor of the MCP are recorded in a CCD camera synchronized with the sweep. The images are then digitized and fourier transformed to obtain 2-dimensional power spectra in frequency and angular wave number. Experiments have been performed using sweep times of 100 nsec to 10 microseconds. The time behavior of the emission has been examined for low current "DC" beams and for beams for which the extractor of the source has been driven at 2 MHz. Preliminary results for the power spectra are presented and discussed for these different cases.