Abstract
The computer investigation of secondary electron trajectories in liquid metal ion sources (LMIS) is reported. Calculations show the possibility of electron focusing on the ion emitter needle apex. Secondary electron focusing appears in the electrode configuration that is very common in the needle type LMIS. The secondary electrons may deliver considerable power to the needle apex. A simple theoretical model based on the heat flow equation for the evaluation of secondary electron heating has been proposed. The ion transit time-dependent heating cycle is discussed as a possible mechanism of ion current oscillations in the MHz range.
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