Abstract
Considerable interest has been shown in the electrohydrodynamic liquid field emission ion source, from which positive ions emitted under the action of high electric fields, and high brightness sources are being developed with a variety of applications in mind. The basic principles of such sources are discussed. The threshold voltage Vth, the ion current (I) versus extraction voltage (V) relationships under various operating temperatures To, I versus To relationship, the angular current intensity and brightness, energy spread, as well as the current changes slowly with time under a definite voltage, are presented and discussed. The experiments show that the present performance of the ion source is as follows: The threshold voltage is about 5.4 kV, the brightness equal to 1×108A/cm2 sr, and energy spread of 26 eV.
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