Abstract
Electrical output parameters are presented for four one-element cylindrical TEC operating with cesium plasmas and electrode gaps from 0.3 to 0.8 mm. The cylindrical emitters have been made by vapor-phase epitaxial deposition of tungsten on cylindrical molybdenum substrates having [111] axial orientation under the conditions where the deposit is automatically formed faced with (110) planes. The average vacuum work function is up to 5.3 eV. The collector is made of a molybdenum-ruthernium alloys. Tests have been made on how the vacuum work function of the emitter influences the output parameters. Calculations combined with experiment have been used to estimate the work functions and electron temperatures in the plasma.
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