FIELD: heat-to-power conversion devices. SUBSTANCE: wire-net cathode is used to enlarge electron evaporation surface. As an alternative or additional means electron emission surface may be curved to enlarge its area. Laser provides for quantum interference of electrons just before they have reached anode with the result that their energy levels go down to such extent that they are more readily captured by anode. EFFECT: enhanced converting ability and reduced electron dissipation in converter. 20 cl, 8 dwg
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