| 摘要 |
A high voltage, high current circuit (190) contained within a vacuum enclosure (180). The vacuum enclosure further contains internal vacuum pumping means (240, 242, 244, 246). The enclosure comprises an exhaust tubulation (404) for evacuating the enclosure via an external vacuum pump (not shown), which may be subsequently sealed (as shown). The enclosure comprises vacuum sealed, electrically insulated feedthroughs (202, 204, 206, 212 …) passing electrical conductors from outside the enclosure, to within the enclosure. The feedthroughs allow the electrical conductors to be insulated from the enclosure, and maintain the vacuum seal. Electrical insulation (270) is provided within the electrical enclosure to minimise internal electrical short circuits and allow for minimising the overall size requirements for the vacuum enclosure. The high voltage, high current circuit comprises at least two cold-cathode field emission electron tubes (210, 220, 230). The tubes are configured to operate at a high voltage and high current, and are arranged to implement a circuit function. The tubes may be in the form of a Bi-tron, tetrode or pulsatron tube. |
