Investigation of a High Voltage Hollow Cathode Electron Beam Source

Johnny Hansen

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    An investigation is presented of the possibility of developing an electron accelerator comprising several radiation units with a relatively low power per unit, and without the many elements such as accelerator tube, focusing and scanning systems. A study was desired of an electron gun operated at 200 kV based on the cold, hollow-cathode principle, where problems concentrated on the design of an electrode configuration that could withstand the high voltage at a pressure where a plasma could be generated too. Studies concentrated on the high voltage breakdown criterion in the pressure range 10-3 to 10-2 torr and on the plasma formation in a low pressure gas discharge. Controlled beams with energies up to 130 keV were generated in nitrogen at a pressure of 2 • 10-3 torr with a beam current of about 1 mA in a continuous operation. The high voltage was limited by the existing power supply in the laboratory, however, a decision was taken not to purchase a power supply that could have delivered the required voltage.
    Original languageEnglish
    Place of PublicationRoskilde, Denmark
    PublisherRisø National Laboratory
    Number of pages51
    ISBN (Print)87-550-0462-8
    Publication statusPublished - 1977
    SeriesDenmark. Forskningscenter Risoe. Risoe-R


    • Risø-R-359
    • Risø report 359
    • Risø-359


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