| 摘要 |
PURPOSE:To improve time delay in trigger discharge in vacuum by providing irradiation port at one part of a vacuum vessel as well as drawing out of the vacuum vessel while sealing an optical fiber therein, then irradiating at least one of paired electrodes with ultraviolet light from an ultraviolet light generator outside the vacuum vessel. CONSTITUTION:Voltage is applied between opposing electrodes 2, 3 from the outside, while the surface of the electrode 3 is irradiated with ultraviolet light by an ultraviolet irradiator 14 through a optical fiber 13, whereby secondary electrons occurs actively to impinge on the electrode 2, generating ions of such as metal vapor between the electrodes 2, 3. When a pulse source 11 is started in this state by means of an outside signal, creaping discharge occurs between a third electrode 6 and the electrode 2 through an insulator 5, whereby the opposing electrodes perform discharge according to the ions generated between the electrodes. In this case, since irradiation of ultraviolet light is carried out first to generated a lot of ions, effect on the electrode is moderated, thereby sharp improvement in the time delay in discharge is attained. |
