Abstract
Three sections of an accelerator tube have been constructed using glass insulators and inorganic sealing to nickel-iron electrodes. The insulators were designed to minimise the surface electric field in the vacuum side of each gap, and the electrodes were designed to prevent ions generated in the beam region being deposited on the insulator. The sections, protected by spark gaps with active triggering, were cycled through 1000 sparkovers, each sparkover dissipating 200 J of energy per gap. At the end of this testing no noticeable deterioration of the maximum usable field strength had occurred.
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