| 摘要 |
The electron beam is irradiated from the center part to the outer direction in the irradiation duct. Then required electron range is decreased and the required beam energy is decreased. The electron beam introduction window is formed as a thin curved surface and made of Al alloy or SiC ceramics, then the energy absorption is decreased, a large beam current is available and X-ray shield become very small sized and very simple. By dividing the acceleration voltage into a positive and negative voltage, the absolute value of the applied voltage is decreased, then the reliability for the insulator is increased and the acceleration voltage can be obtained without mechanical movement.
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