| 摘要 |
PURPOSE:To eliminate an expansion of photoelectron beams on a fluorescent screen owing to sweeping the photoelectron beams, and to gain a good time- resolution ability, by deflecting the photoelectron beams emitted from a photoelectric surface immediately after an acceleration, and then focusing the deflected photoelectron beams on the fluorescent screen. CONSTITUTION:An acceleration electrode 4 to accelerate the photoelectron beams A and B emitted from a photoelectric surface 3, a deflecting device 7 to deflect the photoelectron beams A and B accelerated by the acceleration electrode 4, and a focusing device 5 to focus the deflected photoelectron beams A and B are provided, and the photoelectrons A and B are deflected immediately after they are accelerated, and they are focused on a fluorescent screen 9 after the deflection. In such a way, an expansion of the photoelectron beams A and B on the fluorescent screen 9 generated when the photoelectron beams A and B are swept is eliminated, and a good time-resolution ability can be obtained.
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