| 摘要 |
1,220,496. Particle accelerators; heavy-ion beam tubes; cathode ray tubes. ROUMANIA, INSTITUTE OF ATOMIC PHYSICS. 10 April, 1968 [10 April, 1967], No. 17174/68. Heading H1D. A linear accelerator has a hollow tubular electron or ion beam formed by an annular source S at one end of an elongated evacuated chamber 7 and, after acceleration through the annular passage of a particle accelerator to the opposite end of chamber 7, the beam is focused on to the longitudinal axis of the chamber by a rotationally symmetrical deflector 6. As shown, the beam is accelerated by a continuous or pulsed electric field applied to tubular electrodes 2-5 and focused by tubular electrode 6. Alternatively, the beam is accelerated by a radiofrequency field existing in a waveguide which is loaded with discs which may have drift tubes, Figs. 3 and 4 (not shown), or the wave guide may have an interdigitated loading structure, Fig. 5 (not shown). Acceleration may also be obtained by using a cylindrical or coaxial cavity, Figs. 6A, 6B (not shown). A number of tubular beams of different radii may be used with a filiform beam to enhance the intensity.
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