| 摘要 |
<p>1,006,064. Particle accelerators. HIGH VOLTAGE ENGINEERING CORPORATION. May 21, 1962 [May 25, 1961], No. 31656/64. Divided out of 1,006,063. Heading H1D. A beam-steering apparatus is provided in a generally field-free region between the ends of a particle accelerator and comprises a pair of conducting plates 39, 40 flanking the beam trajectory. A resistive path connects the ends of the accelerator, and the plates 39, 40 are connected to points thereon in the electrical vicinity of the field-free region, one of the connections being adjustable to control the potential difference between the plates. As shown, one plate 39 is connected to conductive cylinder 115 and to the mid-point of a potentiometer 37 connecting the adjacent accelerator electrodes 26. The other plate 40 is connected to a potentiometer contact 42 secured to a nut 44 mounted on screw-threaded bolt 46 and prevented from rotating by bar 45. Movement of contact 42 is effected by rotation of insulating rod 50, which may be controlled by an earthed selsyn motor. After initial adjustment; correct beam-centring is automatic despite changes in the accelerating voltage or in the type of particle being accelerated. A second pair of deflecting plates 51 may be provided to effect beam-steering in a perpendicular plane. The apparatus is particularly useful in inclined-field accelerator tubes of the kind disclosed in Specification 1,006,063, but may be used in other accelerators for accurately directing the beam on to a target area.</p> |
