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Accelerator and medical system and operating method of the same

  • US 6,472,834 B2
  • Filed: 02/26/2001
  • Issued: 10/29/2002
  • Est. Priority Date: 07/27/2000
  • Status: Expired due to Term
First Claim
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1. A cyclic type accelerator comprising:

  • deflection electromagnets and four-pole electromagnets for making a charged particle beam circulate;

    a multi-pole electromagnet for generating a stability limit of resonance of betatron oscillation for emission of said charged particle beam; and

    a high frequency source for applying a high frequency electromagnetic field to said beam to move said beam to the outside of said stability limit, thus exciting resonance in said betatron oscillation, characterized in that, in order to-apply a high frequency electromagnetic field to said beam to move said beam to the outside of said stability limit, said high frequency source generates an AC signal including a plurality of frequency components, between which the minimum frequency difference is in the range from 500 Hz to 10 kHz inclusive, and the phase of the plurality of frequency components is adjusted so that the phase difference between each frequency components take the values other than an integer×

    π

    .

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