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Method for sweeping charged particles out of an isochronous cyclotron, and device therefor

  • US 6,057,655 A
  • Filed: 04/03/1998
  • Issued: 05/02/2000
  • Est. Priority Date: 10/06/1995
  • Status: Expired due to Term
First Claim
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1. Method of extracting a beam of charged particles from an isochronous cyclotron (1) having an electromagnet constituting the magnetic circuit which includes at least a certain number of sectors (3, 3'"'"'), referred to as "hills", where the air gap is reduced, these being separated by spaces in the form of sectors (4), referred to as "valleys", where the air gap is of larger size, the extraction method being characterized in that the particle beam is extracted by a particular arrangement of the magnetic field, without resorting to an extraction device, this arrangement being obtained by designing the air gap of the magnet at the hills (3, 3'"'"') of the isochronous cyclotron in such a way that the ratio of the dimension of the air gap of the magnet at the hills in the vicinity of-the maximum radius to the gain in radius per circuit of the particles accelerated by the cyclotron at this radius is less than 20.

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