METHOD OF EXTRACTION OUT OF A CHARGED PARTICLE ISOCHRONOUS CYCLOTRON AND DEVICE APPLYING THIS METHOD.

摘要

Method extration of a charged particle beam out of an isochronous cyclotron (1) having an electromagnet constituting the magnetic circuit which includes at least a number of areas (3,3 ') called "hills" where air gap is reduced, separated by spaces in the form of sectors (4) called "valleys" where the air gap is of larger size, the extraction method being characterized in that the particle beam is extracted without using an extraction device by a particular arrangement of the magnetic field obtained by designing the air gap of the magnet at the hills (3,3 ') of the isochronous cyclotron in such a way that the relative dimension of the gap of the magnet at the hills in the vicinity of the maximum radius to the gain in radius per revolution of the particles accelerated by the cyclotron at this radius is less than 20.