Vacuum dissociation at acceleration of H−, D− beams on the AIC-144 S cyclotron

At present, the modification projects of the operating isochronous cyclotrons (IC) are a matter of interest because of the necessity to produce beams of higher intensity and energy for application in medicine and radioisotope production. The advantage of H−, D− acceleration in IC is very well known. But there are restrictions such as ion dissociation which limits the beam intensity. In this connection the problems concerned with dissociation of H−, D− ions were considered in order to define the acceleration conditions in terms of the AIC-144 S vacuum condition influence on it at an isochronous magnetic field of 1.85T. In this paper particular emphasis is given to the acceleration phase shift effect on the H−, D− ion losses. Some results and methods presented with reference to the AIC-144 S are given. The paper is the second part of the previously reported one (Schwabe, 1996).