Lawrence Berkeley

An intensive theoretical program was launched to try to understand the conditions for safe propagation of intense beam currents in focussing systems, such as continuous and interrupted solenoid lens systems, and quadrupole strong-focussing systems. Because the Bevalac is an operating heavy ion linac and synchrotron facility with an ongoing R and D effort and in expectation of immiment upgrading to bring it up to a uranium-ion capability, it was a natural choice to make an addition to these activities to examine low-β rf accelerating structures and ion sources suitable for HIF. An experimental program on intense beam propagation was clearly of high priority. Experiments scaled in particle mass, for example, electron table-top devices, even proton models, were rejected because of the large extrapolation factors in favor of proceeding directly to heavy ions