Charge Breeding Simulations in a Hollow Gun Ebis

Charge breeding technique is used for Radioactive Ion Beam (RIB) production in the Isotope Separation On Line (ISOL) method in order of optimizing the re-acceleration of the radioactive element ions produced by a primary beam in a thick target. That technique is realized by using a device capable of increase the radioactive ion charge state from +1 to a desired value +n. In some experiments a continuous RIB of a certain energy could be required. Recently, a charge breeding device based on a hollow gun EBIS that in principle could reach a Continuous Wave (CW) operation, has been proposed1). Although, in principle, the hollow in the electron beam produced by that EBIS can be reduced up to zero by an enough high focussing solenoid magnetic field, a reduction on the ion charge state increase efficiency should be expected. In order to study that problem, a code already developed for studying the ion selective containment in a EBIS with RF quadrupoles, BRICTEST2), has been implemented. In this paper, the ion charge state breeding decrease due to the hollow electron beam has been studied by simulating the ion motion inside the hollow gun EBIS with the implemented BRICTEST code