An advanced Electron Beam Ion Source (EBIS) was successfully used over the last several years at Brookhaven National Laboratory to supply highly charged ion beams of different elements to the Relativistic Heavy Ion Collider (RHIC) and to the NASA Space Radiation Laboratory (NSRL). In many cases there is an advantage to inject isotopically pure beams of singly charged ions into EBIS to enhance RHIC luminosity. For this purpose we are developing isotope separator based on 90° double-focusing dipole magnet coupled to a hollow cathode ion source. This source is capable to generate 1+ ion beams of different elements for external injection into EBIS with intensity high enough to completely fill capacity of EBIS ion trap. Quadruplet of electrostatic quadrupole lenses has been installed in front of the magnet to separate different isotopes in the plane of output slit. CsI (Tl) scintillator placed at this plane has been used to optimize mass resolution of the separator. The main challenge was to achieve simultaneously both required resolution and about 100% transmission from ion source to the output of the separator. The results of measurements for krypton, xenon and zirconium isotopes with natural abundance will be presented and discussed.
This work has been supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy, and by the National Aeronautics and Space Administration.