Beam Particle Identification and Tagging of Incompletely Stripped Heavy Beams with HEIST

A challenge preventing successful inverse kinematics measurements with heavy nuclei that are not fully stripped is identifying and tagging the beam particles. For this purpose, the HEavy ISotope Tagger (HEIST) has been developed. HEIST utilizes two micro-channel plate timing detectors to measure time of flight, a multi-sampling ion chamber to measure energy loss, and a high purity Ge detector to identify isomer decays and calibrate the system. HEIST has successfully identified $^{198}$Pb and other nearby nuclei at energies around 75 MeV/A. In the experiment discussed, a typical cut containing 89% of all $^{198}$Pb$^{+80}$ in the beam had a purity of 86%. The maximum purity of a cut is limited by any charge states of the same element that overlap with the isotope of interest. The observed charge state populations of these ions are presented and are moderately well described by the charge state model GLOBAL.