Argonne National Laboratory has made progress with its booster development project to increase the circulating intensity in the 12‐GeV Zero Gradient Synchrotron. In a series of tests last spring, experimenters successfully injected negative hydrogen ions(H−)from the 50‐MeV linac into the booster synchrotron—the former 2‐GeV electron accelerator acquired from Cornell University in 1969. The ions were then stripped of electrons, leaving a proton beam that was coasted (not accelerated) around the booster ring.