Ion trapping in the CESR B-factory

Analysis of the ion trapping expected for the Cornell B-factory shows that the presence of 10% gap in the bunch train will be very effective in reducing the ultimate ion density. With a gap the average ion lifetime is seen from simulations to be under 10/sup -5/ seconds or about a few turns. While the average lifetime is short both simulation an analysis show that there exists near the center of the beam a small core of long lived ions. The resulting ion density distribution is then substantially different from the (Gaussian) beam distribution.<>