Performance Characteristics of the ZGS

The ZGS intensity has recently been increased. The main factors involved were removing the limitations imposed by the coherent vertical instability and partial correction of tune variations occurring during acceleration. With the higher intensities we observe a growth in the radial size of the beam. This phenomena is discussed briefly. Slow extraction from the ZGS on a "front porch" field over a wide range of momenta has been successful and the fast extraction efficiency has been increased to 50%.