LIS in low power density for RHIC-EBIS

The Electron Beam Ion Source (EBIS) project at Brookhaven National Laboratory is a new heavy ion preinjector for Relativistic Heavy Ion Collider (RHIC) and NASA Space Radiation Laboratory science programs. Laser Ion Source (LIS), which can supply many heavy ion species using solid targets, is a candidate of a primary ion source provider for RHIC-EBIS. LIS experiment with 5 Hz operation, which is required practically in RHIC-EBIS, was demonstrated to understand the beam property for long operation time. High laser power density decayed the peak current and ion yield with operation time and did not keep the surface of target flat. On the contrary, the beam in low laser power density kept the performance in long operation time.