A charge stripper ring for RIKEN RI Beam Factory

For the upgrade of the RIKEN RI Beam Factory (RIBF) to increase the intensity of heavy ion beams, especially for the heaviest uranium beams the charge conversion efficiency of the two charge strippers (He gas and rotating graphite sheet disk strippers) is not sufficient and represents a serious bottleneck for the intensity upgrade. A new device called Charge Stripper Rings (CSRs) has been proposed and is being designed as an effective way to dramatically increase charge conversion efficiency beyond the 50% level, which is 10 times the current level. The design and development status of CSRs will be discussed.