A SUPERCONDUCTING SOLENOID FOR HEAVY ION BEAM FOCUSING

A 6 T superconducting solenoid has been constructed to fo-cus heavy ion beams on the production target of radio iso-tope beams. The design field on axis is 6.2 T with an aver-age current density of 9,600 A/cm2. The overall coil length is 1.1 meter, and the coil is divided into three equal-length sections to ease winding and to reduce IR drop through diode connection. A main feature of the system is that the solenoid is conductively cooled by a cryocooler directly at-tached onto the center coil without liquid helium involved. The solenoid was successfully trained to 6.2 T, and its op-tical properties were tested in the beamline at RIKEN. The design features and the test results are presented