A superconducting solenoid for heavy ion beam focusing

Abstract

A 6 T superconducting solenoid has been constructed to focus heavy ion beams on the production target of radio isotope beams. The design field on axis is 6.2 T with an average current density of 9,600 A/cm 2 . 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 attached onto the center coil without liquid helium involved. The solenoid was successfully trained to 6.2 T, and its optical properties were tested in the beamline at RIKEN. The design features and the test results are presented.

Transfer matrix of a Glaser magnet used for focusing charged particles in beam lines

“…It may be mentioned that at a few places high-field superconducting magnets are used as fragment mass separators in medium energy accelerators [31]. These are solenoids with large aperture [32,33], and so the field has a marked axial variation. The transfer matrix given in this paper may be used for a quick evaluation of the performance of the magnet.…”