FABRICATION AND TESTING OF THE FIRST MAGNET PACKAGE PROTOTYPE FOR THE SRF LINAC OF LIPAC

The Linear IFMIF Prototype Accelerator (LIPAc) will be a 9 MeV, 125 mA CW deuteron accelerator which aims to validate the technology that will be used in the future IFMIF accelerator. The SRF Linac design is based on superconducting Half Wave Resonators (HWR) cavities operating at 4.4 K. Due to space charge associated to the high intensity beam, a short, but strong, superconducting focusing magnet package is necessary between cavities. The selected configuration has been a superconducting NbTi solenoid acting as a magnetic lens and a concentric outer solenoid in antiparallel configuration to reduce the harmful stray field on the cavities. The selected arrangement for the steerers is a pair of parallel racetrack coils for each vertical and horizontal axis. This paper describes the manufacturing techniques of the different coils, and the tests realized in warm and cold conditions. Special attention is put to the training test of the main solenoid, since the nominal working point in the load line is very high (86.2%).