Concept of curved magnetically guided liquid lithium target without a back plate for IFMIF

Kimura, Haruyuki; Hoashi, Eiji*

Curved magnetically guided lithium target (MGLT) without a back plate was proposed for accelerator-based intense neutron source such as IFMIF. The curved MGLT can replace conventional lithium target with a curved back plate under the most severe condition on neutron irradiation. The magnetic field suited for MGLT is produced in combination of radiation-proof resistive coils and F82H parts (yokes, nozzles and high flux test module (HFTM)). Shape of the magnetic field becomes curved in the target region by setting HFTM closely to MGLT. Lithium flow on MGLT was analyzed in detail by two dimensional equations of motion with magnetic field calculated by the Poisson Superfish code. The necessary magnetic flux density at the target region was found to be about 0.5 T to fulfill the IFMIF target conditions; flow speed of 15 m/s, curvature radius of 1-1.6 m and flow thickness of 0.025 m. A narrow gap (a few mm) between MGLT and HFTM could be controlled via control of the coil current.