Ignition conditions for magnetized target fusion in cylindrical geometry

Ignition conditions in axially magnetized cylindrical targets are investigated by examining the thermal balance of assembled DT fuel configurations at stagnation. Special care is taken to adequately evaluate the energy fraction of 3.5 MeV alpha particles deposited in magnetized DT cylinders. A detailed analysis of the ignition boundaries in the rR,T parametric plane is presented. It is shown that the fuel magnetization allows a significant reduction of the rR ignition threshold only when the condition BR >~6×105 G cm is fulfilled (B is the magnetic field strength and R is the fuel radius).