B-H fusion is the last stage of research. He and D are being used now to tune the devices, as their characteristics and masses are about right, and the energy level can be ramped up to confirm that the temps required by B-H are possible. This has been done, and now design refinement is occurring prior to demonstrating B-H. The last stage will be using beryllium electrodes/cathodes which permit the X-rays to escape the chamber and be trapped/drained by the outer foil shell.
The direction is inherent in the magnetic plasmoid which finally implodes during the fusion event. It squirts out 2 beams in opposite directions, one of which is the He4+ beam.
