Abstract
High power neutral beam injector has been developed with particle energy of 25 keV, a current of 60 A, and several milliseconds pulse duration. Six of these injectors are planned to be used for the upgrade of the neutral beam system of a gas dynamic trap device. The injector ion source is based on an arc-discharge plasma box. The plasma emitter is produced by a 1 kA arc discharge in hydrogen. A multipole magnetic field produced with permanent magnets at the periphery of the plasma box is used to increase its efficiency and improve homogeneity of the plasma emitter. The ion beam is extracted by a four-electrode ion optical system (IOS). Initial beam diameter is 200 mm. The grids of the IOS have a curvature for geometrical focusing of the beam. The optimal IOS geometry and grid potentials were calculated to provide precise beam formation. The measured angular divergence of the beam is 0.02 rad, which corresponds to the measured width of the beam profile at a focal point of 2.5 cm.
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