Abstract
Beam particles which undergo charge-charging collisions with gas atoms during their passage through a bending magnet follow trajectories which deviate from the primary ion and neutral beams. In view of the large beam powers and relatively high local gas pressure and resulting high charge-changing probability in the JET Neutral Injection bending magnets, the power deposition from such ‘devious’ particles on various components throughout the system cannot be ignored. The power contained in the devious particle beams amounts to more than two megawatts per injector. This paper describes the results of computations of the distribution of the devious particles and resultant power densities using a three-dimensional magnetic field code and associated particle tracing subroutine. The results have been used to determine the size and position of suitable collectors to capture these devious particles.
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