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ROTATABLE CATHODE SPUTTERED CATHODE ,< CATHODE MATERIAL EROSION / PLASMA CHAMBER COLLIMATING PLASMA DISK ROTATABLE . CATHODE NO. 1 NO.2
NO.4
NO.5
ORNL-DWG 75-2488 NO.3
Fig. S. Five views are shown of the rotatable cathodes, collimator discs, and plasma chamber for a proposed mode of operation to increase the cyclotron beam in- tensity. (1) The cathodes and collimating discs at the beginning of an ion source burn. (2) The eroded cathodes and the collimating discs with sput- tered tantalum near the end of an ion source burn. (3) The collimators and only one cathode are rotated for the next burn. This cathode arrangement allows the art to be struck easily and also results in increased beam near the end of the source life. (4) The cathodes and collimator discs near the end of the second burn. (5) The cathodes and collimator discs positioned for the beginning of the third burn.