Abstract
We have experimentally detected a heavy-ion beam loss when two harmonic beams are simultaneously accelerated from the ion source in the Oak Ridge Isochronous Cyclotron (ORIC). This loss is dependent upon the pressure in the cyclotron acceleration chamber. The desired low harmonic (high charge state) beam intensity decreases as the vacuum improves which is surprising if the beam losses are primarily due to charge exchange processes with the residual gas. A calculation based upon a space charge interaction model between harmonic beams leads to the conclusion that the beam intensities are of the right magnitude for space charge losses. A beam interceptor for the high harmonic (low charge state) beam located near the ion source is proposed as a solution to this beam loss.
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