Abstract
A method of varying the output energy of a radio frequency quadrupole (RFQ) linac is proposed. This is achieved by changing the voltage of only the downstream electrode in the cavity, which is divided by a separating plate provided between longitudinally separated electrodes. The calculated results for 31P1+ acceleration show that the output energy can be varied from 1.1 MeV to 1.96 MeV without greatly broadening the energy spread: the lengths of the upstream and downstream electrodes are about 1.7 m and 1.0 m, respectively. The transmission efficiency for an input current of a few mA is 87% at its maximum and higher than around 50% at all output energies. The current limit is 8 mA at 1.96 MeV. It has also been shown that the gap between the separated electrodes gives scarcely any problem to the transmission.
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