Abstract
An RFQ linac TALL is constructed. The machine is designed to accelerate heavy ions with charge to mass ratio of 1 to 1/7 from 8 up to 800 keV/u. It will be used as the first stage of an injector for a heavy ion synchrotron TARN II which is under construction at INS. The acceleration cavity is of four vane structure driven with loop coupling at 100 MHz. The cavity is 58 cm in diameter and 730 cm in length. No vane coupling ring is used. A field uniformity was obtained easily within an error of ± 6% azimuthally and ± 5% longitudinally by use of side and end tuners. The TE210 mode has a resonant frequency of 101.78 MHz, 0.93 MHz lower than that of the closest mode TE111.
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