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A room temperature heavy ion linac has been proposed as a new injector ofCSRm (the main Cooler Storage Ring) at HIRFL (Heavy Ion Research Facility inLanzhou), which is expected to improve the performance of HIRFL. The linacinjector can supply heavy ion with maximum mass to charge ratio of 7 andinjection kinetic energy of 7.272MeV/u for CSRm, and the pulsed beam intensityis 3emA with the duty factor of 3%. Compared with the present cyclotroninjector SFC (Sector Focusing Cyclotron), the beam current from linac can beimproved by 10-100 times. As the pre-accelerator of the linac, the 108.48MHz4-rod RFQ accelerates ion beam from 4keV/u to 300keV/u, which achieves thetransmission efficiency of 95.3% with 3.07m long vanes. The phase advance hasbeen taken into account to analysis the error tolerance, and parametricresonance have been carefully avoided by adjusting the structure parameters.KONUS IH-DTLs, which follow the RFQ, accelerate the ions up to the energy of7.272MeV/u and inject into HIRFL-CSRm. The resonance frequency is 108.48MHz forthe first two cavities and 216.96MHz for the last 5 DTLs. The maximumaccelerating gradient can reach 4.95MV/m in DTL section with the length of17.066m, and the total pulsed RF power is 2.8MW. A new strategy, for thedetermination of resonance frequency, RFQ vane voltage and DTL effectiveaccelerating voltage, is described in detail. The beam dynamics design of thelinac will be present in this paper.

Conceptional Design of Heavy Ion Linac Injector for HIRFL-CSRm