Assembly and RF Tuning of the IH-DTL for the HIT LINAC

The 20 MV, 217 MHz IH-DTL for the HIT facility has been assembled and mechanically aligned until July 2006. RF tuning of the 3.8 m long tank with 56 gaps has been done from April to October 2006. The beam commissioning at the HIT facility in Heidelberg was performed successfully in December 2006. Assembly Alignment plates had to be invented to adjust the side walls of the middle frame against the stiff lower half shell of the tank. The copper plating of the cavity at GSI worked properly besides a rather thick layer on the sealings which resulted in a frequency shift of −0.7 MHz. The three quadrupole triplet lenses inside the tank are directly connected to the lower tank half shell. The maximum transverse deviations of individual quadrupoles amount up to ±0.2 mm after the final alignment – a factor of 2 more than specified but still tolerable, as checked by LORASR beam dynamics simulations (Fig. 1). We would like to thank our GSI colleagues T. Dettinger, N. Bönsch, J. Cavaco and N. Kischnick for their committed workmanship at copper plating and assembly. -10 -8 -6 -4 -2 0 2 4 6 8 10