FIRST YEAR OF OPERATION OF THE HEIDELBERG HIGH CURRENT INJECTOR

At the Max-Planck-Institut fur Kernphysik in Heidelberg the first phase of the High Current Injector was successfully finished. The Linac, consisting of a high current source for singly charged ions, two RFQs and eight 7-gap-resonators demonstrated its performance with an accelerated He-beam (1.85 MeV/u, Q/A=1/4) and an Oxygen-beam (0.5 MeV/u, Q/A=1/9). For Coulomb explosion imaging experiments at the storage ring we were able to produce and deliver sev- eral different light molecules, singly charged, with intensi- ties about 10 A. In a second phase an ECR source will be added to provide the full spectrum of also highly charged ions up to uranium. To increase the intensity of various kinds of ions for the Hei- delberg Heavy Ion Storage Ring TSR a High Current Injec- tor was developed and built. In its first phase the new in- jector consists of a commercial CHORDIS ion source (1), two RFQs (2) and eight 7-gap resonators (3) for the vari- ability of the end energy for Q/A 9. The CHORDIS is optimized for mainly singly charged ions. To provide also highly charged heavy ions an ECR-source, which is under installation at a test bench, will deliver the full spectrum of highly charged heavy ions in a second phase. Figure 1 shows the layout of the injector. The accelerator is in- stalled parallel to the Tandem and beams are injected di- rectly into the postaccelerator. In the second phase strip- ping will be used behind the last seven gap resonator and the proper charge state will be selected by an achromatic separator consisting of four 60 -magnets. Like the existing post accelerator the new injector operates at 108.48 MHz. The ion velocity of =v/c=6% after the High Current injec- tor is well adapted to the post accelerator and final energies higher than 5 MeV/u will be achieved for all ion species in a pulsed mode operation with up to 25% duty cycle.