Ion beam acceleration and new operation modes at the TSR Heidelberg

A newly designed radio frequency cavity was used at the storage ring TSR in Heidelberg to accelerate stored /sup 12/C/sup 6+/ (E/sub 0/=73.3 MeV) beams. It was possible to accelerate about 90% of the stored particles by more than a factor of three in kinetic energy (E/sub fin/ /spl ap/240 MeV). A new operating mode of the machine close to the transition energy was also investigated. Up to 10 /spl mu/A /sup 12/C/sup 6+/ and protons could be stored, however the beams were susceptive to longitudinal instabilities. For 21 MeV protons (/spl gamma/=1.02) a /spl gammasub tr/ parameter of 1.04 could be reached. A new method to produce a beam of polarized ions, based on spin selective attenuation by a polarized atomic hydrogen target was successfully proved with 23 MeV protons. To minimize losses of the beam particles the TSR was operated in the low-beta mode. After one hour a beam polarisation of 0.014 was achieved.<
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