P. Forck, F. Heymach, T. Hoffmann, A. Peters, P. Strehl, (GSI)
For the characterization of the ion beam delivered by the new High Current LINAC at GSI (beam pulse power up to 1 MW), sophisticated, mainly non-intersepting diagnostic devices are developed. Beside the general set-up of a versatile test bench, we discuss in particular bunch shape and emittance measuring devices. To investigate the intensity dependence of micro-bunches we use a direct time-of-flight technique with a diamond particle detector. Rutherford scattering in a thin gold foil is used for appropriate reduction of the count rate. The achieved resolution is about 30 ps. For the determination of the energy spread a coincidence technique is applied, using secondary electrons emitted by the ion passing through a aluminum foil 80 cm down stream of the diamond detector. The transverse emittance is measured within one macro pulse with a pepper-pot system. It is equipped with a high performance CCD camera and a HeNe laser for online calibration. Results from the commissioning of the new LINAC are presented and theadvantages, as well as the limitations of the devices are discussed.
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