W.BARTH, P.FORCK, J.GLATZ, W.GUTOWSKI, G.HUTTER, J.KLABUNDE, U.RATZINGER, P.STREHL, W.VINZENZ, D.WILMS (GSI Darmstadt, Germany)
The new 1.4 MeV/u front end of the Unilac accelerates ions with A/q rations up to 65 and with beam intensities in emA up to 0.25A/q. The maximum beam power is up to 1300 kW. During the stepwise linac commissioning from Aptil to September '99 the beam behind of each cavity was analyzed by capacitive pick up-probes, beam transformers, emittance measurement devices and by diamond detectors for bunch length measurements. A very stable Ar1+ beam out of a volume plasma source MUCIS was used mainly. The measured 80 % emittance areas around 0.45 pi mm mrad, normalized are close to the results from beam simulations, as well as the bunch width of around 1 ns FWHM at a position 5 m behind of the linac exit. Up to 80 % of the design intensity at the linac exit were achieved. In February 2000 an U4+-beam from the MEVVA source was accelerated for the first time. The experience from the rf conditioning of all cavities will be described.
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