Beam dynamics in the 1.3 GeV high intensity ESS coupled cavity linac

The 700 MHz coupled cavity linac (CCL) of the European Spallation Source (ESS) accelerates H/sup -/-ions up to 1.334 GeV. The bunch current is 214 mA and the average current 3.84 mA. Four tanks are fed by one 4 MW klystron. The phase slip of 4/spl deg/ at injection is not critical. After every second tank a doublet is installed for transverse focusing providing a 'round' beam. The other intertank sections are used for beam diagnostic elements and steering. To find the smallest injection energy, RMS and total emittances are studied by multiparticle calculations and by varying the injection energy between 70 and 150 MeV. In addition the influence of field and phase errors is considered. For the low loss injection into the following compressor rings, the problem of partly filled bunches is examined.