Present Design and Calculation for the Injection-Dump Line of the Rcs at J-PARC

The construction of J-PARC(Japan proton accelerator research complex) is in a rapid progress, where the first beam commissioning of 3-GeV RCS(rapid cycling synchrotron) is expected to be start on May, 2007. The present work concerns the very final design as well as the calculation of the injection line until the beam dump. This includes an accurate and safe aperture list of all elements in the injection-dump line as well as an accurate estimation of the uncontrolled beam losses so as to optimize them concerning mainly the radiation issues and moreover for the hands-on maintenance.