Comparison of different extraction and acceleration systems for a high intense proton beam for the future proton linac at GSI

Abstract

For the injection into the future proton LINAC at GSI, the ion source and low energy beam transport system has to deliver a 100 mA proton beam with approximately 100 keV at the entrance of the radio frequency quadrupole within an acceptance (normalized, rms) of 0.2 π mm mrad. The proton yield provided by the ion source should be 90% or higher, whereas the emittance should be as small as possible. The article presents the results of computer simulations done with AXCEL-INP for three different extraction and acceleration systems: a compound system, a pentode extraction system, and a combination of a triode extraction system followed by a separately screened dc acceleration system. These systems will be discussed in terms of beam brightness and facile handling for beam time operation.