Simulation of space charge effects in RFQ-MAXILAC

Some improvements have been made to the computer program PARMTEQ and it has been used to study beam dynamics in the heavy ion MAXILAC. The measured performance of the 5 tank prototype can be understood reasonably well in terms of emittance growth and losses due to space charge, although the measured maximum transmission is worse than predicted. Two different methods of calculating the space charge forces have been developed to the point of giving similar results. The sensitivity of the prototype structure to mechanical misalignments is discussed. Comparisons are made with existing light ion RFQ accelerators, which generally give brighter beams, and understood in terms of the maximum achievable voltage. All simulations are for Argon 1+ and are easily scaled for other ions. (orig./HSI)