Improved performance of the munich heavy ion postaccelerator

Experience with the Munich heavy ion postaccelerator after six years of operation and improvement of the performance of the postaccelerator are described. The improvement has been performed by using a new type of drift tube with considerably reduced contribution to the resonator capacitance, by mounting more drift tubes and by installing a drift tube configuration with constant gap voltage distribution along the resonator axis. Various techniques of bunching or pulsing the beam have been developed and used.