General Overview After a 4.5-month long shutdown and maintenance period, the re-commissioning of the UNILAC started in April. From end of April till July, a single beam time block was scheduled and in comparison to the previous year, the GSI accelerator facility was completely operational again with one exception. Since the UNILAC RFSystem is under construction, the maximum energy of the Alvarez section was defined to 5.89 MeV/u. So the synchrotron had to be operated with higher RF-harmonic number, what in the end was limiting the maximum revolution frequency and therefore the SIS18 extraction energy. In total the UNILAC has been in operation for 2448 hours and the SIS18 for 1776 hours (504 hours are included for the commissioning of each accelerator after shutdown).
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