engVormann, HartmutBarth, WinfriedMiski-Oglu, MaksymScheeler, UweVossberg, MarkusYaramyshev, StepanSunwong, PrapaiwanChanwattana, ThakonwatPetit-Jean-Genaz, ChristineSchaa, Volker R. W.Zimmermann, FrankTanaka, HitoshiSudmuang, PorntipKlysubun, PrapongHigh Current Heavy Ion Beam Investigations at GSI-UNILACAccelerator PhysicsMC4: Hadron AcceleratorsThe GSI Universal Linear Accelerator UNILAC and the synchrotron SIS18 will serve as injector for the upcoming FAIR-facility. The UNILAC-High Current Injector will be improved and modernized until FAIR is commissioned and the Alvarez poststripper accelerator is replaced. The reference heavy ion for future FAIR-operation is uranium, with highest intensity requirements. To re-establish uranium beam operation and to improve high current beam operation, different subjects have been explored in dedicated machine investigation campaigns. After a beam line modification in 2017 the RFQ-performance had deteriorated significantly; new rods have been installed and the RF-working point has been redefined. Also the Superlens-performance had become unsatisfactory; improved with a modified RF-coupler. With a pulsed hydrogen gas stripper target the uranium beam stripping efficiency could be increased by 65%. Various work has already been carried out to establish this stripper device in routine operation. With medium heavy ion beams a very high beam brilliance at the end of transfer line to SIS18 was achieved. Results of the measurement campaigns and the UNILAC upgrade activities will be presented.Geneva, Switzerland : JACoW Publishing 78-81 (2022). doi:10.18429/JACOW-IPAC2022-MOPOST012info:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/publishedVersionProceedings of the 13th International Particle Accelerator ConferenceProceedings of the 13th International Particle Accelerator Conference<br/>13th International Particle Accelerator Conference, IPAC2022, Bangkok, Thailand, 2022-06-12 - 2022-06-15JACoW Publishing2022info:eu-repo/semantics/openAccessDEhttps://repository.gsi.de/record/357827https://repository.gsi.de/search?p=id:%22GSI-2025-00481%22Researchersinfo:eu-repo/semantics/altIdentifier/doi/10.18429/JACOW-IPAC2022-MOPOST012info:eu-repo/semantics/altIdentifier/doi/10.15120/GSI-2025-00481