47 Vormann, Hartmut Barth, Winfried Miski-Oglu, Maksym Scheeler, Uwe Vossberg, Markus Yaramyshev, Stepan Zimmermann, Frank Tanaka, Hitoshi Sudmuang, Porntip Klysubun, Prapong Sunwong, Prapaiwan Chanwattana, Thakonwat Petit-Jean-Genaz, Christine Schaa, Volker R. W. LIN OPE High Current Heavy Ion Beam Investigations at GSI-UNILAC Proceedings of the 13th International Particle Accelerator Conference 13th International Particle Accelerator Conference JACoW Publishing Geneva, Switzerland Bangkok, Thailand 10.18429/JACOW-IPAC2022-MOPOST012 English 78-81 The 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. Published by JACoW Publishing under the terms of the Creative Commons Attribution 3.0 International license. ; Proceedings of the 13th International Particle Accelerator Conference ; Accelerator Physics MC4: Hadron Accelerators Contribution to a conference proceedings 2022 2022-06-12 - 2022-06-15 GSI-2025-00481 2022-06-12 - 2022-06-15 2022 https://repository.gsi.de/record/357827 https://doi.org/10.18429/JACOW-IPAC2022-MOPOST012