357443 20250208100459.0 10.18429/JACOW-IPAC2024-TUPS13 doi 10.15120/GSI-2025-00400 datacite_doi GSI-2025-00400 English Bozyk, Lars P:(DE-Ds200)OR2146 0 Corresponding author 15th International Particle Accelerator Conference IPAC2024 Nashville 2024-05-19 - 2024-05-24 USA SIS18 Operation with $U^{28+}$ 2024 JACoW Publishing 1661-1664 pages1.5 MB CONFERENCE_PAPER ORCID Conference Paper 33 EndNote INPROCEEDINGS BibTeX conferenceObject DRIVER Output Types/Conference Paper DataCite Contribution to a conference proceedings contrib contrib PUB:(DE-HGF)8 1738928850_2659993 PUB:(DE-HGF) Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 license. In SIS18 U²⁸⁺ is used to reach highest heavy ion beam intensities for FAIR-operation. The medium charge state avoids losses during stripping processes and shifts the space charge limit to higher number of particles. Nevertheless, these ions are subjected to ionization loss in collisions with residual gas particles. Via ion impact induced gas desorption a feedback between vacuum quality and beam emerges, yielding in a beam intensity limitation. The installation of a charge exchange collimator is one of the several upgrade measures which have been performed to shift this limit. They are equipped with a current measurement system to detect charge exchanged ions, which is routinely used during machine experiments. In this proceeding we present different beam based measurements showing dynamic vacuum effects. The non-linear dependence of the extraction intensity on the number of injected particles, ramp rate, and brake-time for vacuum relaxation will be shown. Stored heavy ion beams were used for charge exchange current measurements. They allow conclusions on the vacuum conditions and are presented as well. 6G14 - GSI-MU Ion Facilities (POF4-6G14) G:(DE-HGF)POF4-6G14 POF4-6G14 POF IV 0 Dataset connected to DataCite Accelerator Physics Other mc4-hadron-accelerators - MC4: Hadron Accelerators Other MC4.A04 - MC4.A04 Circular Accelerators Other Facility_outside_beam_time_program Experiment at GSI without experiment proposal number ( - ; Facility_outside_beam_time_program ) EXP:(DE-Ds200)Facility_outside_beam_time_program-20200803 EXP:(DE-Ds200)Experiment_without_proposal_number-20200803 EXP:(DE-Ds200)Experiment_without_proposal_number-20200803 0 Spiller, Peter P:(DE-Ds200)OR1222 1 Pilat, Fulvia 2 Editor Fischer, Wolfram 3 Editor Saethre, Robert 4 Editor Anisimov, Petr 5 Editor Andrian, Ivan 6 Editor 10.18429/JACOW-IPAC2024-TUPS13 OpenAccess http://repository.gsi.de/record/357443/files/TUPS13.pdf OpenAccess pdfa http://repository.gsi.de/record/357443/files/TUPS13.pdf?subformat=pdfa oai:repository.gsi.de:357443 openaire open_access VDB driver dnbdelivery GSI Helmholtzzentrum für Schwerionenforschung GmbH I:(DE-Ds200)20121206GSI GSI 0 P:(DE-Ds200)OR2146 GSI Helmholtzzentrum für Schwerionenforschung GmbH I:(DE-Ds200)20121206GSI GSI 1 P:(DE-Ds200)OR1222 DE-HGF Forschungsbereich Materie Großgeräte: Materie G:(DE-HGF)POF4-6G0 G:(DE-HGF)POF4-6G14 G:(DE-HGF)POF4 G:(DE-HGF)POF4-600 G:(DE-HGF)POF GSI-MU Ion Facilities 0 2024 OpenAccess StatID:(DE-HGF)0510 StatID Creative Commons Attribution CC BY 4.0 LIC:(DE-HGF)CCBY4 HGFVOC I:(DE-Ds200)SYS-20121002OR231 SYS System Design SIS 100 / SIS 18 0 contrib VDB UNRESTRICTED I:(DE-Ds200)SYS-20121002OR231 FullTexts