Speaker
Description
Measurements and simulations of slowly extracted spills via tune scans at the GSI heavy ion synchrotron SIS18 were performed to study the formation of micro-structures on time scales of several 10 to 100 µs. A common technique to minimize the level of the spill micro-structure is the extraction of bunched beams. In regular operation, the bunches are built up by a ferrite-loaded rf-cavity operating at up to 5 MHz. Recently, an rf-cavity was installed, operational at about 80 MHz, to avoid the 5 MHz modulation on the extracted beam, as required by user experiments. Detailed measurements were performed using scintillator-based recordings of the particle arrival times relative to the bunch-forming rf-field. The high-frequency bunching leads to an enlarged synchrotron tune and, hence, to isolated synchro-betatron resonances, which are crossed during the tune scan for slow extraction. The resonances affect the temporal structure of the spill on time scales ranging from nanoseconds to macroscopic spill structures of about 100 ms duration. Findings are confirmed by detailed simulations using the XSuite code.
Funding Agency
This project has received funding from the European Union’s Horizon 2020 Research and Innovation programme under GA No 101004730.
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