Speaker
Description
The HIRFL-SSC employs a resonance free extraction method. In the h=4 mode, the larger turn separation allows for single-turn extraction and the extraction efficiency is high, whereas in the h=2 mode, the smaller turn separation results in lower extraction efficiency. To improve the SSC transmission efficiency, simulations were conducted to analyze the extraction efficiency and acceptance under two typical modes (h=2 and h=4). The calculations reveal that the beam size growth caused by the injection phase width is a critical factor limiting the SSC extraction efficiency. To enhance the extraction efficiency in h=2 mode, a simulation study was performed on off-equilibrium orbit injection to achieve "radial focusing" of large-phase-width ions. The simulation results demonstrate that this method can significantly improves the SSC extraction efficiency compared to the old extraction approach.
