JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - UNPB AU - Oeftiger, A. AU - Boine-Frankenheim, O. ED - Cai, Yunhai ED - Nagaitsev, Sergei ED - Kim, Dong Eon ED - Marx, Michaela ED - Schaa, Volker R. W. TI - Space-charge Limits and Possible Mitigation Approaches in the FAIR Synchrotrons J2 - Proc. of HB2023, Geneva, Switzerland, 09-13 October 2023 CY - Geneva, Switzerland T2 - ICFA Advanced Beam Dynamics Workshop on High-Intensity and High-Brightness Hadron Beams T3 - 68 LA - english AB - To fully exploit the potential of the new Facility for Antiproton and Ion Research (FAIR), the key synchrotrons SIS18 and SIS100 should be operated at the "space charge limit" for light- and heavy-ion beams at a tolerable low beam loss of a few percent per cycle. A detailed 3D tracking model with collective effects (space charge and impedance) has been established including a realistic magnet field error model and the Landau Damping octupoles. The error model for SIS100 is based on precise bench measurements of the main magnets, the one for SIS18 on a novel data-driven beam-based approach named Deep Lie Map Network. Simulations of the full one-second SIS100 accumulation plateau determine the maximum achievable bunch intensity and the corresponding low-loss working point region. Several mitigation approaches have been scrutinised for their impact on the space charge limit: beta-beat correction to suppress the half-integer resonance, bunch flattening via double harmonic RF, and pulsed electron lenses (e-lenses). An optimum configuration for pulsed e-lens operation has been determined, options for additional coherent stabilisation as a Landau damping e-lens are currently studied. PB - JACoW Publishing CP - Geneva, Switzerland ER -