Oliver Boine-FrankenheimSIS100-4: High current beam dynamics studies SIS 100 ‘high current’ design challenges o Beam loss in SIS 100 needs to be carefully quantified within 1% level o ‘Non-standard’ beam and machine parameters: Space charge tune shift -∆Q= during accumulation for 1 s (10 5 turns) The beam fills more than 1/2 of the elliptical beam pipe at injection Superconducting magnets with nonlinear field components Intrabeam and residual gas scattering for U 28+ beam ions High beam intensity and low momentum spread: tight impedance budget Electro-magnetic interaction with many ‘non-standard’ ring components Finally: bunch compression with extreme ∆Q for a few turns.

Oliver Boine-FrankenheimSIS100-4: High current beam dynamics studies Tasks: o Task 1: Lattice optimization studies Code benchmarking Beam loss and collimation studies Error compensation strategies o Task 2: Collective instabilities and impedances Code benchmarking Impedance budget and feedback studies Impedance models o Task 3: Full design verification studies Accumulation, rf cycle, bunch compression GSI, Darmstadt High current beam physics group Contact: O. Boine-Frankenheim Berkeley Nat’l Lab., USA Accelerator modeling group Contact: R. Ryne Brookhaven Nat’l Lab, USA Accelerator division Contact: N. Malitsky TU Darmstadt Theorie elektromag. Felder Contact: Prof. Th. Weiland Uni. Bologna, Italy Nonlinear dynamics group Contact: Prof. G. Turchetti SIS100-4: High current beam dynamics studies Partners:

Oliver Boine-FrankenheimSIS100-4: High current beam dynamics studies Task 1: Lattice optimization Effect of space charge, field errors and noise o Long-term simulations of beam loss induced by field errors and space charge Comparison of multipole expansion (GSI) and detailed field tracking codes Benchmarking of ‘frozen’ and self-consistent space charge modules o Effect of intra-beam scattering (IBS) and other sources of noise on beam loss Comparison of different approaches to IBS in tracking codes, like Langevin forces or ‘collision-maps’. Tests with simple nonlinear maps Partners: Bologna, GSI, Berkeley Status: o Benchmarked tracking code with frozen space charge and multipole expansion (GSI). o Experience with field maps (Berkeley) o IBS modules from Bologna group and GSI-INTAS project. Schedule: o Module development, experiments and benchmarking finished after 12 month o Final report on application to SIS 100 after 18 month

Oliver Boine-FrankenheimSIS100-4: High current beam dynamics studies Task 2: ‘Impedance budget’ Space charge and impedance effects Partners: Brookhaven, GSI, TU Darmstadt o 3D simulation studies of (long-term) impedance effects in SIS 100 Comparison of impedance modules (time/frequency domain) for tracking codes For the space charge impedance: fast Poisson solvers with elliptic boundaries o Impedances studies (for all beam energies) Thin beam pipe (also with different coatings) Ferrite loaded kicker modules Combined collimation/pumping ports Status: o UAL Unified Accel. Library (Brookhaven), ‘Sliced’ 3D tracking code (GSI) o Analytic (thin wall) and numerical (kickers) impedance studies (TUD) started. o Position for SIS 100 impedance modeling announced (TU Darmstadt) o Candidate for the SIS 100 related work at Brookhaven. Schedule: o Impedance library for SIS 100 after 12 month o Report on impedance effects and impedance budget in SIS 100 after 18 month

Oliver Boine-FrankenheimSIS100-4: High current beam dynamics studies Task 3: Full design verification Partners: Brookhaven, Berkeley, GSI Joint application of the simulation tools to SIS 100 key issues: Verification of error compensation and collimation schemes Full rf cycle simulation Optimized bunch compression scenario Schedule: Final report, optimized design after 24 month