FRIB, East Lansing, Michigan, USA
FRIB is a heavy ion linac facility to accelerate all stable ions to the energy of 200 MeV/u with the beam power of 400 kW, which is under construction at Michigan State University in USA. FRIB driver linac is a beam power frontier accelerator aiming to realize two orders of magnitude higher beam power than existing facilities. It consists of more than 300 low-beta superconducting cavities with unique folded layout to fit into the existing campus with innovative features including multi charge state acceleration. In this talk, we overview accelerator physics challenges in FRIB driver linac with highlight on recent progresses and activities preparing for the coming beam commissioning.
WEPM3Y01
FRIB, East Lansing, Michigan, USA
NSCL, East Lansing, Michigan, USA
Particle-In-Cell (PIC) simulations of FRIB front-end are being carried out with the open-source Warp code. Near source evolution of an intense, multi-species DC ion beam emerging from a Electron Cyclotron Resonance (ECR) source is simulated in a realistic lattice. Flexible, script-based simulation tools are applied to analyze the plethora of ion cases within a maintainable and extendable framework to support front-end commissioning activities which commence in late 2016. Linked transverse xy slice and 3D simulations are carried out in the lattice downstream of the ECR to better understand species charge selection and collimation. The simulations improve understanding of the complex dynamics and augment limited laboratory diagnostics to improve optimization. Effects from large canonical angular momentum (magnetized beam from ECR) induced beam rotation, thermal spread, initial distribution asymmetries, space-charge, and varying degree of electron neutralization are examined for impact on charge selection and beam quality. Ranges of initial conditions are analyzed since the beam emerging from ECR sources is not well understood. Simulation scripts developed are made freely available.