Fast Moment Method for Beam Line Simulations

Dr. Toon Roggen, CERN

7 Jul 2014, 16:15–17:45; Location: S2|17-103

Particle accelerators are among the most complicated contemporary devices and consist of a large number of components, each with a specific function. All components need to be tuned with respect to each other to achieve the prescribed particle beam characteristics. Seemingly small deviations from an individual component's design specifications may induce irreversible aberration from the particle beam characteristics in subsequent accelerator components. Therefore both fast and accurate beam dynamics simulations of the accelerator as a whole are indispensable during design and operation of a particle accelerator. V-Code is a beam dynamics simulation code based on the moment method and the Vlasov equation, and has the ability to take into account electromagnetic field distributions obtained from Finite Element (FE) and Finite Difference Time Domain (FDTD) simulations. These surrogate field models improve the beam dynamics model set-up significantly. For extraction of accurate and reproducible surrogate field models from the 3D electromagnetic field simulation results, standardised procedures are developed for radio frequency (RF) cavities, solenoids, steerer magnets, Wien filters, dipole magnets, quadrupole magnets, sextupole magnets and octupole magnets.

Furthermore V-Code, initially being developed for electrons, is extended for the more general case of particles with an arbitrary charge and mass. From 3D electrostatic field simulation results of Radio Frequency Quadrupoles (RFQs) surrogate field models dedicated to the RFQ's radial matcher cells, transition cells and cells for particle bunching, focussing and acceleration are derived. Their accuracy and robustness is validated thoroughly, both with theoretical and realistic RFQ models. The four-rod RFQ design for the 600 MeV proton accelerator as a segment of the MYRRHA research reactor, planned at SCKCEN, was employed as a realistic RFQ validation model. The surrogate field models are implemented into the Vlasov solver. The extended Vlasov solver combined with the accurate surrogate field models calculates the beam dynamics in an RFQ in a few seconds, making the solver a valuable tool for the design and operation of RFQs.

Category: CE Seminar


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