THADC3
MSU, East Lansing, Michigan, USA
Fermilab, Batavia, USA
FFAGs are being considered for various new classes of accelerators, including proton drivers for muon colliders and neutrino factories, for accelerator driven subcritical reactors, and for medical applications. Their key advantages are compactness, CW operation and large acceptance. However, due to the complicated field arrangements, beam dynamics simulations are challenging for conventional simulation codes. Among various levels of sophistication of dealing with beam elements, one of the most advanced modes of the code COSY INFINITY computes the 3D field distributions along the trajectory of the particles, not only at the point of interest but also in the neighborhood with functional dependencies, using DA PDE solvers based on Differential Algebraic techniques. The scheme allows the code developer and user to describe rather complicated field arrangements with rather limited effort. Of particular advantage is the seamless integration with map-based symplectic tracking schemes. The methods are illustrated in design studies of FFAGs for various different machine types, including both conventional strong focusing and continuously varying combined function setups.
