Optics and beam transport in energy recovery linacs

Abstract

Here, we report on the working group ''Optics and Beam Transport'' of the 2005 Energy-Recovery-Linac Workshop. This workshop also had working groups on ''Electron Guns and Injector Designs'', ''Superconducting RF and RF Control'', and ''Synchronization and Diagnostics/Instrumentation''. Here, we are concerned with the many different ERL proposals that international laboratories have been working on. Subjects of concern are optics, accelerator design and modeling, stability requirements, designs of the merger that connects the conventional injector linac with the Energy Recovery Linac, longitudinal phase space manipulations to produce short pulses, beam dynamics and limitations by beam instabilities, and computational aspects of space-charge and synchrotron radiation effects. A coarse grain overview is given and reference is made to more detailed articles that were presented in this working group. Subjects are identified where collaborations should be encouraged and areas of future R&D are prioritized.

Synchrotron radiation: A continuing revolution in X-ray science—Diffraction limited storage rings and beyond

“…Conveniently a linear accelerator might be combined with two arcs as indicated in Fig. 7, [13] even enabling multiple passes through the same linear accelerator structure (with multiple arcs [14]). …”

Nonequilibrium electron rings for synchrotron radiation production

“…Low-energy ERLs may circulate large currents without the strong intrabeam scattering (IBS) that would limit the emittance of a storage ring at the same energy [36,37]. At sufficiently large electron energies ERLs gain an emittance advantage over that possible from a storage ring.…”