Abstract
We discuss the inverse free electron laser (IFEL) scheme as a compact high gradient accelerator solution for driving advanced light sources such as a soft x-ray free electron laser amplifier or an inverse Compton scattering based gamma-ray source. In particular, we present a series of new developments aimed at improving the design of future IFEL accelerators. These include a new procedure to optimize the choice of the undulator tapering, a new concept for prebunching which greatly improves the fraction of trapped particles and the final energy spread, and a self-consistent study of beam loading effects which leads to an energy-efficient high laser-to-beam power conversion.
Highlights
The interaction of an electron beam and a laser within an undulator is the subject of numerous studies in recent accelerator and beam physics as it allows particle accelerators to benefit from the tremendous progress achieved by laser technology
Energy is extracted from the radiation and transferred to the electrons, and it is customary to refer to the system as an inverse free electron laser (IFEL)
The IFEL is perfectly suited as a driver for applications like soft x-ray free electron laser amplification [11] and the production of gamma rays by inverse Compton scattering (ICS) [12]
Summary
The interaction of an electron beam and a laser within an undulator is the subject of numerous studies in recent accelerator and beam physics as it allows particle accelerators to benefit from the tremendous progress achieved by laser technology. The IFEL is perfectly suited as a driver for applications like soft x-ray free electron laser amplification [11] and the production of gamma rays by inverse Compton scattering (ICS) [12] In the latter case, a significant advantage comes from the fact that the high power laser system for the ICS source can be shared and used to drive the IFEL accelerator. A significant advantage comes from the fact that the high power laser system for the ICS source can be shared and used to drive the IFEL accelerator Driven by these applications, the interest in IFEL accelerators has sparked again in recent years with various experiments planned to demonstrate the extension of the IFEL to the 100 MeVenergy range [13,14].
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