ERL PARAMETERS FOR COMPTON POLARIZED POSITRON SOURCES
One of the main challenges for also future linear colliders projects (ILC and CLIC) is to provide an efficient positron source that takes into account the constraint imposed by the target heating in the pair production. At present, different schemes have been proposed to produce high energy gammas to be converted in e-e pairs into an amorphous target [1,2,3]. One of them considers the possibility to boost the energy of the backscattered photons of a laser pulse by Compton effect [4]. This method is particularly attractive since the source is independent of the main Linac and since the photon and consequently the produced pair helicities are conserved in the scattering event. This implies that physics will have at its disposal both positron and electron polarized sources. Different solutions have been proposed to provide the electron beam for the Compton collision. They have to take into account one of the main constraints of this proposal that is the relative low value of the Thomson cross section. One of the possibilities is to design an ERL with relatively low repetition frequency and high charge per pulse and then to stack the produced positrons in an accumulation ring. Different considerations on this scheme will be illustrated and the main constraints discussed.
Novel Radiation Sources Using Relativistic Electrons: From Infrared to X-Rays
The purpose of this text is to give a description of the state of art in theoretical and experimental work achieved in radiation source development. It summarizes the basic physical aspects needed to understand the phenomena, and also provides sufficient literature to be able to follow the development in more detail. In addition, the text contains a unified view of mosts theoretical effects and ther common properties. Recent developments as well as references to further work can also be found in this volume, and in many cases, review articles and texbooks published in specialized areas are incorporated into the text.
Design Considerations for the CLIC pre-damping rings
The CLIC pre-damping rings (PDR) have to accommodate a large emittance beam, coming in particular from the positron target and reduce its size to low enough values for injection into the main damping rings (DR). The lattice design is based on theoretical minimum emittance (TME) arc cells and long straight sections filled with damping wigglers. Lattice design optimisation considerations are presented with emphasis to the linear optics functions, tunability, chromatic properties and acceptance. A complete phase advance scan of the TME cells is undertaken for reducing the non-linear resonance driving terms and amplitude dependent tunespread and maximizing the ring’s dynamic aperture (DA).