The interference of stray electrons (also called ‘‘electron clouds’’) with accelerator beams is important in modern intense-beam accelerators, especially those with beams of positive charge. In magnetic wigglers, used, for instance, for transverse emittance damping, the intense synchrotron radiation produced by the beam can generate an electron cloud of relatively high density. In this paper th...

The holographic mask technique is used to create freely moving electrons with quantized angular momentum. With electron optical elements they can be focused to vortices with diameters below the nanometer range. The understanding of these vortex beams is important for many applications. Here, we produce electron vortex beams and compare them to a theory of electrons with topological charge. The ...

SYTL 1.1 Fri 11:00–11:30 C/gHS Optical curl forces and beyond — ∙Michael Berry SYTL 1.2 Fri 11:30–12:00 C/gHS Quantum memories for twisted photons — ∙Elisabeth Giacobino, Julien Laurat, Dominik Maxein, Lambert Giner, Lucile Veissier, Adrien Nicolas SYTL 2.1 Fri 14:30–15:00 C/gHS Electron vortex beams: Twisted matter waves — ∙Peter Schattschneider SYTL 2.2 Fri 15:00–15:30 C/gHS Inelastic effects...

In the TESLA linear collider, two interaction regions are foreseen, one for ee collisions at zero crossing-angle, and the other one for ee , e e or collisions at about 40 mrad crossing angle. Beam switchyards must therefore be designed after the electron and positron(or electron) linacs to switch the electron and positron (or electron) beams and serve the two interaction regions. On the electro...

Energy recovery linacs (ERLs) are potential candidates for the high power and high brightness electron beams sources. The main advantages of ERL are that electron beam is generated at relatively low energy, injected and accelerated to the operational energy in a linac, and after the use is decelerated in the same linac down to injection energy, and, finally, dumped. A merging system, i.e. a sys...

Based on an analysis of a specific electron trajectory in counterpropagating beams, Bell & Kirk (PRL 101, 200403 (2008)) recently suggested that laboratory lasers may shortly be able to produce significant numbers of electronpositron pairs. We confirm their results using an improved treatment of nonlinear Compton scattering in the laser beams. Implementing an algorithm that integrates classical...

An outline of the present and future long-baseline neutrino facilities with emphasis on the possibilities at CERN is presented. Accelerator-made neutrinos for long-baseline oscillation experiments open the exploration to a broad and rather interesting field of physics experiments, with the measurement of the neutrino mixing angle (θ13), the determination of the sign of neutrino mass hierarchy (...

Low energy (5300 keV) electron cooling is a well-developed technology. In the past 5 years, 8 systems have been commissioned in the U.S. (I), Europe (6)) and Japan (1). We believe that intermediate-energy electron cooling, in the electron energy range of 110 MeV for cooling 2-20 GeV/nucleon ion beams, would be exploited on a similar scale if the technology were available. Above electron energie...

The Stanford Linear Collider was designed to operate with round beams [ 11; horizontal and vertical emittance made equal hi the damping rings. The main motivation was to facilitate the optical matching through beam lines with strong coupling elements like the solenoid spin rotator magnets and the SLC ales. Tests in 1992 showed that ‘flat’ beams with a vertical to horizontal emittance ratio of a...

The field of radiation emission from electron beams is reviewed with special reference to work related to free-electron lasers. Different schemes o f interaction in periodic structures, electromagnetic slow-wave structures, and in transverse confining force are distinguished. Various effects and devices such as traveling wave amplifiers, Smith-Purcell radiators, Cerenkov and bremsstrahlung-free...