The JAERI superconducting rf linac has been developed to produce a high-power infrared free-electron laser (FEL). So far, a stable kW-level laser output has been achieved with improvements of the electron gun, the optical resonator as well as the beam transport optics. For increasing FEL power, energy-recovery experiments are planned in the next phase of the FEL development. The lattice design ...

We studied the femtosecond dynamics of photoexcitations in films containing semiconducting and metallic single-walled carbon nanotubes (SWNTs), using various pump-probe wavelengths and intensities. We found that confined excitons and charge carriers with subpicosecond dynamics dominate the ultrafast response in semiconducting and metallic SWNTs, respectively. Surprisingly, we also found from th...

We present a method to generate a flat (large horizontal to vertical emittance ratio) electron beam suitable for Linear Colliders. The concept is based on a round-beam rf-laser gun with finite solenoid field at the cathode together with a special beam optics adapter. Computer simulations of this new type of beam source show that the beam quality required for a Linear Collider may be obtainable ...

a mathematical model is presented in the present study to control‎ ‎the light propagation in an inhomogeneous media‎. ‎the method is ‎based on the identification of the optimal materials distribution‎ ‎in the media such that the trajectories of light rays follow the‎ ‎desired path‎. ‎the problem is formulated as a distributed parameter ‎identification problem and it is solved by a numerical met...

smaller than those listed in the table. The LCLS photon pulses are expected to attain unprecedented levels of brightness and brevity in the 300400eV range. Nominally, the photon pulse length will be dominated by the electron bunch length, while the performance of conventional x-ray reflecting and bandshaping optics will be limited by : 1) peak power damage, and 2) transform-limited monochromati...

We describe a novel method for solving the twin image problem of in-line holography using a new technique for deterministic phase retrieval combined with numerical back-propagation of the reconstructed complex field. The technique presented here is applicable to any field described by the paraxial scalar wave equation, and is therefore equally applicable to X-ray, electron and neutron optics as...