1 Abstract Interaction of external monochromatic, linearly polorized plane EM-wave with nonlinear one-dimensional wake wave, generated by relativistic electron bunch moving in cold plasma, is considered. At definite conditions on parameters of plasma and bunch, nonlinear wake wave can have a pronounced spikes, where plasma electron density has its maximum value and plasma electron velocities ar...

We present the effects of the filling pattern structure in multi-bunch mode on the beam spectrum. This effects can be seen by all detectors whose resolution is better than the RF frequency, ranging from stripline and Schottky measurements to high resolution synchrotron radiation measurements. Our heterodyne measurements of the emitted coherent synchrotron radiation at 270GHz reveal discrete fre...

Damping Ring performance depends on the ability to store the design beam current, and extract the beam with the specified low transverse emittance. Given the high bunch charge and moderate energy, a variety of collective effects could play a significant role, in either limiting the bunch current, or increasing the emittance. Here, we estimate the consequences of various effects, based on curren...

Model Independent Analysis (MIA) has shown the potential to be a useful tool for diagnostics and optics verification. The Accelerator Test Facility (ATF) prototype damping ring at KEK has a diagnostic system with the ability to collect data allowing the application of MIA for analysis of the injection stability, and the storage ring optics and diagnostics. Understanding of all these issues will...

The E162 experiment at the Stanford Linear Accelerator Center was the first experiment in which a positron beam gained energy in a plasma wakefield accelerator [1]. A single positron bunch both excited (gave energy to) and witnessed (extracted energy from) the plasma wakefield. The energy dynamics within the single positron bunch were measured in a dispersive section of the beamline with both t...

The control and stabilization of RF systems for accelerators are of considerable importance. In case of high-gain free-electron lasers (FEL) with magnetic bunch compressors, the RF phases determine the attainable bunch peak current, which is a relevant parameter for driving the FEL process. In order to measure the bunch peak current in a simple and fast but indirect way, both bunch compressors ...

We extend a recently introduced mapping model, which explains the bunching phenomenon in an ion beam resonator for two ions [Geyer, Tannor, J. Phys. B 37 (2004) 73], to describe the dynamics of the whole ion bunch. We calculate the time delay of the ions from a model of the bunch geometry and find that the bunch takes on a spherical form at the turning points in the electrostatic mirrors. From ...

A femtosecond single-bunch electron linear accelerator based on a photocathode rf gun was developed in Osaka University for the study of radiation-induced ultrafast physical and chemical reactions. A 32 MeV single electron bunch with bunch length of 98 fs in rms was generated successfully with a magnet bunch compressor, and was used as pump source to study the electroninduced ultrafast reaction...

Most plasma physics experiments that use ion beam heating need short bunches. To accommodate this requirement the RF system in the SIS is used to produce a single compressed ion bunch. Typical examples of such bunches were recorded in two beamtimes at the HHT experimental area in 2009 and are shown in Fig. 1. The bunch form is measured by a fast current transformer in the beamline. The bunch ha...

Dynamic focusing of a 3.8 MeV, 25 ps long, full width at half-maximum (FWHM), electron bunch by an overdense (n,+nb, where np and nb are the plasma and bunch densities, respectively) plasma lens has been studied experimentally. The plasma focused the bunch from an initial transverse size of approximately 2.4 mm (PWHM) to about 0.5 mm, 21 cm downstream of the plasma. The sharp rise time (7 ps lo...