Conveners
Session Beam Dynamics: Talks
- Michael Abo-Bakr (HZB)
Session Beam Dynamics: Speed talks
- Adrian Oeftiger (GSI)
To serve the diverse community at the ARD-ST 3 workshop, this presentation first introduces some key concepts of longitudinal beam dynamics before discussing the longitudinal beam dynamics at cSTART.
The compact STorage ring for Accelerator Research and Technology (cSTART) project aims to store electron bunches of laser-wakefield accelerator-like beams in a very large momentum acceptance...
During the operation of an electron synchrotron with short electron bunches the beam dynamics are influenced by the occurrence of the micro-bunching instability. This collective instability is caused by the self-interaction of a short electron bunch with its own emitted coherent synchrotron radiation (CSR). Above a certain threshold bunch current dynamic micro-structures start to occur on the...
New operation modes are often considered during the development of new synchrotron light sources. An understanding of the effects involved is inevitable for a successful operation of these schemes. At the KIT storage ring KARA (Karlsruhe Research Accelerator), new mode scan be implemented and tested at various energies, employing a variety of performant beam diagnostics devices. Negative...
Due to the exotic shape of the longitudinal phase space of electron bunches in
free-electron lasers, it is challenging to efficiently simulate their dynamics
using Vlasov methods. We present SeLaV1D, a semi-lagrangian Vlasov solver which
addresses this challenge by employing tree-based domain decomposition, and its
application to the analysis of the microbunching instability in...
Status update of the ARES construction works and results from beam commissioning.
Ultrafast Electron Diffraction (UED) is a technique used to observe dynamical changes in the structure of materials. It consists of a pump-probe scheme in which a laser pulse excites the target structure and a subsequent electron bunch scatters in the sample producing a diffraction pattern. The time resolution of MeV UED experiments is mainly governed by the electron bunch length and the time...
Slice energy spread is one of the key parameters of beam brightness for free electron laser optimizations, but its measurement is not straightforward. Two recent studies at high energy (>100 MeV) photoinjectors at SwissFEL and European XFEL have measured much higher slice energy spread than simulations, leading to the debate of necessity of laser heaters. In this report, we will show a new...
Intra-train bunch charge at FLASH shows an RMS of approx. 2 pC at 0.4 nC, with periodic oscillation that originates from within an injection laser cavity. Noticeable adverse effects on the final SASE were reported recently. The implementation of a slow and fast intra-train charge feedback is discussed. The measurement results show sub-pC charge flatness with the feed-back activated.
At the KIT storage ring KARA (KArlsruhe Research Accelerator) it is
planned to install an impedance manipulation structure in a versatile chamber
to study and eventually control the in
uence of an additional impedance on
the beam dynamics and the emitted coherent synchrotron radiation. For this
purpose the impedance of a corrugated pipe is under investigation. In this contribution,
we...
The Split Ring Resonator is a novel tool for longitudinal beam diagnostics of short bunches. The small metal device is a THz-driven resonator which creates a strong, vertical oscillating electro-magnetic field. This allows a time dependent streaking of an electron bunch with a frequency of around 300 GHz. The device is being installed and tested in FLUTE at KIT. The vertical streaking combined...
Echo-Enabled Harmonic Generation (EEHG) is an external seeding technique for Free Electron Lasers (FEL). The technique implies complex transformations of the electron beam phase space. The transformations include laser-induced energy modulations and subsequent shearing of the modulations with dispersive chicanes. The goal of the transformations is to have the electron beam pre-bunched at a...
