Coherent photon beam based diagnostics for a seeded extreme ultraviolet free-electron laser
arXiv:1207.2616 · doi:10.1103/PhysRevSTAB.17.100702
Abstract
Independently from electron beam based procedures, photon beam based diagnostics is an alternative way for alignment and commissioning of the numerous undulator cells in a high-gain short-wavelength free-electron laser (FEL). In this paper, using the seed laser modulated electron beam and the undulator fine tuning technique, a coherent photon beam based diagnostic was proposed for seeded FEL, and some preliminary experimental results at Shanghai deep ultraviolet FEL test facility were presented. It demonstrates that the spatial distribution of the coherent harmonic radiation from one individual or two consecutive undulator segments can be used to optimize the electron beam trajectory, to verify the undulator magnetic gap, and to adjust the phase match between two undulator segments.
10 pages, 9 figures
References in corpus (7)
- First Observation of Self-Amplified Spontaneous Emission in a Free-Electron Laser at 109 nm Wavelength
- Using Off-Resonance Laser Modulation for Beam Energy Spread Cooling in Generation of Short-Wavelength Radiation
- A simple method for the determination of the structure of ultrashort relativistic electron bunches
- Fast Polarization Switching Demonstration Using Crossed-Planar Undulator in a Seeded Free Electron Laser
- Fel Oscillators with Tapered Undulators: Inclusion of Harmonic Generation and Pulse Propagation
- Simulation studies on laser pulse stability for Dalian Coherent Light Source
- Characterizing Temporal Structure of the Relativistic Electron Bunch