WE3D —  Working Group D: Key Technologies   (30-Aug-23   14:00—16:00)
Chair: J.A. Clarke, STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
Paper Title Page
WE3D1
 Femtosecond Synchronization of Large Scale FELs - Achievements, Limitations and Mitigation Paths  
 
  • H. Schlarb, M.K. Czwalinna, S. Schulz
    DESY, Hamburg, Germany
  
  Over the past decade, synchronization of large-scale accelerators has advanced from picosecond stability reaching nowadays few femtoseconds only. Driver behind these developments are Free-Electron Lasers, requiring high electron beam compression factor for lasing and the production of ultra-short photon pulses for precision time-evolution experiments in pump-probe laser arrangements. The high control demand of FELs on their electron beam phase space and arrival time triggered a series of key technology development in the accelerator community. These developments span for state-of-the-art RF components, pushing the limits on precision RF cavity control, ultra-stable optical reference distributions to novel new beam diagnostic techniques, all aiming to reach femtosecond beam and pump-probe stabilities. In this presentation, an introduction to key elements causing beam arrival time instabilities and synchronization losses is given. Using EuXFEL and FLASH at example, achievable performance with currently available technologies are summarized. Limitations towards single digit femtosecond or even attosecond synchronization are discussed together with possible mitigation paths.  
slides icon Slides WE3D1 [7.362 MB]  
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WE3D2
 Advanced Electron Beam Diagnostics for FELs  
 
  • P. Krejcik
    SLAC, Menlo Park, California, USA
  
  The critical electron beam instrumentation needs for FELs are identified - high-resolution beam position and alignment, emittance and energy spread, and longitudinal profile measurements. The performance limitations for each are discussed and state-of-the-art techniques from several FEL light source facilities will be presented. New challenges for integrating instrumentation in SC undulators are also addressed. A survey of proposals for advanced techniques will be included, especially those focusing on sub-fs resolution for longitudinal measurements and synchronization for attosecond science.  
slides icon Slides WE3D2 [4.554 MB]  
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WE3D3
 Beam Diagnostics for Ultra-low Emittance Storage Rings  
 
  • V. Schlott
    PSI, Villigen PSI, Switzerland
  
  Multi-bend achromat (MBA) lattices have enabled the realization of ultra-low emittance storage rings as diffraction-limited synchrotron radiation sources providing much higher photon brilliance and coherence in the wavelength range of hard x-rays than third generation user facilities. While advances in technology and continuous upgrading of state-of-the-art diagnostics systems have already led to outstanding performance levels of beam instrumentation at the present generation of light sources, more stringent demands on beam stability and control induce a number of technical improvements and stimulate advanced concepts of combining electron and photon beam-based signals. Based on diagnostics requirements for diffraction-limited light sources, this talk will give an overview of new electron and photon beam instrumentation developments and highlight beam stabilization concepts aiming for the exploitation of the full capacity of fourth generation synchrotron radiation user facilities.  
slides icon Slides WE3D3 [3.746 MB]  
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