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Beam Diagnostics at DESY FLASH: Advances in Electron Bunch Measurement Techniques

This presentation explores recent advancements in beam diagnostics at DESY FLASH, focusing on the techniques employed to measure electron bunch characteristics during Hurricane Scarpine. Key highlights include the generation of 6 nm light using free electron lasers, and the measurement of transverse and longitudinal beam shapes. We delve into methods like Optical Transition Radiation (OTR), Optical Diffraction Radiation (ODR), and Electro-Optical Sampling, detailing their principles and applications. The results demonstrate high-resolution tools for understanding beam dynamics critical in accelerator physics.

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Beam Diagnostics at DESY FLASH: Advances in Electron Bunch Measurement Techniques

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  1. Highlights of Beam Diagnostics at DESY FLASHorWhat I did during the Hurricane Scarpine, Instrumentation Meeting

  2. DESY FLASH Accelerator • Free Electron Laser generating down to 6 nm light • Electron bunches of ~1 nC (~1E10 electrons/bunch) • Bunch length after compression ~ 100 femtoseconds • ~ 30 mm • Transverse beam size from few mm down to ~50 mm • Similar numbers for NML and ILC So, how do you measure these? Scarpine, Instrumentation Meeting

  3. What I’ll Talk About Transverse Shape Measurements • Optical Transition Radiation (OTR) Detectors • Optical Diffraction Radiation (ODR) Detectors Longitudinal Shape Measurements • LOLA Deflection Cavity – briefly • Coherent Radiation Spectroscopy • Electro-Optical Sampling Phase Measurements • Electro-Optic Modulator Scarpine, Instrumentation Meeting

  4. OTR Fundamentals Quantity of light proportional to foil reflectivity for reverse OTR Emission spectrum is very broad – signal in visible region Scarpine, Instrumentation Meeting

  5. Scarpine, Instrumentation Meeting

  6. Standard Optical Setup Scarpine, Instrumentation Meeting

  7. Scarpine, Instrumentation Meeting

  8. Emittance Measurements Scarpine, Instrumentation Meeting

  9. Optical Diffraction Radiation Scarpine, Instrumentation Meeting

  10. Scarpine, Instrumentation Meeting

  11. Scarpine, Instrumentation Meeting

  12. Initial Results – Last Summer Scarpine, Instrumentation Meeting

  13. Bunch Length Using LOLA • Transverse deflecting cavity • In-vacuo streak camera Scarpine, Instrumentation Meeting

  14. Coherent Radiation from Bunch The idea is… Coherent turn-on -> bunch length Spectrum -> bunch shape Scarpine, Instrumentation Meeting

  15. Scarpine, Instrumentation Meeting

  16. Scarpine, Instrumentation Meeting

  17. Scarpine, Instrumentation Meeting

  18. Scarpine, Instrumentation Meeting

  19. Scarpine, Instrumentation Meeting

  20. Scarpine, Instrumentation Meeting

  21. DESY Electro-Optic Sampling Setup Scarpine, Instrumentation Meeting

  22. Scarpine, Instrumentation Meeting

  23. Scarpine, Instrumentation Meeting

  24. Scarpine, Instrumentation Meeting

  25. Scarpine, Instrumentation Meeting

  26. Scarpine, Instrumentation Meeting

  27. Spatial Decoding • The femtosecond laser pulse is focused as a line image to the crystal and passes the crystal at an angle • The bunch length is transferred to the spatial structure of the laser • A. J. Cavalieri et al PRL 94, 114801, 2002 Scarpine, Instrumentation Meeting

  28. Spatial Decoding *Bunch offset in time artificial Work done at SLAC A. J. Cavalieri et al PRL 94, 114801, 2002 Scarpine, Instrumentation Meeting

  29. Scarpine, Instrumentation Meeting

  30. Scarpine, Instrumentation Meeting

  31. Scarpine, Instrumentation Meeting

  32. Phase Monitoring Layout Laser pulses, locked to RF of machine, are modulated by beam pickup signal. Scarpine, Instrumentation Meeting

  33. Scarpine, Instrumentation Meeting

  34. Scarpine, Instrumentation Meeting

  35. Scarpine, Instrumentation Meeting

  36. Coherent Radiation Diagnostics Scarpine, Instrumentation Meeting

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