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Highlights of Beam Diagnostics at DESY FLASH or What I did during the Hurricane

Highlights of Beam Diagnostics at DESY FLASH or What I did during the Hurricane. 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 m m

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Highlights of Beam Diagnostics at DESY FLASH or What I did during the Hurricane

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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

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

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  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

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  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

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  35. Scarpine, Instrumentation Meeting

  36. Coherent Radiation Diagnostics Scarpine, Instrumentation Meeting

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