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Resonant Diffraction Radiation from Inclined Targets as a Tool for Bunch Lengths Diagnostics

Resonant Diffraction Radiation from Inclined Targets as a Tool for Bunch Lengths Diagnostics. L. Sukhikh 1 , G. Kube 1 , A. Potylitsyn 2 , B. Smit 3 , R. Ischebeck 3 , V. Schlott 3 1 - Deutsches Elektronen Synchrotron (DESY), Hamburg, Germany

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Resonant Diffraction Radiation from Inclined Targets as a Tool for Bunch Lengths Diagnostics

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  1. Resonant Diffraction Radiationfrom Inclined Targets as a Tool for Bunch Lengths Diagnostics L. Sukhikh1, G. Kube1, A. Potylitsyn2, B. Smit3, R. Ischebeck3, V. Schlott3 1 - DeutschesElektronen Synchrotron (DESY), Hamburg, Germany 2 - Tomsk Polytechnic University (TPU), Tomsk, Russia 3 – Paul Scherer Institute (PSI), Villigen, Switzerland

  2. Contents • Introduction • Theoretical background • Calculation results • Experiment status

  3. Introduction

  4. dispersionrelation E = 855 MeV, D = 833 nm, αblaze = 41.12° • radiation factor G.Kube et al., Phys.Rev. E 65 (2002) 056501 Smith-Purcell Radiation Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  5. longitudinal coherence long bunch (l<sz) short bunch (l>sz) Longitudinal Radiation Coherence Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  6. single particle spectrum bunch form factor with bunch profile no. of particles per bunch • transition radiation (TR), diffraction radiation (DR), • Cherenkov radiation (ChR): • - polychromatic angular distribution • Smith-Purcell radiation (SPR): • - (virtual) photon diffraction at 1D grating • - angular distribution wavelength-dependent → spectrometer for decomposition → no additional spectrometer Martin-Puplett interferometer Coherent Radiation Diagnostics • coherentradiationdiagnostics • principle:bunch length/shape dependent emission spectrum of coherent radiation • spectral decomposition and Fourier transform: • → bunch length and shape Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  7. Measurement at 45 MeV, FELIX Carousel ofGratings Quartz Window Optical System(11 pyroelectric detectors) WinstonCone G. Doucas et al., PRST 9 (2006) 092801 Experiment at 28.5 GeV, SLAC V.Blackmore et al., PRST 12 (2009) 032803 Waveguide ArrayPlate Filter Coherent SPR Diagnostics • bunch length monitor based on Smith-Purcell radiation Courtesy G. Doucas, V. Blackmore (Oxford) Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  8. Proposed RDR Experiment Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  9. Theoretical background

  10. Problem geometry Beam parameters: Energy – 165 MeV Bunch length – 70 – 250 um Bunch transverse sizes are << impact-parameter h=20 mm Grating parameters: Period – 700 um Strip – d/2 Number of periods = 21 In transverse direction the grating is infinite The grating thickness tends to zero The grating is ideally conducting The detectors are situated in the far-field zone L > 400 mm Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  11. Calculation formulae Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  12. Calculation results

  13. Incoherent Radiation Results (1) =-90 0=0 Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  14. Incoherent Radiation Results (2) 0=5 Line position vs. 0 =90 =-90 Line integral vs. 0 Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  15. Line Shift =90 =-90 Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  16. Gaussian Bunch Form-Factor =700 um =70 um =90 um =110 um =180 um Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  17. D1/D2 ratio vs. 0 Fully coherent =70 um =90 um =110 um =150 um =200 um =250 um Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  18. Experiment status

  19. Accelerator Beam parameters Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  20. Experimental Setup Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  21. Gratings 100 um thick Si wafers covered by 500 nm Mo 700 um period, 29 periods Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  22. Summary and Outlook • Simple theoretical model exists and is used for calculation of CRDR characteristics. • Experimental equipment is ready for vacuum installation, that is planned to be in the end of November 2011. • Experiments will start probably early 2012. Leonid Sukhikh, DESY / DITANET Conference / 11.11.2011

  23. Thank you for your attention!

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