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In-Air X-ray detectors a new field of extremely simple and powerful beam diagnostics

In-Air X-ray detectors a new field of extremely simple and powerful beam diagnostics BIW06 Fermilab 1-4 May 2006 Kees Scheidt ESRF. = 155W/mrad. 40mm Cu & 5mm Fe. a tiny fraction (~2 . 10 -6 = 300uW/mrad) traverses the crotch : Xrays >150KeV. Ec=20KeV. this device.

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In-Air X-ray detectors a new field of extremely simple and powerful beam diagnostics

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  1. In-Air X-ray detectors a new field of extremely simple and powerful beam diagnostics BIW06 Fermilab 1-4 May 2006 Kees Scheidt ESRF

  2. = 155W/mrad 40mm Cu & 5mm Fe a tiny fraction (~2.10-6 = 300uW/mrad) traverses the crotch : Xrays >150KeV

  3. Ec=20KeV this device X-rays IR Vis.

  4. 200 KeV

  5. Side-View i.e. in the vertical plane of the beam

  6. horizontal Vertical profile vertical measurement time = 1 millisec

  7. 2 types of In-Air X-ray detectors : Electric : Lead-Blade-BPM Imaging : scintillator +optics +camera

  8. In-Air Lead-Blade-monitor for Vertical Beam Motion (Bv=35m) installed behind crotch of Cell 5

  9. I [upto uA] +50V

  10. ~1000um ~130um fwhm ~1000um

  11. B V D C A E um

  12. > 1uA P +50V What is creating this current ? In : Xray = 1011 photons/sec Out :1uA= 1013 electrons/sec Showers of secondary particles, created themselves by the interaction of X-photons with Lead, cause the air-particles to ionise. P V

  13. I S +50V vertically adjusted so that Upper Blade intercepts ~50% of the X-ray beam : detector with extreme sensitivity to vertical beam motion S

  14. limited linearity range (about +/- 20um) [V] multiple 10um steps t [sec]

  15. In-Air X-ray detectors BIW06, FermiLab, May1-4 Conclusions : Lead-Blade-Monitor : analysis after cross-comparison with other diagnostics (classical X-BPMs, CO-BPMs, F-BPMs, and ID-25-fast) : more performance . . . for much less complexity !! if installed behind a large number (16, 32, 64max.) of crotches they would form an excellent global vertical stability monitor system for both DC and AC. 8 installations foreseen in 2006 (for survey purposes only) In 2007 possibly more installations and integration into the global feedback system.

  16. Why are In-Air X-ray detectors so powerful ? : • Excellent conversion efficiency of the detector material : • - CdWO4 for the Imaging devices • - Lead,Tungsten or Gold for the Blade-Monitor • 2) They touch the heart of the beam, • other diagnostics can not reach there and get • much smaller signal from the edges or tails • 3) The 6GeV ESRF has nice crotches !! (40mm is not too thick) But can they find application in medium energy light sources ??

  17. emitted Hard X-rays : Flux comparison 6 GeV ESRF with Soleil & Diamond ESRF dipole Soleil Diamond 200KeV

  18. ANKA 2.5 GeV Karlsruhe Germany

  19. ANKA 2.5 GeV Karlsruhe Germany

  20. ANKA Peak Energy at 80KeV ANKA 2.5 GeV Karlsruhe Germany ESRF Peak Energy at 170KeV 2E-6=300uW/mrad 1E-7=3.4uW/mrad

  21. vertical profile ANKA 2.5 GeV Karlsruhe Germany

  22. ANKA 2.5 GeV Karlsruhe Germany

  23. ESRF TransferLine2 6 GeV 5mA 1us

  24. beamsize ~130um fwhm beamsize ~430um fwhm ESRF TL-2 Xrays-In-Air d~2m, ~10mm Fe E~75KeV ph.div.~66urad I=5mA, 1uS Vertical profiles for different quadrupole currents

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