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Laser-wire Update

Laser-wire Update. Grahame Blair CLIC Technical Board CERN 29 th June 2010. Commissioning of the PETRA3 Laser-wire Summary of first ATF-ext laser-wire Installation of ATF2 laser wire. www.pp.rhul.ac.uk. The RHUL Team. Academics. Grahame Blair Laser-wire, BDSIM, …

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Laser-wire Update

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  1. Laser-wire Update Grahame Blair CLIC Technical Board CERN 29th June 2010 • Commissioning of the PETRA3 Laser-wire • Summary of first ATF-ext laser-wire • Installation of ATF2 laser wire www.pp.rhul.ac.uk

  2. The RHUL Team Academics • Grahame Blair • Laser-wire, BDSIM, … • Stewart Boogert • Laser-wire, low-Q BPM, ATF2… • Pavel Karataev • CDR, CTF3, ATF2 … • Stephen Molloy • RF Simulation, RTML, ATF2… CLIC-related activities PhD students • Robert Ainsworth • RF Simlation, • Thomas Aumeyr • Laser-wire • Nirav Joshi • BPM • Konstantin Lekomtsev • CDR/CTF3 • Maximilian Micheler • CDR/CTF3 • + 2 others to join this year Post-Doctoral RAs • Alessio Bosco • Laser-wire • (Anne Dabrowski) • CTF3, … • Lawrence Deacon • Laser-wire, BDSIM • (Alexey Lyapin) • Laser-wire, BPM, ATF2, …

  3. Laser-wire People DESY : V. Gharibyan, S. Schreiber, K. Wittenburg, K. Balewski JAI@Oxford: B. Foster, N. Delerue, L. Corner, L. Nevay, R. Walczak JAI@RHUL:,T. Aumeyr, G. Blair, S. Boogert, G. Boorman, A. Bosco, L. Deacon, P. Karataev KEK: A. Aryshev H. Hayano, K. Kubo, N. Terunuma, J. Urakawa

  4. PETRA II

  5. PETRAII Detector • Requirements for detector material • short decay time (avoid pile up) • short radiation length • small Moliere radius • Cuboid detector crystals made of PbWO4 • 3x3 matrix of 18x18x150 mm crystals • Energy resolution better than 5%

  6. 66 ps 60 ps Q-switched, unseeded Laser Longitudinal Profile • Example of a single shot measurement of the profile500 ps window, resolution 5 ps

  7. Laser Temporal Profile Unseeded Seeded

  8. Laser Pointing Jitter Translates to longitudinal so not relevant Translates into a 1.6 m jitter at the LW IP for Both horizontal and vertical scans

  9. PETRAII Results: Vertical Convoluted profile (takes<50s) Fit to Rayleigh formula

  10. PETRAII Results: Horizontal Convoluted profile Fit to Rayleigh formula

  11. PETRAIII Laser-Wire Installed early 2009 Easy initial commissioning Currently have Laser problems

  12. PETRAIII Laser-wire

  13. PETRAIII Laser-wire Breadboard layout Raw scan

  14. ATF-ext Laser-wire

  15. ATF Laser-Wire Aiming at micron-scale vertical scans

  16. Layout in ATF Extraction line

  17. ATF2 Detector

  18. Effect of Optical Aberrations Where we were running optimum

  19. Pulsed laser performance Profile scans (shows astigmatism) Temporal scans (shows laser pulse length)

  20. Simple Gaussian Fit

  21. Laserwire principle

  22. Systematic Effects: Fit methods  Important to know beam aspect ratio

  23. ATF2 Laser Infrastructure installation • Large laser room on ATF2 shield blocks • Facility for future users • 6 m optical table • Temperature stabilised • Seismic safe

  24. ATF2 Laser Tests Tasks completed: Check laser working (sorted out cooling) – very good Started work on software for DAQ and experiment control Set up temperature logging around laser hut Aligned cw laser into tunnel and through laser-wire IP Completed laser pulse duration measurements Started laser spatial quality measurements Laura Corner Laurie Nevay Stewart Boogert Alex Aryshev (KEK) Interferometric autocorrelation Intensity autocorrelation

  25. Mode-Locked Oscillator Fiber Amplifier Fiber Core 30 m Diode Pump Pw = 12W Pulse Picker RHUL Mode-Locked Laser Current Status Pulse duration: 10 ps Pulse energy: 15 nJ Pulse power: 1.5 kW Repetition rate: 62.5 MHz Average power: 1 W Pulse duration: 10 ps Pulse energy: 10 nJ Pulse power: 1 kW Repetition rate: 1 MHz Average power: 10 mW Possible Improvement Pulse duration: 10 ps Pulse energy: 180 nJ Pulse power: 18 kW Repetition rate: 62.5 MHz Average power: 12 W Pulse duration: 10 ps Pulse energy: 500 nJ Pulse power: 50 kW Repetition rate: 1 MHz Average power: 500 mW

  26. Current Status PETRAII showed good results for an accelerator ring LW PETRAIII laser wire installed and commissioning has Started; however there are currently laser problems ATF-ext: Proof of principle for a BDS LW ATF2 LW has been installed and attempts at signal observation have so far been unsuccessful; there is a very long path for photon extraction (electron extraction not relevant due to relatively small Compton energy loss) Laser R&D ongoing at both RHUL and Oxford; fibre lasers are being actively developed and tested. (Funding issues beyond March 2011).

  27. Relevant Publications • Theory/emittance extraction: • Phys. Rev. ST Accel. Beams 10, 112801 (2007) • PETRAII laser-wire: • Nucl.Instrum.Meth.A592:162-170,2008 • ATF Laser-wire: • Proc. PAC09 A. Aryshev et al. • (PRST-AB in preparation) • Possible fast scanning system based on EO: • Applied Physics Letters 94, 1 (2009)

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