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Overview of PETAL, the multi-Petawatt project on the LIL facility

Overview of PETAL, the multi-Petawatt project on the LIL facility N. Blanchot , G. Behar, T. Berthier, E. Bignon, F. Boubault, C. Chappuis, H. Coïc, C. Damiens Dupont, J. Ebrardt, O. Flour, Y. Gautheron, P. Gibert, O. Hartmann, E. Hugonnot, F. Laborde, D. Lebeaux, J. Luce,

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Overview of PETAL, the multi-Petawatt project on the LIL facility

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  1. Overview of PETAL, the multi-Petawatt project on the LIL facility N. Blanchot, G. Behar, T. Berthier, E. Bignon, F. Boubault, C. Chappuis, H. Coïc, C. Damiens Dupont, J. Ebrardt, O. Flour, Y. Gautheron, P. Gibert, O. Hartmann, E. Hugonnot, F. Laborde, D. Lebeaux, J. Luce, S. Montant, S. Noailles, J. Néauport, D. Raffestin, A. Roques, F. Sautarel, M. Sautet, C. Sauteret and C. Rouyer CEA-CESTA DLP Bordeaux - France

  2. Institut Lasers & Plasmas Context PETAL is dedicated to academic research : • Conducted under the responsibility of the Aquitaine Region • Under the scientific supervision of ILP • Realized by CEA/CESTA • First step for the HiPER project

  3. Objectives of PETAL Project TO LINK HIGH ENERGY LASER LIL WITH A MULTI-PETAWATT CLASS LASER IN THE SAME EXPERIMENTAL CHAMBER 30 kJ / 1 quad and later 60 kJ / 8 beams ns , 3w 3.5 kJ 500 fs – 10 ps up to 7 PW

  4. PETAL : specifications • Energy > 3 kJ, • Pulse duration between 0,5 and 10 picoseconds, • Intensity on target > 1021 W/cm², • Intensity contrast (short pulse) : 10-7at -7 ps, • Energy contrast (long pulse) : 10-3.

  5. Implementation of PETAL in the LIL Facility Target bay (HE-LIL) Laser bay (HL-LIL) Compression Stage in an independent room (Petawatt-SCF room) Independent PETAL PW Beam

  6. PETAL Project Schedule Phases II and III full power independent PW beam  Phase IV Coupling to LIL Phase I Key issues Front End Compression - Stage Amplifier Section Transport Focusing August 2005 – August 2008 December 2007 – mid-2011 2009 – end 2011

  7. Phase 1 : Front-End and Compression • Phases 2 and 3 : Amplifier Section • Phase 4 : Focusing • PETAL in the LIL facility

  8. Front-End Architecture* : OPCPA Technique Short pulse oscillator Temporal stretching Pre-amplification Pump laser * E. Hugonnot, Appl. Opt. 45, 377-382 (2006)

  9. Experimental results => Validation of the architecture

  10. Pulse duration, beam shaping • Pulse compression measurement : autocorrolation trace • 400 fs ≈ 380 fs (Fourier limited) • Principle : phase mask + spatial filtering • Pixel 16mmx16mm Mask structure Beam shaping

  11. Integration of the PAM OPCPA side Pump side 71 mJ Pump 2 700 mJ

  12. Grating issue : Damage Threshold Compression of 3.6 kJ energy Fluence requirement : 3 J/cm² (right section) 400 x 400 mm² beam (337 x 337 mm² equivalent square) MLD gratings Incident angle : 77.2° grating size : 400 x 1800 mm² LLNL segmented mosaic grating (mosaic of 2 or 4 gratings) or Segmented beams (2 or 4 sub-beams)

  13. PETAL compression scheme vacuum 1780 t/mm 77,2° - 2 m

  14. PETAL compression scheme* Output : 3,6 kJ - 500 fs Segmented mirror : 4,4 kJ - 350 ps Vacuum 1780 t/mm 77,2° - 2 m Spatial profile in the front-end intput : 6,4 kJ – 1,7 ns Air 1680 t/mm 56° - 2x 2,62 m *N. Blanchot et al., Appl. Opt. 45, 6013-6021 (2006)

  15. PETAL Compression Stage Set – Up* Pulse duration : 500 fs (min) to 10 ps * N. Blanchot, Appl. Opt. 45, 6013-6021 (2006)

  16. Compression box and mechanical supports

  17. Grating Developments Grating developments : - tests on small samples with DERIC* - MLD : |E|² control, mixed MLD** • Installation on ALISE facility : • Test conditions : • 500 fs, up to 6 J/cm², 5 Hz • Air , hygrometry 11% • Polarisation : S (TE) or P (TM) *J. Néauport, Opt. Express, vol 15, issue18, August 2007 **N. Bonod, Optics Com, Vol 260, Issue 2, pp 649-655, 2006 J. Neauport et al, Optics Express Vol. 15, 18, 2007

  18. Grating components Jobin-Yvon LLNL

  19. Compressor alignement : synchronisation and phasing Energy Multi-spots Step 1 : Spatial Observation of the beam pointing on focal spot Energy Multi-pulses Piston error (modulo 2 p) Step 2 : Temporal Synchronisation with Spectral Interferometry Energy Aberration for p phase error Piston error (modulo 2 p) Step 3 : Spatial Piston and tilts with the SID4 Energy Single spot Piston nul (modulo 2 p)

  20. Synchronization : Spectral Interferometry PETAL : synchronization at 50 fs with 8 nm, sub-apertures, Longitudinal and transverse chromatisms Tsynch. Tsynch. Fringes number: Grating a Cylindrical lens Wavefront Image on the CCD Spectrometer Delay = 2 ps Slit

  21. Image on the CCD Cylindrical lens Wavefront Delay = 50 fs Spectrometer Slit Bi-prismatic optic Delay = 3 ps PETAL : 2D- Spectral Interferometry PETAL : synchronization at 50 fs with 8 nm, sub-apertures, Longitudinal and transverse chromatisms

  22. CCD plane Modified Hartmann mask Light Beam phasing : SID4 Phasics Multiwave shearing interferometry already works for phase step metrology : SID4 = 4 waves

  23. Phase 1 : Front-End and Compression • Phases 2 and 3 : Amplifier Section • Phase 4 : Focusing • PETAL in the LIL facility

  24. Laser bay of the LIL facility PETAL PW beam LIL

  25. PETAL amplifier section LIL → PETAL : 4 x 2 → 1 x 1 Servitudes SAHA Amplifiers EMM Mechanical supports CROCO

  26. Design of the mechnical elements of the amplifier section

  27. Design of the amplifier

  28. Phase 1 : Front-End and Compression • Phases 2 and 3 : Amplifier Section • Phase 4 : Focusing • PETAL in the LIL facility

  29. Control of the sub-beams phasing* Time evolution of the focal spot : pistons of 230 nm, tilts of 1µrad Time evolution during 750 fs Focal spot intensity Spot : objective 20 to 30 µm Segmented mirror for the sub-beams phasing • * S. Montant, Opt. Express 14, 12532-12545 (2006)

  30. Target Hall of the LIL facility Quad-LIL PETAL

  31. Focusing configuration : top view Parabola Quad LIL

  32. Phase 1 : Front-End and Compression • Phases 2 and 3 : Amplifier Section • Phase 4 : Focusing • PETAL in the LIL facility

  33. Compressor room Without PETAL With PETAL

  34. May 2007 Mounting of the main support March - April 2007 Mounting of the clean room

  35. July 2007 Fixation for tables and compressor box Installation of tables

  36. August- September 2007

  37. October – November 2007

  38. End 2007 –12 months of work …

  39. End 2007 – beginning 2008 : air conditionning / vacuum

  40. Vacuum : 3,2 10-6 mbar

  41. 1st quarter 2008 : Mechanics and optics mounting (80%)

  42. Institut Lasers & Plasmas In collaboration with : CEA/CESTA CEA / DSM / DRECAM CEA / LITEN

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