PETAL : a multi-pw beam on LMJ facility

Transcription

1 PETAL : a multi-pw beam on LMJ facility Retard = 50 fs Retard = 3 ps J.L. MIQUEL Experimental Validation & PETAL Projects Manager CEA,DAM, F Arpajon, France CEA 10 AVRIL 2012

2 The PETAL Project PETAL is a part of the opening policy of CEA, and it will be dedicated to the scientific community PETAL is supported by : PETAL is a step toward : The coupling of PETAL was previously planned with the LIL Facility Transferring of PETAL and coupling with LMJ Quads was decided in 2010 Opportunity to study a wider field of physics and prepare efficiently HiPER 2

3 Implantation in LMJ building PETAL beamline Energy Bank Compression stages (SS2) South CEA 2010 PETAL 1 st LMJ Quadruplets Source North Focusing 3

4 PETAL characteristics versus LMJ PETAL goals Energy : up to 3 kj * Wavelength : 1053 nm (526 nm option) Pulse duration : from 0,5 to 10 ps Intensity on target : ~ W/cm² Power contrast : 10-7 at -7 ps Energy contrast : 10-3 LMJ (1 beam) Energy : up to 7.5 kj (x 176 = 1,3 MJ) Wavelength : 351 nm Pulse duration : from 0,3 to 25 ns Intensity on target : ~ W/cm² * limited at the beginning to 1 kj due to the damage threshold of the transport mirrors 4

5 PETAL Project Phase I- Key issues : Front End, Compression stage II Laser development : Front end & Amplifier section III- Compression : Air transport & Compression stages IV- Focusing : Vacuum Transport & Focusing V- Coupling to LMJ LIL LMJ 5

6 Amplification kj UHI PETAL = kj-uhi «Robust» 3 kj, sub-ps : CPA 3 kj, robust : Nd:glass amplification Amplifier section = LMJ type I t I t I t I t Short pulse oscillator (100 fs) Stretching (qq ns) Amplification in the laser chain(qq kj) Compression (ps) Physical limitations Non-linear effects : filamentation High stretching factor, vacuum, reflective optics Amplification : spectral narrowing Pre-amplification with large Dl : OPCPA, Power amplification : glass mixing Geometric and chromatic aberrations Large size optics, thermal effect in amplifiers : deformable mirror Chromatism corrector Compressor adjustment Damage threshold Large size optics, in vacuum, fs regime Filamentation Damage Threshold 6

7 Intensity (a.u) Front-End Architecture : OPCPA Technique 1 Input Output Source 0,5 OPCPA amplifier Femtosecond oscillator Laser Pump 14W CW (532nm) Femtosecond Laser MHz nm 3nJ - 100fs - 16nm Pulse selector Pockels cells Öffner stretcher X Collimator wavelength (nm) Optical fiber (PM) collimator LBO 25mm Signal 100 mj nm 4.5 ns - 8 nm Single shot BBO 15mm Driver Alimentation + Driver Fiber oscillator Regenerative amplifier Rod amplifier Fiber Oscillator monochromatic Modulator A.O Temporal pulse shaping Collimator Diode pumped amplifier Pockels Cells Spatial beam shaping Flash pumped amplifier KTP Pump 1.2J - 526nm - 4,5ns monochromatic Single shot Pump * E. Hugonnot et al., Appl. Opt. 45 (2006) 7

8 Front end OPCPA : 100 mj / 8 nm / nm Offner system Femtosecond Oscillator Pump Laser 14W continuous 532nm Femtosecond Laser MHz 1053 nm 3nJ - 100fs - 16nm Pulse Selector Pockels Cell Öffner Stretcher Collimator Optical Fiber (PM) collimator Signal Output mJ/1053nm/4,5ns/8nm single shot LBO 25mm BBO 15mm Front End output beam (LIL) Driver Power supply + Driver Fibered oscillator monochromatic fibered Source Acousto-optic Modulator Temporal shaping Modulator Collimator Regenerative Amplifier Diode pumped head Pockels Cell Active Beam Shaper Power amplifier Flash Pumped head KTP Pump 1.2J/526nm/4,5ns/monochromatic Single shot Pre-amplifier on table Integrated Pre-amplifier Module (PAM) * E. Hugonnot et al., Appl. Opt. 45 (2006) 8

9 Amplifier section : Architecture LIL/LMJ CEA 2011 LMJ PETAL : 4 x 2 beams 1 x 1 beam Automatic alignment LMJ architecture : 4 passes Amplifier slabs : Nd:phosphate glasses Beam size : 35 x 37 cm² 1,7 ns # 3 nm # 6,4 kj M1 deformable mirror Chromatism Corrector* Diffractive Fresnel Lens CEA 2007 Amplifiers PEPC * C. Rouyer, Opt. Express 15, (2007) 9

10 The Amplifier Section LMJ Laser bay n 2 Amplifier slab during the integration process LMJ PETAL Energy bank 10

11 Transport, Compression, Focusing Beam from Amplifier Section Focusing Vacuum Transport Compression stages 2 stages compression : 1st stage in air Input : 6.4 kj # 1.7 ns Output : 4.4 kj # 350 ps 2nd stage in vacuum Output : 3.6 kj # ps Air Transport CEA

12 Compression Sub-aperture compression scheme* 4 J/cm² and 40 x 40 cm² beam 400 x 1800 mm² gratings 4 sub-aperture compressors with beam phasing 500 fs 3,6 kj Specific diagnostics 350 ps 4,4 kj 1,7 ns 6,4 kj Cylindrical mirror Segmented mirror Grating developments * N Blanchot, Opt. Express (2010) 12

13 Compression wavefront correction Feedback of Phase 1 : Wavefront deformation due to grating modification under vacuum : 4 compressors = Corrugated surface Pre-correction in air by segmented and cylindrical mirrors R Y R Y R Y R Y R X R X R X R X Tilt of segments of segmented mirror R X R Y R Y R Y R Y 2 cylindrical mirrors or 1 toroidal mirror Rx = Ry = Tr2 Tr1 Front d énergie Front d onde Tr = Tr1 + Tr2 No impact on compressor performances Tr = 0 13

14 Segmented and toroidal Mirrors Mirror segment : 1 translation 2 rotations Capacitive sensor Mirrors support : 1 translation 2 rotations PZT connected to capacitive sensor Segment Segment adjustment axis Course sensibility δz +/- 10 µm 1 nm θx +/- 40 µrad 0.05 µrad θy +/- 40 µrad 0.05 µrad toroidal mirror 14

15 Compression stages Compression box CEA 2012 Room for the 1st compression stage CEA 2012 Room for the compression diagnostics CEA 2013 CEA

16 Transport and focusing of the compressed beam Box for the parabola Reservation for the 2w option Focusing by off-axis parabola 7,8 m focal length, 90 deviation Multi-beam option Exploration for target : +/- 50 mm Focal spot ~ 50 µm Pointing mirror Vacuum transport Off-axis parabola Alignment mirror 16

17 PETAL diagnostics DTF TEI TDC RECO SORF CEA 2010 Integrated Equipment Equipment being integrated Equipment being designed TDA REA TDI Légende : TDI : Table de Diagnostics d Injection TDA : Table de Diagnostics d Amplification TDC : Table de Diagnostics sortie Compresseur DTF : Diagnostic de Tache Focale TEI : Tiroir Etalon d Injection REA : Radiomètre Etalon d Amplification RECO : Radiomètre Etalon de Compression SORF : Système Optique de Réduction de Faisceau 17

18 Diagnostics SORF and TDA Leaky mirror, beam reduction, diagnostics SORF Salle E110 Bâti MDA MDA VOSA SORF Banc de réglage SORF sur la LIL MT1 CCD Energy distribution O.F. Temporal SORF CCD Wave front O.F Spectrum O.F Energy MDA VOSA Salle E110 18

19 Compressor Diagnostics TDC Salle TDC (ISO8) Salle ISO8 à SS2 Compression : Far field Near field Spectral width Spectral phase 10 measurements for compressors alignment and compressed beam characterization : Synchronization & Phase adjustment : Characterization : spectral Interferometry Short time contrast PETAL/LMJ synchronization Long time contrast Wavefront Energy 19

20 The damage threshold problem Sub-ps and ns damages Silice 351nm, 3ns, 30 J/cm² Silice 1053nm, 400 fs, 3 J/cm² ns sub-ps Norton SPIE 6403 (2007) Absorption on precursor default (scratch, SSD, inclusion, structural default) Plasma, pressure, shock wave, damage Complex, multi-physic problem Multi-photonic absorption, tunnel effect ionization, relaxation, N e > N Cr (10 20 à e - /cm 3 ) Dielectric breakdown = damage 20

21 Y Axis Great efforts have been made on gratings* Tests sur échantillons SiO 2 HfO 2 SiO 2 HfO X Axis Modélisation des structures - The effect of E field has been demonstrated ( publications) -PETAL gratings have been optimized : threshold > 4J/cm² - Work in progress with new structures (2 patents) Fabrication industrielle pleine taille Métrologie LMO, physique de l endommagement fs * J. Néauport, Opt. Express 15 (2007) 21

22 Probabilité But mirrors cannot sustain more than J/cm² (4 J/cm² specified) : new technologies are needed 1 0,9 0,8 0,7 0,6 0,5 0,4 0,3 0,2 0,1 Probabilité d'endommagement Echantillon DKTOB54 - polaristion S et P - 45 fluence calculée avec 90% de l'énergie 0 1,5 1,7 1,9 2,1 2,3 2,5 2,7 2,9 3,1 3,3 3,5 Fluence moyenne (J/cm²) Pola P Pola S Maximum energy available : Test on Mirror : fs Correspond to E beam = 3.4 kj Beam modulation => E max ~ 1 kj Perhaps more : spectral smoothing Monochromatic Study of damages morphology : Broad spectrum (16 nm) Several damage processes can be observed depending on material properties and/or irradiation conditions : Thermal effects Mechanical effects Ripples, surface plasmons Plasma burn 22

23 Ways of improvment Materials : Test of high index materials (other than HfO 2 ) Test of mixtures Use of mixtures (IBS) Coating processes : e-beam + IAD IBS Impact of process on wave front Effect of coating process parameters (IAD) Design of layers : Multi-materials coating (nb>2) Adjustment of layers thickness Combination multi-materials + layers thickness PAGE 23 23

24 Dammage threshold of materials and mixtures Case of simple materials for laser coatings 500 fs, 1on1, 1030 nm Case of mixtures Low index High index 24

25 Physics with PETAL 1 : Standard HED Physics Generation of intense electron, ion and X-ray beams Electrons up to 150 MeV (Temperature 7-10 MeV) Protons up to 120 MeV (Temperature 6-14 MeV) Study of their propagation in Warm Dense Matter Stopping power Extreme WDM states by short-pulse Isochoric heating Laboratory Astrophysics Experiments Opacity, hydrodynamics similarity, Fast ignition experiments 25

26 Physics with PETAL 2 : Extreme Physics Acceleration and High Energy Physics Electron acceleration to 100 GeV- 1 TeV Channel-guided acceleration by laser wakefield in low density plasma -> K. Nakajima talk A. Puckov Extreme power laser Cascaded Compression Conversion (C3) scheme, up to EW : Coupling of CPA, OPCPA & Backward Raman (or Brillouin) Amplification CPA OPCPA BRA -> T. Kuehl talk 26

27 Schedule for LMJ first experiments SCF M1 Polarisers Ali.1w PEPC Amplifier PAM First Experiments J J 2011 A S O N D 2012 J F M A M J J A S O N D 2013 J F M A M J J A S O N D 2014 J F M A M J J A S O N D Align t 1B AS Assembly Align t 4B AS Ali. CC Shots 1w Assembly Ali. 4B TCF Shots 3w Command-Control Tests 27

28 Schedule for PETAL on LMJ LMJ Align Commissioning PETAL First LMJ experiments Last alignment Commissioning First experiments (Restricted access) LMJ increasing capabilities (beams number, energy, shots number, plasma diagnostics, targets, ) Full access (call for proposals beginning in 2015) PETAL Equatorial plan 1st LMJ QUAD 80 to 90 CEA 2011 Experiments with PETAL will begin in 2016 LMJ/PETAL, as LIL, will be open to the scientific community 28

29 Thank you for your attention Commissariat à l énergie atomique et aux énergies alternatives Centre DAM Île de France Bruyères-le-Châtel Arpajon Cedex T (0) F (0) Direction des applications militaires Direction des armes nucléaires Etablissement public à caractère industriel et commercial RCS Paris B

30 PETAL Plasma Diagnostics PETAL+ project : Funded by ANR and managed by the University of Bordeaux Two diagnostics + inserters Availability : 2016 Charged particles diagnostic : Proton spectroscopy & Imaging (proton-radiography) 100 kev-200 MeV Electron spectroscopy 100 kev 150 MeV Hard X-ray spectrometer kev (2 transmission crystals). Shielding : high energy X-ray and particles (magnets) 30