Electron acceleration by coherent laser pulse echelons in periodic plasma structures

Transcription

1 Electron acceleration by coherent laser pulse echelons in periodic plasma structures A. Pukhov I. Kostyukov, T. Tückmantel, Ph. Luu-Thanh Uni Dusseldorf, Germany Uni Nizhni Novgorod, Russia A. Pukhov et al., arxiv.org/

2 Conventional accelerators XFEL at DESY LHC The accelerating field is limited to some MeV/m

3 PeV acceleration quest Accelerators reach astrophysics scale A conventional PeV accelerator would circumvent the Earth

4 Petawatt Lasers The laser electric field at I=10 21 W/cm 2 is E=100 TV/m = V/m We have the Jinn in the bottle!

5 Laser Wake Field Acceleration The idea was proposed by T. Tajima and J. W. Dawson, Phys.Rev.Lett. 43, p.267, (1979) Short Pulse d n w «w p 0 n 0 X E ne cm dn e ne 1 GV/m E l p e - X

6 Laser bubble acceleration Pukhov & Meyer-ter-Vehn Appl. Phys. B 74, pp (2002) Texas result 2013: 2 GeV in 2 cm plasma: ~ 100 GeV/m rate

7 1 GeV/m sustained rate

8 Non-plasma accelerating schemes - Dielectric photonic crystals with axial laser coupling - Dielectric phase masks with side laser coupling Dielectrics combined with short pulse lasers can provide sustained accelerating fields at GV/m level Well competitive with weakly nonlinear wake fields.

9 Dielectric photonic mask with side laser coupling, claimed up to 10 GV/m field T. PLETTNER, P. LU, AND R. L. BYER Phys. Rev. ST Accel. Beams 9, (2006) pulse-front tilt

10 The future is fiber accelerators G. Mourou et al., Nature Photonics 2013 an echelon of mutually coherent laser pulses revolution in laser technology

11 Let us free the Jinn and go full plasma - ican provides echelons of coherent laser pulses - Intensities well above W/cm 2 - Sustained accelerating rates of 100 GV/m and above become possible - Resonant and free streaming plasma structures can be discussed A. Pukhov et al., arxiv.org/

12 Resonant plasma structure A. Pukhov et al., arxiv.org/ laser pulse Laser pulse echelon laser pulse Plasma microresonators

13 A. Pukhov et al., arxiv.org/ Fields in the resonant plasma cavity E E B 1 k 0 x k 0 x k 0 y k 0 y k 0 y 6-1 k 0 x 0 1

14 Energy gain and focusing in resonant plasma cavity A. Pukhov et al., arxiv.org/ Energy gain, GeV 1 2 distance, meters Sustained fields seem be limited below 100 GV/m by structural stability of the resonator

15 Open plasma structures: multi TV/m fields are feasible A. Pukhov et al., arxiv.org/ E, TV/m 3 x /l x /l Two counter-propagating laser echelons and a periodic plasma structure -5

16 A. Pukhov et al., arxiv.org/ Energy gain of 120 GV after 5.3 cm 4 TeV/m sustained acceleration rate 200 Energy, GeV c) 0.5 x /l d) x /l x /l

17 Single laser echelon: Plasma grid on a solid substrate A. Pukhov et al., arxiv.org/ x /l 0 E, TV/m x /l -0.5 Single laser echelon can create the same accelerating field pattern

18 Conclusion electron acceleration A. Pukhov et al., arxiv.org/ ican technology heralds a revolution in laser-plasma based acceleration - Sustained acceleration rates of TV/m and above may become feasible

19 Structured ion acceleration A. Pukhov Uni Dusseldorf Germany

20 Thin foils: light sail regime circularly polarized laser pulse Zhang, et al., (2007), Robinson, et al., (2008); Klimo, et al., (2008); Yan, et al., (2008). Light pressure: I P 3.3 c 19 for I 10 GBar W/cm 2. To be sure the CP ponderomotive force is balanced by the charge separation field and all the ions in the target can be accelerated. To be sure the electrons and ions are not completely separated.

21 3D regime of light sail: Gaussian pulse a=50 t=26 T L s r =5l n/n c =80 L=0.5l,

22 Shaped foil target (SFT) M. Chen, T.P.Yu, A. Pukhov, Z.M.Sheng PRL 2009 In the regime of RPA, the foil motion equation: 2 d E L 2 2 (1 ) 1, p mnlv v, mnl dt 2 c For Gaussian Laser pulse: Foil area mass density E E 2 L L L L s L nml E 0 0 e e 2 2 ( r / s L ) 2 2 ( r / st ) 2s T See references here: M. Chen et al., PRL 103, (2009) T.P. Yu et al., Laser Part. Beams 27, 611 (2009) M. Chen et al., New J. Phys. 12, (2010)

23 Shaped target M. Chen, T.P.Yu, A. Pukhov, Z.M.Sheng Phys. Rev. Lett. (2009) t=20t 0 3D simulation: N e and N i Well-defined proton bunch for the shaped foil target Flat foil

24 Conclusion ion acceleration - Shaped foils are very advantageous for ion acceleration in light sail regime - Laser pulse alignment onto the foil microstructure is crucial - ican technology is best for laser interaction with microstructured targets