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Towards Table-Top FELs

Towards Table-Top FELs. F. Grüner, A. Maier, M. Fuchs, C. Schroeder, et al. basic concept laser-plasma accelerator physics state-of-the-art critical issues first experiment: laser-driven soft x-ray undulator radiation outlook towards a first table-top FEL demonstration

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Towards Table-Top FELs

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  1. Towards Table-Top FELs F. Grüner, A. Maier, M. Fuchs, C. Schroeder, et al. • basic concept • laser-plasma accelerator • physics • state-of-the-art • critical issues • first experiment: laser-driven soft x-ray undulator radiation • outlook • towards a first table-top FEL demonstration • near-future experiment with spontaneous emission FEL 09 Conference, Aug 25, 2009, Liverpool

  2. basic concept capillarypre-ionized gas200 µm diameter undulatorsub-cm period diagnostics/applications magnetic lenses500 T/m gradient laserenergy ~ Jpulse length ~ 25 fs up to 6 m(modular) < 2 m 2 laser tables FEL 09 Conference, Aug 25, 2009, Liverpool

  3. laser-plasma accelerator:basics typical length scale = plasma wavelength laser pulse bubble plasma(capillary) high-intensitylaser ~ 5 fs PIC simulation (M. Geissler) FEL 09 Conference, Aug 25, 2009, Liverpool

  4. laser-plasma accelerator:state-of-the-art J. Osterhoff, et al., PRL101, 085002 (2008) • 2000, theory of bubble acceleration (Meyer-ter-Vehn, MPQ) • 2004, first experimental results (Nature cover issue) • 2006, Berkeley lab reaches 1.0 GeV (W. Leemans et al., Nature Physics) • 2008, stability improvement (e.g., J. Osterhoff et al., PRL) • 2008/09, new schemes: LBNL: 0.5-1 nC from backside of gasjet low longitudinal and transverse momentum C.Geddes et al, PRL 100 (2008) LOA: 1%-rms energy spread (10 pC) C.Rechatin et al, PRL 102 (2009) FEL 09 Conference, Aug 25, 2009, Liverpool

  5. critical issues • space-charge issues (case study: 0.4 nC, σz = 1.0 µm, 150 MeV) frozen bunchestimates self-consistent point-to-point simulations F. Grüner, et al., Phys. Rev. STAB 12, 020701 (2009) • wakefields • → cryogenic undulator (cooperation with BESSY) → superconducting undulator (coop. w/ FZK) FEL 09 Conference, Aug 25, 2009, Liverpool

  6. laser-driven soft x-ray undulatorradiation M. Fuchs et al., submitted to Nature phys. first experiment at MPQ 200 MeV, 5 pCundulator: 30 cm, 5 mm period • spectrum in 70% of all laser shots • hints for normalized emittance of ~ 0.8 mm.mrad FEL 09 Conference, Aug 25, 2009, Liverpool

  7. outlook I:first demonstration experiment • today‘s experimental parameters don‘t allow FEL process • solution 1: improve beam quality (long way) • solution 2: design „minimal demonstration“: GENESIS simulationsincluding:space-chargewakefieldsbeam transport paper in preparation FEL 09 Conference, Aug 25, 2009, Liverpool

  8. outlook II:ultra-short spontaneous emission typical length scale = plasma wavelength laser pulse bubble ~ 10 fs PIC simulation (M. Geissler) on axis peak intensity: 10,000 photons/(shot mrad2 0.1% bw) in 10 fs [femtoslicing: flux of 1,000 photons in 100 fs, 0.1% bw ] near-future goal: x-ray pump-probe experiments5 keV, 10 fs (with 2 GeV electrons) FEL 09 Conference, Aug 25, 2009, Liverpool

  9. conclusion • basic concept • laser-plasma accelerators: state-of-the-art • critical issues (space-charge, wakefields) • minimal demonstration experiment • first laser-driven x-ray undulator source FEL 09 Conference, Aug 25, 2009, Liverpool

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