slide1
Download
Skip this Video
Download Presentation
Towards Table-Top FELs

Loading in 2 Seconds...

play fullscreen
1 / 9

Towards Table-Top FELs - PowerPoint PPT Presentation


  • 120 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Towards Table-Top FELs' - bebe


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

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

slide2

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

slide3

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

slide4

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

slide5

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

slide6

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

slide7

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

slide8

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

slide9

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

ad