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Perspectives of Plasma- Wakefield Acceleration basics p erspectives state - of - the -art brief overview of various pro

Perspectives of Plasma- Wakefield Acceleration basics p erspectives state - of - the -art brief overview of various projects. F. Grüner , Universität Hamburg & Center for Free- Electron Laser Science. basic principle of any accelerator. one needs an electric field….

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Perspectives of Plasma- Wakefield Acceleration basics p erspectives state - of - the -art brief overview of various pro

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  1. Perspectivesof Plasma-WakefieldAcceleration • basics • perspectives • state-of-the-art • briefoverviewofvariousprojects F. Grüner, Universität Hamburg & Center for Free-Electron Laser Science

  2. basic principle of any accelerator one needs an electric field… …charged particles are then accelerated charge separation - + - electron

  3. accelerators can be quite large… First X-ray FEL (2009):Stanford, USA kilometerlong!!!!....

  4. but also quite small… lab setup of a Laser-Plasma-Accelerator at MPQ (S. Karsch et al.) pulse of a high- Power laser plasmacell:cm short!!!!....

  5. plasma wakefield acceleration typicallengthscale = plasmawavelength plasma laserpulse withrelativisticintensity wake plasma(capillary) ~ 5 fs high-intensitylaser:~ 5 J / 25 fs PIC simulation (M. Geissler) Ez ~ TV/m

  6. perspectives • EuroNNAcworkshop @ CERN, May 2011, top 5 goals, amongthem • - „table-top“ XFEL • - 10 GeVstage • - stableoperation 24/7 • brilliant X-raysources„athome“, addedvalues: • - intrinsicsynchronization (driverlaser, X-ray pulse, fewfs) • - compactenoughforhospitals: medicalapplications • - higherpeakcurrents (above 20 pC/4 fs) • high-energyphysics • - TeVmachine • - sureenough, manyopen questions (emittancegrowth, staging,timing/pointing for ~100 stages, efficiency,…..) ~ 16 m Leemans & Esarey, Physics Today, March 2009

  7. state of the art • before 2000: theoryon LWFA, experimentswith „thermal“ energyspectra • 2000 theoryofbubbleacceleration (Meyer-ter-Vehn & Pukhov, MPQ): needsstrongerlaser • 2004 first experimental results, peakedenergyspectra (LBNL, LOA, RAL, Nature) • 2006 Berkeley lab reaches1.0 GeV(W. Leemans et al., Nature Physics) • 2008 stabilityimprovement (e.g., J. Osterhoff et al., PRL) • 2009 firstlaser-driven soft X-rayundulatorsource(F. Grüner et al., Nature Physics) • 2010-… diagnostics: bunchlength, emittance, positionbehindlasernewinjectionschemes: down-ramp, counter-propagatinglasers, ionization, shock-front courtesyof S. Karsch

  8. howdoesit all work? • keyquestions • - emittancegrowth • - energyspread • - injection • - beam loading • - exitintovacuum • - stagingscalable? • selft-consistentanalyticaltreatmentstoocomplex → PIC codes • but: PIC codessufferfrom - idealisticmodelling • - numericalheating • - resolutionissues (spacecharge) open questions

  9. Prominent LWFA results Imperial College Rutherford Lab Strathclyde Oxford PWA worldwide Lund Düsseldorf JenaDresden MunichHamburg Berkeley Lincoln Ann Arbor Austin Livermore LOA JAEA, Nara Frascati APRI Bejing Shanghai …

  10. research clusters in Germany DESY, UHH/CFEL MBI Düssel-dorf HZDR Jena LMU, MPQ

  11. Düsseldorf(Oswald Willi et al.) Düssel-dorf

  12. Jena(MalteKaluza et al.) Jena M. Kaluza et al., PRL 2010 A. Buck et al., Nature Phys. (2011)

  13. Max-Born Insitute (Berlin)(Matthias Schnürer et al.) MBI

  14. HZDR (Dresden)(Ulrich Schramm et al.) HZDR

  15. LMU/MPQ (Munich)(S. Karsch, L. Veisz, F. Grüner, et al.) LMU,MPQ M. Fuchs,…, J. Osterhoff, …,S. Karsch, F. Grüner, Nature Phys. 5, 826 (2009)

  16. LAOLA = DESY+UHH+CFEL(laola.desy.de) DESY, UHH, CFEL

  17. summary • PWA emergingfield: ultra-high gradients + ultra-shortbunches • perspectives: compact light sources, high-energycolliders….. • still many open question: beam quality… • increasing national and international activities • mergingwithconventional, modern accelerators

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