Theory of the Laser Wake-Field Accelerator Revisited Wake Overtaking, Localized Spectrum an.pdfVIP

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Theory of the Laser Wake-Field Accelerator Revisited Wake Overtaking, Localized Spectrum an.pdf

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Theory of the Laser Wake-Field Accelerator Revisited Wake Overtaking, Localized Spectrum an

a r X i v : p h y s i c s / 0 5 0 7 1 0 0 v 1 [ p h y s i c s .p l a s m - p h ] 1 3 J u l 2 0 0 5 Theory of the Laser Wake-Field Accelerator Revisited: Wake Overtaking, Localized Spectrum and Ponderomotive Acceleration T. Esirkepov,? S. V. Bulanov,? M. Yamagiwa, and T. Tajima Kansai Research Establishment, JAERI, Kizu, Kyoto, 619-0215 Japan (Dated: April, 2005) The electron and positron acceleration in the first cycle of a laser-driven wakefield is investi- gated. Separatrices between different types of the particle motion (confined, reflected by the wake- field or ponderomotive potential and transient) are demonstrated. The ponderomotive acceleration is negligible for electrons but is substantial for positrons. An electron bunch, injected as quasi- monoenergetic, acquires a localized energy spectrum with a cut-off at the maximum energy. PACS numbers: 41.75.Jv, 52.38.Kd, 45.20.Jj Laser-driven charged particle acceleration is an attractive alternative to cyclic accelerators and linacs, promising to provide much greater acceleration rate with a much more compact facility. At the dawn of the laser technology the “optical maser” was suggested in Ref. [1] to accelerate electrons. The long-living strong Langmuir wave (wakefield), left in the wake of a short intense laser pulse in a low-density collisionless plasma, accelerates duly injected electrons in the Laser Wake-Field Accelerator (LWFA) concept introduced in Ref. [2]. For efficient acceleration of charged particles, the laser pulse must be relativistically strong, i. e., its amplitude a0 = eE0/meωc 1. To provide electrons one must use an externally preaccelerated electron bunch or exploit the effect of self-injection due to a longitudinal Langmuir wave-break [3] or/and a transverse wave-break [4], which dominates when the laser pulse waist becomes comparable with or less than the wakefield wavelength, e. g., due to the pulse self-focusing. The injection of the preaccelerated electron bunch co-propagating w