Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 10: Poster: Interaction with strong or short laser pulses

A 10.2: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Feasibility of electron cyclotron auto-resonance acceleration by a short terahertz pulseYousef Salamin1, •Jian-Xing Li2, Benjamin Galow3, and Christoph Keitel21Department of Physics, American University of Sharjah, United Arab Emirates — 2Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69029 Heidelberg, Germany — 3Gaisbergstraße 61, 69115 Heidelberg, Germany

We investigate conditions for an electron vacuum auto-resonance accelerator scheme that would employ circularly polarized terahertz (THz) radiation and currently available laboratory magnetic fields. The system is an electron (or electron bunch) injected in the common directions of radiation pulse propagation and a uniform magnetic field Bs. Parameter values, which could make the scheme experimentally feasible, are identified and discussed. We consider a 1000 ensemble of electrons, initially, distributed randomly within a cylinder of radius 0.232 µm and height 4.642 µm, and centered at the origin of coordinates. The ensemble is injected with kinetic energy that follows a normal distribution of mean K0=1.022 MeV and spread Δ K0=0.1 %. We used the parameter set: pulse power P = 100 TW, frequency f = 4 THz (λ = 75  µm, period T0 = 250 fs = FWHM), a waist radius at focus w0=17 λ≃1.27 mm, and Bs=39.6 T. Our simulations yield a mean exit kinetic energy Kexit= 396.253±0.003 MeV, without electron-electron Coulomb interactions, and Kexit= 396.256±0.168 MeV, with Coulomb interactions properly taken into account. The single-particle calculations yield Kexit= 396.260 MeV. Acceleration from rest is possible, but Bs≃ 300 T, in this case.

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