Abstract
The acceleration of electrons in laser-plasma channels is one of the contemporary ideas on the energy frontier of accelerators. Demands of low energy spectrum and emittance are especially important for discussed colliders and light sources based on acceleration in plasma channels. The idea to use a laser-plasma accelerator as injector for these installations instead of traditional RF linacs looks like as a very perceptive way to replace the conventional RF linac-injector or linac-driver by a very compact system. Therefore, the new results of beam dynamics simulations in laser-plasma channel having pre-bunching stage are discussed in paper. Main simulations were focused on the study of the longitudinal electron motion stability inside of the plasma channel. It was shown that the form and the value of the plasma potential well are essentially depend on laser pulse amplitude, form and duration. The electron beam dynamics, in turn, is specified by plasma potential well parameters, which define the electrons capturing into acceleration and output parameters of the bunch. Electrons loosed from the synchronous motions in the plasma wave are defocusing soon after falling out from the potential well and are pushed to the plasma channel wall.
Highlights
A number of ideas to increase the rate of the energy gain have been discussed in the last few decades
The problem of electron acceleration in plasma channel with varying density produced by power laser pulse or short electron bunch is under attentive consideration [Feinberg, 1959; Hogan et al, 2005]
The electron beam dynamics is different in the two regimes
Summary
A number of ideas to increase the rate of the energy gain have been discussed in the last few decades. The first one uses a high energy (tens of GeV) beam of particles (both electrons and protons) to form a plasma wave and to accelerate a fraction of the injected particles or a probe beam [Muggli et al, 2008]. Another method is the laser plasma wakefield acceleration (LPWA) [Tajima and Dowson, 1979], in which a laser pulse is used to create a plasma wave. The method of controlled electron selfinjection in wave breaking regime has been proposed [Mangles et al, 2004], energy spread of 3 % has been demonstrated experimentally for this method All these methods improve the energy spread to about 3 % for a beam with energy 1 GeV. The rate of the energy gain can still be very high, while the laser power requirements are comparatively moderate, meaning that compact, laboratory scale facilities could be designed for accelerating electron beams to hundreds of MeV
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