| Paper | Title | Page |
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MOPPA006 |
Acceleration of Electron Bunches Injected into a Wake Wave | |
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| The process of trapping and acceleration of nonmonoenergetic electron bunches by a wake wave excited by a laser pulse in a plasma channel is investigated. The formula for length of a bunch in the accelerating stage as functions of its initial energy spread and initial sizes (length and cross-section radius) is derived. It is shown that there are conditions for injection of a nonmonoenergetic bunch into a wake wave at which the energy spread of a high-energy electron bunch reaches its minimum value at a certain acceleration length. The electron energy spread in the accelerated bunch can be minimized due to electron focusing in energy space. An equation that allows one to determine the acceleration length at which energy focusing occurs is derived. This length depends on the conditions of electron injection and the properties of the accelerating wakefield. An important result is that the effect of energy focusing can suppress the energy spreads related to the initial spreads of injected electrons in both coordinate and energy spaces. Due to this effect, it is possible to obtain accelerated electron bunches with energies of several GeV and relative energy spreads on the order of 0.1%. | ||