High-efficiency acceleration by the combination of laser and electrostatic field

What is it about?

It is about how to let electron's kinetic energy to have a practical growth. Usually, because the applied electric field is AC, this means electron can be accelerated, and also can be decelerated, i.e, electron's motion is time-periodic. Therefore, a practical growth in kinetic energy is unavailable for pure AC field (because the energy increment cannot be "stored"). Here, we develop a simple method of generating time-rising (over long time scale) motion. Especially, It does not demand the applied field to be of high-strength.

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Why is it important?

Many schemes of laser-related acceleration emphasize high strength of laser. As above pointed out, this merely leads to more drastic time-periodic motion (or oscillation). Acceleration with practical meaning should refer to a growth, rather than an oscillation, in kinetic energy. It points out that pursuing time-rising (over long time scale) motion should be our target. Moreover, this will make acceleration to be cheaper.