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Laser wakefield acceleration in the plasma can provide compact sources of relativistic electron bunches of high brightness. Since laser pulse propagates in plasma its group velocity is lower than the speed of light, therefore, the time of acceleration is finite. In order to achieve maximal efficiency, it is important to maintain maximal efficiency of energy transition from laser pulse to electron bunch. This can be achieved by two effects. The first one is the enhancement of the laser pulse intensity due to the narrowing of the plasma channel. This effect leads to increase of the group velocity [1]. The second one is the reduction of the bubble length [1-3]. This effect causes a phase shift of maximum of the accelerating field and the witness-bunch, compensating relative shift due to the difference in witness-bunch and group velocities. These two effects can possibly lead to longer time of laser wakefield acceleration. We demonstrate these dependencies analytically: decrease in the bubble length with increasing plasma density and narrowing of the channel, parameters at which the group velocity of the laser pulse increases, an increase in the amplitude of the laser pulse with narrowing of the channel.
1. D.S.Bondar et al. arXiv preprint arXiv:2506.04021. 2025.
2. M.Seniak, N.Mykhailyshyn, D.Bondar et al. Report on this conference.
3. D.S.Bondar et al. arXiv preprint arXiv:2509.03229. 2025.
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