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Due to the capability of making a compact accelerator and the ability to generate an ultra-short bunch electron beam, a laser wakefield acceleration(LWFA) is widely studied. In LWFA, a dephasing effect is the main limitation of the electron energy. To overcome the dephasing effect and increase the electron energy, we studied the linearly tapered density. A 2D particle in cell simulation and the experimental results show that with linearly tapered density, we could increase the electron energy with the same laser power. The details of the work will be presented.
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