Direct Laser-Driven Electron Acceleration and Energy Gain in Helical Beams

Figure 2

The average energy gain of an electron initially located at and as a function of the beam waist. The red, blue, and black lines correspond to the weighted average energy of  PW laser powers, respectively. The full and dotted lines correspond to CP and LP lasers. (a–c) The Gaussian beam, , and the helical beams and . (d–f) The helical beams , , and .

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(b)

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(f)