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

<div>The relative intensity profiles at constant power and beam waist as a function of the radius of an LP laser: the fundamental Gaussian beam <svg height="12.0444pt" id="M87" style="vertical-align:-3.29106pt" version="1.1" viewbox="-0.0498162 -8.75334 25.7401 12.0444" width="25.7401pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M495 163C480 117 462 85 444 65C421 39 387 34 332 34C290 34 256 36 236 47C218 57 213 77 213 131V526C213 612 222 616 301 622V650H40V622C122 616 128 611 128 526V126C128 41 120 34 36 28V0H489C498 31 519 126 525 157L495 163Z"></path></g><g transform="matrix(.013,0,0,-0.013,6.89,0)"><path d="M692 302H438V274C537 267 543 260 543 188V103C543 61 531 48 511 37C489 26 458 20 424 20C231 20 146 188 146 333C146 517 258 630 411 630C507 630 582 597 606 474L634 480C627 546 622 601 619 636C586 643 510 665 426 665C230 665 44 552 44 321C44 122 191 -15 411 -15C491 -15 573 7 635 21C629 49 628 81 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Laser and Particle Beams

fig1

Figure 1

Figure 1: Direct Laser-Driven Electron Acceleration and Energy Gain in Helical Beams 