Structure Loaded Vacuum Laser-Driven Particle Acceleration Experiments at SLAC Page: 3 of 14
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AAC 2006 proceeding article
Verification of the Lawson-Woodward Theorem
To verify the Lawson-Woodward Theorem two successive laser time scans, one
with the boundary in place and the following with the tape moved out were taken.
Figure 1 shows two successive laser time scans; Figure la corresponds to data taken
with the boundary in place and Figure lb with the boundary removed. As observed in
Figure la there is a clear laser-driven energy modulation that peaks at a laser timing of
295 psec. In Figure lb it can be observed that the laser induced energy modulation
disappears when the boundary is removed
a) b)
31 31
30 + laser on 30 - laser on
o laser off ++
29 -+ + + - 29 O laser off -
28 - - 28 - -
27 -+ r++ + 27
Q 26 ++ + Q6
N 26 --
D 23 j7~~ - 4 ++ +
21 21 +t Q0 T ~ ~ L'-- + - +
280 285 290 295 300 305 310 315 320 280 285 290 295 300 305 310 315
laser timing (psec) laser timing (psec)
FIGURE 1. The effect of the field-terminating boundary
Dependence on the laser polarization and the laser electric field
amplitude
Figure 2a shows the observed average energy modulation as a function laser
polarization, which is found to be in good agreement with the expected cosine
dependence. Figure 2b shows the observed dependence of on the peak electric field of
the laser. The average energy modulation varies linearly with the incident laser electric
field as expected from theory and shows no significant offset from the origin.
These measurements constitute the experimental observation of laser-driven
acceleration of relativistic electrons in vacuum by a properly terminated, linearly
polarized visible laser beam. The energy modulation was confirmed to scale linearly
with the longitudinal component of the electric field of the laser, to follow a cosine
dependence on the polarization, and to require a boundary to limit spatial the
interaction of the incident laser beam with the electron beam.3
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Plettner, T.; Byer, R. L.; Colby, E. R.; Cowan, B. M.; Ischebeck, R.; McGuinness, C. et al. Structure Loaded Vacuum Laser-Driven Particle Acceleration Experiments at SLAC, article, April 9, 2007; [Menlo Park, California]. (https://digital.library.unt.edu/ark:/67531/metadc889709/m1/3/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.