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(Color online) Schematic of the experimental setup. Two laser pulses with a time delay between them are focused on an Al target (thickness: 12 μm) to produce electron pulses. The distance between the focal points of the two laser pulses and the time delay between them are variable. The laser-produced electrons are emitted isotropically. Some part of the electrons emitted along the target-normal direction can be focused on a fluorescent screen by an electron lens. The electron pulses are deflected by each of the laser plasmas immediately after they are emitted from target; consequently, the source image position on the fluorescent screen is different from that when another laser plasma does not exist.
(Color online) (a) Electron source images for time delays of −2.1, −0.46, 0, 0.46, and 2.1 ps and (b) one-dimensional intensity distributions crossing through each intensity peaks of (a).
(Color online) Electron pulse deflections as a function of time delay for laser spot distance of 30 μm (circle), 50 μm (square), 110 μm (diamond), and 240 μm (cross). The deflection is determined by the difference of the distance between the two electron source images from that between the laser spots. Each point is obtained by averaging the distances obtained from 30-50 laser shots. The solid lines are fitted to exponential functions to estimate the interaction times of the two electron pulses.
(Color online) Schematic for the trajectories of the electrons measured with the imaging system. Solid lines show trajectories of the electron pulses deflected by electromagnetic field. The electron pulses are observed as if they were generated from the position indicated by the dashed lines.
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