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Schematic diagram of the experimental setup. The diagnostics (1)–(4) in the forward direction are shown at the right side. The inset at the bottom left shows a side image when the foil target is irradiated by a main pulse only.
Measured electron energy spectra. The inset is the lineouts in the horizontal and vertical directions through the center of an electron beam recorded by an IP. The clip at large angles is due to the size limit of the IP.
The side image (inset) and its intensity distribution along the horizontal direction. The foil is initially at the distance 0. The laser is incident from the left to the right.
Measured spectra of the transmitted light. For visibility, the intensity in the range 720– is divided by 5000.
(a) Electron beam IP image (inset) and the lineouts in the horizontal and vertical directions through the center of the beam. (b) Measured electron energy spectra. The horizontal bar is the energy resolution of the magnetic spectrometer. The inset is the IP image of the energy spectra. The short dashed line is the electron energy spectra with a main-pulse energy as described in the text; for visibility, the axis value is multiplied by 2.
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