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Proton beam energy spectrum from CR-39 detectors (a) 50 nm Si3N4 stand alone target and (b) with a 30 nm Si3N4 shutter placed in front of a 50 nm Si3N4 target. By inserting the shutter, the highest energy protons shift away from the target normal toward the laser axis (20°) which is characteristic of a high contrast laser solid interaction.
