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High contrast Moiré fringes have been observed when two gratings were inserted into a proton beam produced from the interaction of a 100 TW laser beam with a thin solid foil. Moiré fringes with modulation close to 20% were observed in protons with energies between 4 and 7 MeV. The fringes were rotated with respect to a collimated optical test beam, a finding consistent with the protons originating from a point source close to the original target surface. These important results indicate that proton Moiré can be used as a high precision diagnostic of proton beam deflections from electric and magnetic fields in plasmas. © 2003 American Institute of Physics.
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