New High Density Scintillator-Based X-ray Imaging System for Nondestructive Evaluation of Composite Structures

Not Available The objective of this proposal is to demonstrate 1) new principles of sampling and 2) new principles of beam sampling will allow obtaining of up to billion times attenuated replica of the beam. Acousto-optical diffractive gratings in noble gases kept at normal atmospheric pressure and temperature will be used in one scheme to ensure absorptionless sampling of high power beams. Sampling with the aid of wire grids will be tested for mid-IR radiation. Both devices can have very large aperture appropriate for embedding typically large high power beams. The beam diagnostic system will include measurement of the angular divergence of a beam, and pump-probe techniques for profiling of infrared beams with the aid of inexpensive techniques developed for visible radiation. Angular Selective Achromatic Diffraction Gratings will be developed for divergence measurements. The new high power beam diagnostic systems will be based on inexpensive materials and manufacturing procedures. The Phase I effort will be identifying the feasibility of the suggested principles and schemes.