Macroporous Si Particle Collimator

Collimators are used in all X-ray and particle detectors as well as in multiple commercial applications that use X-ray imaging to maximize the sensitivity, resolution and contrast of images. State-of-the-art collimators can offer either high off-axis blocking or high on-axis transmission, and are heavy and bulky. MicroXact Inc.is proposing to continue the development of a particle collimator for NASA and commercial applications that will combine superior mechanical stability, light weight, improved Ly-a line suppression, with efficient off-axis blocking and high on-axis transmission efficiency. The proposed collimator is based on macroporous silicon with proprietary conformal pore wall coating. In Phase I of the project the MicroXact finalized the performance specifications, modeled and designed the collimator structure, demonstrated and optimized most critical fabricated steps, and demonstrated a-particle on-axis transmission meeting specifications to fully validate the proposed approach. In Phase II MicroXact will optimize the material fabrication, and design and fabricate a packaged particle collimator that will fully comply to NASA specifications and will perform testing in relevant environment. The collimators and antiscatter grids developed on this SBIR project will be commercialized in Phase III.