SBIR Phase II: Advanced Positron Beam Source

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This Small Business Innovation Research Phase II project will develop and demonstratea laboratory prototype of the Advanced Positron Beam Source (APBS) that willprovide a high quality pulsed positron beam suitable for a range of analyticalinstruments for materials science. The project extends the latest developmentsin techniques to accumulate positrons from a radioactive source in Penning traps.The technical objectives of the Phase I project were fully achieved. The technicalobjectives of Phase II are: (1) to develop a compact, low-cost, two-stage positrontrap; (2) to develop an advanced cryogenic positron moderator system; (3) todevelop a high- performance positron buncher; (4) to refine the Phase I approachfor extracting positrons from the magnetic field of the trap; and (5) to assembleand demonstrate the APBS system. If successful, this project will provide thebasis for commercialization of the APBS in Phase III. A major obstacle to the commercial exploitation of positron-based surface analytical techniqueshas been the lack of a suitable slow positron beam source. The APBS will fill this needby providing a compact, low-cost, user-friendly positron beam source that canfunction ultimately as a turnkey system in an industrial environment. The APBSwill have advanced performance characteristics that are not available from anyother system.