SBIR Phase II: Advanced Positron Beam Source

这个小型企业创新研究第二阶段项目将开发和展示先进正电子束源(APBS)的实验室原型，该原型将提供适用于材料科学的一系列分析仪器的高质量脉冲正电子束。该项目扩展了从Penning陷阱的放射源积累正电子的技术的最新发展，完全实现了第一阶段项目的技术目标。第二阶段的技术目标是：(1)开发紧凑、低成本的两级正电子陷阱；(2)开发先进的低温正电子慢化器系统；(3)开发高性能正电子聚束器；(4)改进第一阶段从陷阱磁场中提取正电子的方法；以及(5)组装和演示APBS系统。如果成功，该项目将为第三阶段APBS的商业化奠定基础。基于正电子的表面分析技术的商业开发的一个主要障碍是缺乏合适的慢正电子束源。APBS将通过提供紧凑、低成本、用户友好的正电子束源来满足这一需求，该正电子束源最终可以在工业环境中作为交钥匙系统发挥作用。APBS将具有任何其他系统所不具备的高级性能特征。

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.