Provision of Open-Access Positron Beam Spectroscopy to Canadian Universities (OPEN-POS)

这项提案要求拨款购买一种放射源，为慢速正电子设施提供高正电子速率，用于获取有关先进材料的独特信息。作为直接结果，我们将为麦克马斯特大学的慢正电子束流提供开放访问：所谓的open - pos。多年来，慢正电子湮灭光谱（PAS）为与界面、点缺陷和空隙的纳米结构有关的材料和器件提供了独特的、无损的表征。PAS需要向所研究的材料或系统输送高通量的正电子，麦克马斯特大学拥有世界上仅有的八个致力于材料科学的慢正电子束之一。我们将把正电子设施的直接使用扩展到任何加拿大学者（远程用户），而不考虑他们的位置，从而增加用户的多样性（跨性别、种族、职业点和地理位置）。在这种情况下，我们将“远程用户”定义为完全控制PAS基础设施和在其上执行的实验，但不存在于基础设施的直接位置的个人或组。我们描述了一系列项目，从熟悉PAS的用户到PAS的新手，包括那些远离慢正电子束位置的人。项目包括光子薄膜、半导体材料、二维薄膜和光伏器件的表征。这项工作的直接效益将是集成光电路（用于为信息高速公路供电）的性能改进和生产成本降低；纳米电子电路和传感器（用于物联网）；还有太阳能电池（对应对气候变化至关重要）。本次提案的具体请求是购买高通量22Na正电子源的资金。通量越高，可以服务的实验和用户数量就越多。因此，我们要求使用现有的最高通量源。在该提案的探索性推广中，我们将为四个远程用户建立访问权限，其中两个是麦克马斯特大学的早期职业研究人员，没有PAS经验；一个有PAS经验，在安大略省的另一所大学工作；一个人没有PAS经验，而且在另一个省。在初步成功推出后，我们预计将需要一年的时间，我们的计划是向加拿大所有感兴趣的用户提供开放访问的open - pos。我们将扩展这些想法，以加速我们的OPEN-LAB模型的发展，该模型将为位于麦克马斯特中心设施的更多基础设施提供访问。

This proposal requests funds to purchase a radioactive source to supply a high rate of positrons for a slow positron facility, used for acquisition of unique information on advanced materials. As a direct result we will provide open access to the slow positron beam housed at McMaster University: so-called OPEN-POS. Slow positron annihilation spectroscopy (PAS) has for many years provided unique and non-destructive characterization of materials and devices related to the nano-structure of interfaces, point defects and voids. PAS requires the delivery of a high flux of positrons to the material or system under study, and McMaster University houses one of only eight slow positron beams in the world devoted to Materials Science. We will expand the direct use of the positron facility to any Canadian academic (remote user) irrespective of their location, providing an increase in diversity of users (across gender, ethnicity, career-point, and geographical location). In this case we define “remote user” as an individual or group who have complete control of the PAS infrastructure and experiments performed thereon, but are not present at the infrastructure's immediate location. We describe an array of projects from users familiar with PAS, to those new to PAS and including those who are remote to the location of the slow positron beam. The projects include characterization of photonic films, semiconductor materials, 2-D films and photovoltaic devices. Immediate benefits of this work will be improvements in the performance and lowering of the cost of production of integrated optical circuits (used for powering the information superhighway); nanoelectronic circuits and sensors (used in the internet of things); and solar cells (critical in the fight against climate change). The specific request of this proposal is funds for the purchase of a high-flux 22Na positron source. The higher the flux, the greater the number of experiments and users that can be serviced. We have thus requested the highest flux source available. In the exploratory roll-out to be enabled by this proposal we will establish access for four remote users two are early-career researchers at McMaster with no PAS experience; one is experienced with PAS and located at another university in Ontario; one is not experienced with PAS and is located in a different province. Following successful preliminary roll-out, which we anticipate will take one year, our plan is to provide open access to OPEN-POS across Canada to all interested users. We will expand these ideas to accelerate the development of our OPEN-LAB model which will provide access to more infrastructure located at McMaster's central facilities.