Speaker
Description
This paper presents improvements and design alterations made to the Evaporator System located in Stony Brook University S103, as well as an analysis of the techniques used for general operation and the specific application of creating a mirror for pfRICH. The evaporation process can be used to deposit a thin film of material upon a substrate, requiring a comprehensive vacuum system, and a combination of materials to sublimate or evaporate for the reflective coating. To adequately create the mirror, a procedure in which aluminum pellets are evaporated and chromium is sublimated resulting in a reflective finish is undergone, multiple modifications would then be made to the interior of the existing setup of the evaporator as well as the exterior equipment to facilitate this. The process was modeled in ROOT and MATLAB, to provide an approximate deposition amount, and designs for ion sources, and mounting fixtures among others were created in AutoCAD. Throughout the process, numerous, multi-faceted, issues were to be addressed ranging from the required servicing of pumps to entirely new renderings of mounts and piping and leak testing. The processes of pumping down the system for vacuum, making changes to the cooling, cryogenic pumping, and reflectivity characterization amongst other topics will be discussed. While this paper primarily highlights the improvements to the evaporation system, there will be a specific focus on pfRICH samples and objectives as they provide the catalyst and criteria for current repairs.
