Radiation Analysis and Design Study of Unified Cooling and Baking Scheme for SMARTEX-C

Abstract

In this paper, a unified cooling and baking scheme has been designed and analyzed, which aids in maintaining the vacuum levels of an experimental system SMARTEX-C. It is a SMall Aspect Ratio Toroidal Experiment in a ‘C’ (SMARTEX-C) shaped geometry. It is a trap meant for confining electron plasma i.e. non-neutral plasma. A vacuum ∼ (1.5 ± 0.5) x 10−10 mbar is maintained inside the vessel. Electrons are emitted from a heated tungsten filament, which eventually deteriorates the vacuum of the vessel with time. To perform reproducible electron plasma experiments it is essential to maintain vacuum levels constant. The designed cooling scheme helps in maintaining it. Additionally, flow of hot Nitrogen has been incorporated in this scheme which serves baking of the vacuum vessel making the dedicated baking system redundant and makes the operation of the system hassle-free. The scheme is modeled in CATIA© and analyzed in ANSYS CFX©. The thermal-hydraulic performance has been analyzed and parametric results in terms of temperature, heat transfer coefficient and pressure drop have been provided for the cooling and baking of the vessel.