Analysis of thermal radiation shielding of vacuum furnace for brazing and bake-out of accelerator

¹ Department of Nuclear Engineering and Engineering Physics, Faculty of Engineering, Gadjah Mada University, Indonesia
² Research Center for Accelerator Technology, Research Organization for Nuclear Energy, National Research and Innovation Agency (BRIN)
³ Directorate of Laboratory Management, National Research and Innovation Agency (BRIN)

^* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract

An accelerator is a device that accelerates charged particles from low to high energy. It consists of several main components, which require specialized manufacturing processes, including brazing and bake-out carried out in a vacuum furnace at a pressure of 10⁻⁵ mbar. However, such a vacuum furnace is not yet available domestically and therefore needs to be designed and constructed locally. The design and construction began with an initial analysis of the vacuum furnace's thermal radiation shield. The vacuum furnace is planned to have a diameter of 105 cm and a length of 150 cm. Analysis was conducted using analytical calculations and simulations using ANSYS software for steady-state and transient conditions. The analysis results show that the use of three thermal radiation shields can significantly reduce electrical power and wall temperature at steady-state conditions, namely from 40,657 kW and 306.9°C without shields to 9,869 kW and 141.3°C for analytical calculations and 10,149 kW and 140.45°C for simulations using ANSYS software. Transient analysis shows that the heating power for a heating rate of about 40°C/min is 25 kW. This analysis can support the construction of vacuum furnaces for brazing and bake-out of accelerator components in Indonesia.