Analysis of Temperature Distribution Affected External Magnetic Field in Short-Arc Lamps Using Three-Dimensional Electromagnetic Thermal Fluid Simulation

An arc lamp is a light source with high brightness and excellent color rendering emitted from an arc formed between electrodes, with high radiant power density and high energy plasma state. In industrial applications of arc discharge, it is required to increase the luminance. One possible method is to increase the current value of the arc discharge, the Joule heating, and the temperature dependent radiation. It was confirmed that the increase in radiation was different for the width of the high temperature region and the maximum temperature of the gas. However, when the input power increases, the energy efficiency decreases because the heat loss becomes larger. In addition, it has been confirmed in our laboratory by the arc converges when a high-frequency rotating magnetic field is applied. The objective of this research is increased the high temperature region by contracting the arc using an external magnetic field, thus improving the radiation per power of the arc lamp. In this research, the arc temperature distribution of a short-arc lamp, which is affected by external magnetic field, was calculated using the 3-D electromagnetic thermal fluid simulation. As a result, the radiation efficiency to electric power could increase with applying an external magnetic field.