Numerical Study of Temperature Field in BEPCII Interaction Region

The temperature field of the beam pipe was calculated at the maximum heat loads and designed flow rates of the cooling liquids. The maximum difference between the predicted and measured temperature on the outer surface of the beam pipe was found to be 0.6 K. In addition, the temperature field between the beam pipe and the inner barrel of the main drift chamber (MDC) was calculated assuming natural convection heat transfer of the air in the enclosed cavity under three different conditions. The results of the calculation showed that only the use of insulation covers on the transition sections of the beam pipe keeps the temperature of the inner barrel in the range of 293.0±1.0 K. The thermal conductivity of the heat insulators under the heat insulation covers must be less than 0.5 W/(m·K).