BES Ⅲ束流管温度场的数值模拟及实验研究
Numerical Simulation and Experimental Study of Temperature Field of BES Ⅲ Beam Pipe
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摘要: 束流管安装在北京谱仪（BES Ⅲ）子探测器漂移室的内筒，新一代北京正负电子对撞机（BEPC Ⅱ）在运行时将会有更多的同步辐射和高次模辐射热负荷作用于束流管的内表面，过高的热量和过大的温度变化幅度将会影响漂移室的正常粒子的探测。本文对束流管温度场进行了有限元数值模拟和实验研究，并对漂移室内筒的内壁面温度进行了数值分析。结果表明，当束流管内壁辐射热负荷在0～750 W变化时，设定束流管的中心管冷却油和外延管冷却水的进口温度分别为291.4 K和291.6 K，可将漂移室内筒的内壁温度控制在292.8~293.9 K，满足（293±2）K的要求，保证了BES Ⅲ的精确粒子探测和BEPCⅡ的正常运行。Abstract: The beam pipe is installed in the inner cylinder of the drift chamber (DC) which is one of the detectors of Beijing Spectrometer Ⅲ (BES Ⅲ). There will be much more heat on the inner surface of the beam pipe, which is mainly from synchrotron radiation and high order mode radiation when the new generation Beijing Electron and Positron Collider (BEPC Ⅱ) is operating. Continuous high temperature or large temperature fluctuation can cause the DC to detect particles abnormally. Therefore, the temperature field of the beam pipe was researched by means of the finite elements simulation and experiments, and the temperature of the inner wall of the DC inner cylinder was studied based on the numerical analysis. The result shows that the temperature of the cooling oil and cooling water for the central pipe and the extending pipe of the beam pipe should be set on 291.4 K and 291.6 K respectively when the radiation heat on the inner surface of the beam pipe is 0.750 W. On this condition, the inner surface temperature of the DC inner cylinder can be controlled in the range of 292.8-293.9 K, which satisfies the requirement of （293±2）K and provides guarantee for the BES Ⅲ detecting particles accurately and the BEPC Ⅱ operating normally.
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Keywords:
- BES Ⅲ ,
- beam pipe ,
- temperature ,
- numerical simulation ,
- experiment
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