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Heat transfer enhancement of NBI vacuum pump cryopanels

机译:NBI真空泵低温板的传热增强

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Huge cryogenic pumps are installed inside neutral beam injectors in order to manage the typically very large gas flows. This paper deals with the aspect of passive cooling in NBI cryopump design development and discusses design considerations in two example areas. One is the design of cryopanels consisting of a pipe, centrally supplied with cryogenic helium, and a welded fin, passively cooled, to provide the necessary pumping surface below a given maximum temperature. The results of several parametric simulations in ANSYS are presented using different copper thicknesses and cryopanel geometries to discuss the thermal capability (heat transfer characteristics and heat capacities) of a number of design variants. The optimum design solution is based on copper-coated fins, using an electroplating technique, and thereby improving the heat transfer of the cryopanels while attaining an overall reduction in weight. The other area is the sound design of the manifold shielding system with a weld contact between copper and stainless steel. Weld samples were manufactured and investigated to raise awareness of the demands and risks during manufacturing and to demonstrate that readily applicable weld procedures exist.
机译:巨大的低温泵安装在中性束注入器内,以管理通常非常大的气流。本文讨论了NBI低温泵设计开发中的被动冷却方面,并在两个示例区域中讨论了设计注意事项。一种是低温板的设计,包括由中央供有低温氦气的管和被动冷却的焊接翅片组成,以在给定的最高温度以下提供必要的泵送表面。给出了使用不同的铜厚度和低温板几何形状在ANSYS中进行的几个参数模拟的结果,以讨论多种设计变型的热容量(传热特性和热容量)。最佳设计解决方案是基于铜翅片,采用电镀技术,从而在总体上减轻了重量的同时改善了低温板的热传递。另一个领域是歧管屏蔽系统的合理设计,铜和不锈钢之间采用焊接接触。对焊接样品进行了制造和调查,以提高对制造过程中的需求和风险的意识,并证明存在易于实施的焊接程序。

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