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Overloaded Current Leads

机译：过载的电流引线

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Often supercondcuting magnets areoperated at a full (nominal) current briefly - during some portion of a whole time. In theses cases, liquid helium evaporation due to conventional gas-cooled current leads averaged over a duty cycle can be considerably reduced provided the leads are designed overloaded at a nominal current. Maximum overloading factor depends on the leads' material and the leads' acceptable maximum temperature, while optimum overloading factor (at which the time-averaged evaporation reaches its minimum) dependens also on a duty cycle. By detailed computer simulation, it is shown that gas-cooled current leads made from metal allows like brass possess larger acceptable overloading factor as compared to those made from relatively poure metal like copper. For example, helimum evaporation at a nominal current due to three times overloaded brass leads is only about 10
机译：通常在一整个时间的一部分内短暂地在完整（标称）电流下均匀的超金属晶体。 在这些情况下，由于在标称电流下重载过载，因此可以显着降低由于占空比的传统气体冷却电流引线引起的液氦蒸发。 最大过载因子取决于引线材料和引线可接受的最大温度，而最佳的重载系数（时间平均蒸发达到其最小值）也取决于占空比。 通过详细的计算机仿真，显示由金属制成的气体冷却电流引线，如黄铜具有更大的可接受的过载系数，与铜相对浇注的金属制成的那些相比。 例如，由于三次过载的黄铜引线，标称电流的高速蒸发仅为10

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