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Simulated Versus Experimentally Observed Quench Behavior of the HL-LHC Twin Aperture Orbit Corrector Prototype

机译:模拟与实验观察到的HL-LHC双孔径轨道校正器原型的淬火行为

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This paper discusses the simulated and experimentally observed quench behavior of the first HL-LHC Twin Aperture Orbit Corrector Prototype, also known as the MCBRDp1 magnet. This superconducting magnet features two independently powered apertures. Each aperture comprises two concentric canted-cosine-theta-type Nb-Ti/Cu coils that together generate a dipolar magnetic field over the bore. These coils are held in place by conductive aluminum-alloy formers. The circuit is protected by a combination of energy extraction and quench-back in the coils. When the coils are discharged over an energy extractor, eddy currents are generated in the formers, and the resulting heat quickly and efficiently brings the Nb-Ti/Cu strands above their current sharing temperature, provided that the resistive voltage over the energy extractor is sufficiently large. This paper compares simulations and experimental observations. It is shown that with the BBQ tool, the initial voltage development after a training quench is correctly reproduced. The ProteCCT simulation tool is shown to be consistent with experimentally observed discharges of the MCBRDp1 prototype for different bath temperatures, energy extractor types, and initial operating currents. The baseline energy extractor resistor value of 1.5;; and the non-linear varistor option both give worst-case hotspot temperatures below the 200 K hotspot temperature limit. At ultimate current, the resulting hotspot temperatures are 143 and 167 K, and the peak voltages-to-ground are 590 and 440 V, respectively.
机译:本文讨论了第一个HL-LHC双孔径轨道校正器原型的模拟和实验观察到的淬火行为,也称为MCBRDP1磁体。该超导磁体具有两个独立供电的孔。每个孔包括两个同心倾斜 - 余弦 - θ型NB-Ti / Cu线圈,它们一起在孔上产生双极磁场。这些线圈通过导电铝合金成型器保持就位。电路通过能量提取和淬火的组合来保护线圈。当线圈通过能量提取器排出时,在成型器中产生涡流,并且所得到的热量快速有效地将Nb-Ti / Cu股线上的电流共享温度提高,条件是能量提取器上的电阻电压充分大。本文比较了模拟和实验观察。结果表明,通过BBQ工具,正确再现训练淬火后的初始电压开发。 Protecct仿真工具被示出与实验观察到不同浴温,能量提取器类型和初始操作电流的MCBRDP1原型的放电一致。基线能量提取器电阻值1.5 ;;并且非线性压敏电阻选项都提供低于200K热点温度限制的最坏情况热点温度。在终极电流下,所得到的热点温度为143和167 k,分别为590和440V。

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