The single pancake HTS coil (inner diameter (ID) 85 mm, outer diameter (OD) 96.5 mm, 35 turns) was investigated under axial pressure up to 12 tons in liquid nitrogen to test the influence of axial pressure on critical properties in a central plane of designed HTS double pancake–based 3 T solenoid magnet for magnetic refrigeration machine. It was shown that 15-μm thick Al₂O₃ oxidized coating of the aluminum disk (which was used as a heat-conducting structure) is stable (in terms of breakdown voltage and mechanical strength) with such a loading. Critical current of pancake coil does not change with axial compression up to 30 MPa pressure and starts to decrease irreversibly if P > 30 MPa. Designed axial pressure level in 3 T magnet does not exceed this permissible boundary.

中文翻译：

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轴向压力对薄煎饼高温超导线圈参数的影响

在液态氮中，在轴向压力高达12吨的条件下，研究了单个煎饼HTS线圈（内径（ID）85毫米，外径（OD）96.5毫米，35匝），以测试轴向压力对中心材料关键性能的影响基于HTS双煎饼的3 T电磁制冷机的平面。结果表明，铝盘的15μm厚的Al ₂ O ₃氧化涂层（用作导热结构）在这种载荷下是稳定的（击穿电压和机械强度）。煎饼线圈的临界电流在轴向压力高达30 MPa时不会随轴向压缩而变化，并且如果P不可逆地开始减小 > 30 MPa。3 T磁体中的设计轴向压力水平不超过此允许边界。