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首页> 外文期刊>IEEE Transactions on Applied Superconductivity >AC loss and contact resistance in copper-stabilized Nb/sub 3/Al Rutherford cables with and without a stainless steel core
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AC loss and contact resistance in copper-stabilized Nb/sub 3/Al Rutherford cables with and without a stainless steel core

机译：带和不带不锈钢芯的铜稳定Nb / sub 3 / Al Rutherford电缆的交流损耗和接触电阻

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摘要

Calorimetric measurements of AC loss and hence interstrand contact resistance (ICR), were measured on three samples of Rutherford cable wound with Cu-stabilized jelly-roll type unplated Nb/sub 3/Al strand. One of the cable types was furnished with a thin core of AISI 316L stainless steel and the other two were both uncored but insulated in different ways. The cables were subjected to a room-temperature-applied uniaxial pressure of 12 MPa that was maintained during the reaction heat treatment (RHT), then vacuum impregnated with CTD 101 epoxy, and repressurized to 100 MPa during AC-loss measurement. The measurements were performed at 4.2 K in a sinusoidal field of amplitude 400 mT at frequencies of 1 to 90 MHz (no DC-bias field) that was applied both perpendicular and parallel to the face of the cable (the face-on, FO, and edge-on, EO, directions, respectively). For the cored cable the FO-measured effective ICR (FO-ICR), was 5.27 /spl mu//spl Omega/. Those for the uncored cables were less than 0.08 /spl mu//spl Omega/. As shown previously for NbTi- and Nb/sub 3/Sn-based Rutherford cables, the FO-ICR can be significantly increased by the insertion of a core, although in this case it is still below the range recommended for accelerator-magnet use. Post-measurement dissection of one of the cables showed that the impregnating resin had permeated between the strands and coated the core with a thin, insulating layer excepting for some sintered points of contact. In the uncored cables the strands were coated with resin except for the points of interstrand contact. It is suggested that in the latter case this tendency for partial coating leads to a processing-sensitive FO-ICR.
机译：交流损耗的量热测量，以及由此产生的线间接触电阻（ICR），是在三个用铜稳定的果冻卷型未镀Nb / sub 3 / Al绞线缠绕的Rutherford电缆样品上进行的。其中一种电缆配有AISI 316L不锈钢的薄芯，另外两种电缆都没有芯，但是绝缘方式不同。使电缆经受在反应热处理（RHT）期间保持的室温施加的12 MPa单轴压力，然后用CTD 101环氧树脂真空浸渍，并在AC损耗测量期间重新加压至100 MPa。测量是在4.2 K的正弦波场中进行的，振幅为400 mT，频率为1到90 MHz（无直流偏置场），并垂直和平行于电缆的表面（面朝上，FO，和边缘上的EO方向）。对于有芯电缆，FO测量的有效ICR（FO-ICR）为5.27 / spl mu // spl Omega /。无芯电缆的那些值小于0.08 / spl mu // spl Omega /。如先前针对基于NbTi和Nb / sub 3 / Sn的Rutherford电缆所示，可通过插入铁芯来显着提高FO-ICR，尽管在这种情况下，它仍低于加速器磁铁使用的建议范围。测量后对其中一根电缆的解剖表明，浸渍树脂已经渗透到绞合线之间，并在芯层上覆盖了一层薄的绝缘层，除了一些烧结的接触点。在无芯电缆中，除股间接触点外，股线均涂有树脂。建议在后一种情况下，这种部分涂覆的趋势导致对加工敏感的FO-ICR。

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