Fabrication and test of a racetrack magnet using pre-reacted Nb3Sn cable
Fabrication and test of a racetrack magnet using pre-reacted Nb3Sn cable
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发表时间：
2002-12
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通讯作者：
G. R. E. al.
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作者：
G. R. E. al.
在费米实验室研制了一种采用Nb{sub 3}Sn超导电缆绕制的跑道磁体。它由两个扁平跑道线圈组成，连接在一个共同的线圈配置，由5毫米厚的玻璃纤维板分开。在热处理过程中，使用合成油防止股线烧结。将线圈缠绕并真空浸渍在机械结构中。由Kapton{reg_sign}和与电缆一样宽的预浸渍玻璃纤维带组成的匝间绝缘层与裸电缆缠绕在一起，以形成连续的匝间间隔。线圈上装有电压抽头、温度传感器、点加热器和淬火加热器。达到的最大电流为12675 A，为5.1 K时短样本限值的78%（75 A/s斜坡期间线圈中的最低温度）。温度裕度的测量揭示了最内侧匝的低退化。淬火性能在不同的温度和斜坡率的影响进行了测量，并提出和讨论。
A racetrack magnet, using Nb{sub 3}Sn superconducting cable reacted before winding, has been fabricated and tested at Fermilab. It consists of two flat racetrack coils, connected in a common-coil configuration, separated by a 5 mm thick fiberglass plate. Synthetic oil was used to prevent sintering of the strands during the heat treatment. The coils were wound and vacuum impregnated in the mechanical structure. The turn-to-turn insulation, consisting of Kapton{reg_sign}and pre-impregnated fiberglass tapes as wide as the cable, was wound together with the bare cable in order to form a continuous inter-turn spacer. The coils were instrumented with voltage taps, temperature sensors, spot heaters and quench heaters. The maximum current achieved was 12675 A which is 78% of the short sample limit at 5.1 K (minimum temperature in the coil during 75 A/s ramp). Measurement of the temperature margin revealed a low degradation in the innermost turns. Quench performances at different temperatures and ramp rate effects have been measured and are presented and discussed.