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首页> 外文会议> >Time decay measurements of the sextupole component of the magnetic field in a 4-cm aperture, 17-m-long SSC dipole magnet prototype
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Time decay measurements of the sextupole component of the magnetic field in a 4-cm aperture, 17-m-long SSC dipole magnet prototype

机译：孔径为4 cm，长为17 m的SSC偶极磁体原型中磁场六极分量的时间衰减测量

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摘要

A systematic series of measurements of the time decay of the sextupole component of the magnetic field in a full-length SSC (Superconducting Super Collider) dipole magnet prototype was carried out in order to characterize the mechanisms involved. At least two mechanisms have been isolated. The first is a slow logarithmic decay which is independent of the excitation history of the magnet. This component is stopped by a decrease of the magnet temperature and is identified with flux creep. The second component, which is not yet fully understood, only appears when the magnet is pre-cycled to a high level of current, and cannot be stopped by decreasing the magnet temperature. The first component is attributed to flux creep in the superconductor. The authors are currently developing a model of demagnetization caused by shifting/transport currents in the superconducting cables that could account for the secondary component.
机译：为了表征所涉及的机制，对全长SSC（超导超对撞机）偶极磁体原型中的磁场六极分量的时间衰减进行了系统的一系列测量。至少有两种机制已被隔离。第一个是缓慢的对数衰减，它与磁体的励磁历史无关。该分量通过降低磁体温度而停止，并通过磁通量蠕变来识别。尚未完全理解的第二成分仅在磁体被预循环至高电流水平时出现，并且无法通过降低磁体温度而停止。第一个分量归因于超导体中的磁通蠕变。作者目前正在开发一种由超导电缆中的移位/传输电流引起的退磁模型，该电流可解释次级分量。

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