Measurement of Fast Transients in Nb3Sn Magnets by Using a Static Harmonic-Coil

IF 1.7 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity Pub Date : 2025-03-11 DOI:10.1109/TASC.2025.3550313

Piotr Rogacki;Lucio Fiscarelli;Arnaud Devred;Stephan Russenschuck

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引用次数: 0

Abstract

An induction-coil magnetometer has been produced at CERN to determine the location of an incipient quench in the HL-LHC Nb

$_{\text{3}}$

Sn inner-triplet quadrupoles. The instrument, known as a quench-antenna, allows the measurement of the position and propagation of quenches with a reduced number of acquisition channels. This is possible because four layers of nested coils are designed to be sensitive only to the normal and skew sextupole and octupole components. Moreover, the magnetometer allows the study of fast magnetic transients due to flux jumps observed during the ramping of Nb

$_{\text{3}}$

Sn superconducting accelerator magnets. This paper presents the observation and characterization of flux jumps during powering ramps similar to machine operations. Spatial and temporal distributions of flux jumps are derived from the induced voltages in the quench-antenna as a function of the transport current. Modeling flux jumps as traveling magnetic moments allows the reconstruction of the effect in terms of position and magnitude and, thus, an estimation of the impact on the magnetic field quality.

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利用静态谐波线圈测量 Nb3Sn 磁体中的快速瞬变

在欧洲核子研究中心生产了一个感应线圈磁力计，以确定HL-LHC Nb$_{\text{3}}$Sn内三重态四极中初始淬火的位置。该仪器，被称为淬火天线，允许测量的位置和传播的淬火与减少采集通道的数量。这是可能的，因为四层嵌套线圈被设计为仅对正常和倾斜六极和八极元件敏感。此外，磁力计允许研究由于Nb$_{\text{3}}$Sn超导加速器磁体在爬坡过程中观察到的通量跳变引起的快速磁瞬变。本文介绍了类似于机器操作的动力斜坡过程中通量跳跃的观察和表征。磁通跳变的时空分布是由猝灭天线的感应电压作为输运电流的函数推导出来的。将磁通跳跃建模为行进磁矩，可以根据位置和大小重建影响，从而估计对磁场质量的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Applied Superconductivity 工程技术-工程：电子与电气

CiteScore

3.50

自引率

33.30%

发文量

650

审稿时长

2.3 months

期刊介绍： IEEE Transactions on Applied Superconductivity (TAS) contains articles on the applications of superconductivity and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Large scale applications include magnets for power applications such as motors and generators, for magnetic resonance, for accelerators, and cable applications such as power transmission.