Journal ArticleDOI
Quench detection of superconducting magnets using ultrasonic wave
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TLDR
In this article, an ultrasonic quench detection method for superconducting magnets is presented, which monitors the change of the acoustic transfer function induced by a local temperature rise or an epoxy crack.Abstract:
An ultrasonic quench-detection method for superconducting magnets is presented. This nondestructive method monitors the change of the acoustic transfer function of a superconducting magnet induced by a local temperature rise or an epoxy crack. Experiments were carried out on a small epoxy-impregnated magnet. The experimental results show that a local temperature rise of about 2-3 K can be detected by this method. It is concluded that the technique can provide early quench warning by monitoring continuously the change of the acoustic transfer function of the magnet. >read more
Citations
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Journal ArticleDOI
Strain-based quench detection for a solenoid superconducting magnet
TL;DR: In this article, a non-electric quench detection method based on the strain gauge measurement of a superconducting solenoid magnet at cryogenic temperature under an intense magnetic field is presented.
Journal ArticleDOI
Quench Detection for High-Temperature Superconductor Conductors Using Acoustic Thermometry
TL;DR: In this paper, an active acoustic technique for detecting localized heating in a 1.2m-long sample of REBCO tape immersed in liquid nitrogen is presented. And the authors adapt this technique to subscale coils wound with a two-layer canted CORC dipole assembly.
Journal ArticleDOI
Acoustic thermometry for detecting quenches in superconducting coils and conductor stacks
M. Marchevsky,S. A. Gourlay +1 more
TL;DR: In this article, the authors proposed a quench detection technique based on sensing local temperature variations in the bulk of a superconducting winding by monitoring its transient acoustic response, which is mainly aimed at coils and devices built with high-temperature superconductor materials.
Journal ArticleDOI
Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets
TL;DR: In this paper, the authors discuss various approaches to mitigating the normal zone propagation velocity in high-temperature superconductor materials, specifically focusing on recently developed non-voltage techniques for quench detection.
Journal ArticleDOI
Quench detection method without a central voltage tap by calculating active power
N. Nanato,Koichi Nakamura +1 more
TL;DR: In this article, an inductive voltage detection coil is used instead of the central voltage tap for detecting quench of a large AC superconducting coil, and the authors show the feasibility of the proposed method for detecting the quench in Bi-2223/Ag HTS coil.
References
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Journal ArticleDOI
Method to detect a temperature rise in superconducting coils with piezoelectric sensors
TL;DR: In this article, a shift in the frequency spectrum of a structure induced by a local temperature rise is measured, which is in turn caused by local perturbation in the temperature distribution in the structure.
Journal ArticleDOI
Monitoring of superconducting magnets using acoustic resonance
TL;DR: In this article, a method to monitor a superconducting magnet is presented that utilizes a change in acoustic resonance frequency induced by events such as a local temperature rise or crack in epoxy.
Journal ArticleDOI
III. Examples of AE from Superconducting Magnets
Takeshi Ishigohka,Akira Ninomiya +1 more
TL;DR: In this paper, a method to detect a quench of superconducting magnets by acoustic resonance is presented, which utilizes the change of propagation characteristics of acoustic wave which is injected by a piezoelectric element (driver) into a superconding magnet.