Abstract
An experimental setup was designed and fabricated to study superconducting wire motion under the influence of electromagnetic force. Experiments were conducted at 4.2 K by varying the experimental conditions such as the tension to the superconducting wire and different insulating materials at the interface of the superconducting wire and head part. The insulating materials used in the experiments were polyimide film and a high strength polyethylene fiber cloth, Dyneema. Details of the experimental setup and the test results are reported in this paper.
Highlights
Mechanical disturbances, such as wire motion, caused by the Lorentz force in magnet coils are the dominant source of performance degradation and a major concern in the design of large high field magnets [1]
The experiments on superconducting wire motion [5] in a magnetic field were carried out using small coils wound on stainless steel bobbins with polyimide film as the insulating material and with high strength polyethylene fiber (Dyneema: DF) reinforced plastic (DFRP) bobbins
It was found that voltage spikes generated due to sudden wire motion in the case of the DFRP bobbin were few and small in amplitude
Summary
Mechanical disturbances, such as wire motion, caused by the Lorentz force in magnet coils are the dominant source of performance degradation and a major concern in the design of large high field magnets [1]. Frictional heat generated by wire motion is one of the main causes of training in superconducting magnets [2]. The experiments on superconducting wire motion [5] in a magnetic field were carried out using small coils wound on stainless steel bobbins with polyimide film as the insulating material and with high strength polyethylene fiber (Dyneema: DF) reinforced plastic (DFRP) bobbins. It was found that voltage spikes generated due to sudden wire motion in the case of the DFRP bobbin were few and small in amplitude. The speculations are as follows: the negative thermal expansion of the DFRP bobbin restrains the wire motion and the low coefficient of friction between superconducting wire and DFRP bobbin reduces sudden motions
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