Thermal Stability of Conduction-Cooled YBCO Pancake Coil

Miyazaki, Hiroshi; Iwai, Sadanori; Tosaka, Taizo; Tasaki, Kenji; Hanai, S.; Urata, M.; Ioka, S.; Ishii, Yusuke

doi:10.1109/tasc.2010.2090122

Cited by 45 publications

(13 citation statements)

References 6 publications

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“…Reproduced from section 3.4.1.4, figure 3.14.coil's I c , the voltage across the coil drifts upwards over time, eventually leading to a quench. Similar behavior has been observed in literature[166][167][168]. For instance, Yanagisawa et al measured a 'premature thermal runaway' for a…”

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confidence: 80%

Conduction-cooled ReBCO coils for the wind converter: from laboratory to field test

Bergen

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Practical high-current applications of low-temperature superconductors (LTS) include magnetic resonance imaging, nuclear magnetic resonance and large magnet systems for high-energy physics and nuclear fusion. Higher magnetic fields and higher operating temperatures require a changeover to high-temperature superconductors (HTS) such as ReBCO. These ceramic materials have a critical temperature T c above the normal boiling point of nitrogen, which in principle allows them to be cooled by liquid nitrogen instead of liquid helium. Using liquid nitrogen instead of liquid helium can simplify the design of the cooling system for the superconducting application. A disadvantage of such a 'wet' magnet is the limited operating temperature range and the requirement of periodic refills which is problematic in the case of non-continuous supply of the cryogenic liquid. Use of cryocoolers, on the other hand, allows the superconducting magnet to be conduction-cooled also to intermediate temperatures. Gifford-McMahon type crycoolers are most commonly used today due to their relatively low cost and high reliability. The

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confidence: 80%

Conduction-cooled ReBCO coils for the wind converter: from laboratory to field test

Bergen

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“…Technologies to wind coils with negative bend are required for the magnets of spiral sector FFAG accelerators. Coils must be impregnated with epoxy resin to improve thermal conductivity for conduction cooling by using cryocooler [26]. R&D of these technologies are carried out in our project [10], [13].…”

Section: Winding Technologiesmentioning

confidence: 99%

Progress of Research and Development of Fundamental Technologies for Accelerator Magnets Using Coated Conductors

Amemiya

Goda

Otake

et al. 2013

IEEE Trans. Appl. Supercond.

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A project to develop the fundamental technologies for accelerator magnets using coated conductors is in progress. A coil-dominated magnet and an iron-dominated magnet were designed, based on the conceptual design of spiral sector FFAG (Fixed Field Alternating Gradient) accelerator for carbon cancer therapy and that for accelerator-driven subcritical reactor, respectively. The required winding technologies were clarified through designing the magnets, and the R&D of winding technologies for coils with three-dimensional shape and those with negative bend have been carried out. The influence of the magnetization of coated conductors on the field quality of magnets was studied experimentally.  Index Terms-accelerator magnets, coated conductors, FFAG accelerators, high temperature superconductors, magnetization.

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“…Because existing coated conductors are very difficult to handle, it is necessary to accurately understand the mechanical properties, particularly resistance to delamination, of the coated conductors in order to wind the coated conductors into a coil without degrading their performance. Regarding round pancake coils of coated conductors, we have succeeded in accumulating winding technologies through the experimental production of several compact coils and fabricating resin-impregnated coils that are free of such performance degradation [8]. For the present project, we have applied the winding technologies acquired through the prototyping of round coils to racetrack coils, which have basic shapes suitable for use with accelerator magnets.…”

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confidence: 99%

Fabrication of YBCO Small Test Coils for Accelerator Magnet Development

Koyanagi

Tosaka

Tasaki

et al. 2012

IEEE Trans. Appl. Supercond.

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A research program for studying coil winding technologies using (YBCO) coated conductors is now in progress. In this program, we are attempting to develop highsuperconducting magnets for highly functional, efficient, and compact accelerator systems. In designing superconducting coils with thin tape conductors, we must be concerned about magnetization of the superconducting layer. In order to experimentally evaluate the influence of the additional field resulting from the magnetization current, prototype racetrack coils were constructed with YBCO coated conductors. A 62 m length of coated conductor was wound to form each of the coils, which were then impregnated with epoxy resin. For precise analysis of the additional magnetic field, it is essential to fabricate superconducting coils without degradation because the voltage generated at such a degraded part would affect the behavior of the additional magnetic field. In a liquid nitrogen environment, the racetrack coils were energized to evaluate the voltage-current (V-I) characteristics. It was found that there was no degradation in the superconductivity. The V-I characteristics showed sufficiently high index values of 28 and 34 throughout an electric field range of . Magnet design derived from accelerator design, as well as construction of an experimental reduced-scale coil in a typical shape, are also discussed.

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Thermal Stability of Conduction-Cooled YBCO Pancake Coil

Cited by 45 publications

References 6 publications

Conduction-cooled ReBCO coils for the wind converter: from laboratory to field test

Conduction-cooled ReBCO coils for the wind converter: from laboratory to field test

Progress of Research and Development of Fundamental Technologies for Accelerator Magnets Using Coated Conductors

Fabrication of YBCO Small Test Coils for Accelerator Magnet Development

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