First Experiment on Levitation and Plasma With HTS Magnet in the RT-1 Plasma Device

Tosaka, Taizo; Ohtani, Y.; Ono, M.; Kuriyama, T.; Mizumaki, S.; Nakamoto, K.; Tachikawa, N.; Morikawa, Junji; Ogawa, Yuichi; Yoshida, Zensho

doi:10.1109/tasc.2007.899874

Cited by 7 publications

(7 citation statements)

References 7 publications

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“…Just after cooling down to ∼20 K, the transfer tubes were disconnected from the internal coil, and the spontaneous temperature increase in each component inside the internal coil was monitored. After 8 h, the temperature of the HTS coil increased to ∼30 K and that of the thermal shield to ∼100 K. This confirms that the performance of the thermal shield might be satisfactory for plasma experiments [17].…”

Section: Operation Of Rt-1 41 Cooling and Excitation Of The Hts Coilsupporting

confidence: 66%

“…We paid attention to minimize the magnetic field produced by these connection lines, because an error field would induce deterioration of the magnetic field for the plasma confinement and rotation of the floating coil in the toroidal direction. As a result, by properly distributing the connection lines in the toroidal direction, the maximum magnetic field error on the surface of the internal coil is suppressed to less than 0.2% of the dominant dipole field [17].…”

Section: High-temperature Superconductor Tapementioning

confidence: 99%

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Construction and Operation of an Internal Coil Device, RT-1, with a High-Temperature Superconductor

Ogawa

Yoshida

Morikawa

et al. 2009

Plasma and Fusion Research

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An internal coil device called Ring Trap-1 (RT-1) has been constructed to explore an innovative concept for a high-beta plasma based on a new relaxation theory. A high-temperature superconductor (HTS) Bi-2223 tape is employed for the internal coil of RT-1. The coil is cooled to 20 K with helium gas supplied by G-M refrigerators, and charged to a magnetomotive force of 250 kA using an external power supply. For these cooling and charging methods, we have developed several innovative techniques such as a demountable transfer tube system, persistent current switch, detachable electrode, and others. In addition, we have paid much attention to the deterioration of the HTS tape during the fabrication of the internal coil. As a result, we have demonstrated that the decay of the persistent current of the internal coil is ∼1% during 8 h. The internal coil is lifted with a levitation coil located at the upper region of the vacuum vessel. The coil position monitored with laser sensors is feedback controlled through the regulation of the levitation coil current. Stable levitation for a few hours has been demonstrated for various plasma experiments.

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Section: Operation Of Rt-1 41 Cooling and Excitation Of The Hts Coilsupporting

confidence: 66%

Section: High-temperature Superconductor Tapementioning

confidence: 99%

Construction and Operation of an Internal Coil Device, RT-1, with a High-Temperature Superconductor

Ogawa

Yoshida

Morikawa

et al. 2009

Plasma and Fusion Research

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“…HTS is now under consideration within the fusion community. One of the most recent projects is a levitated dipole for the RT-1 plasma device [26].…”

Section: B Performance and Design Requirementsmentioning

confidence: 99%

Challenges and Prospects for the Large-Scale Application of Superconductivity

Gourlay

2008

IEEE Trans. Appl. Supercond.

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The large-scale use of superconductivity continues to be dominated by applications for which there is generally no conventional option. In these cases, superconductivity has enabled new science and technology that could not exist without it. The fields of fusion energy and high-energy physics (HEP) have particularly benefited from the application of superconductivity. High magnetic fields are absolutely necessary to achieve the required performance parameters. Even though superconductivity is an enabling technology for these fields, it comes with a number of challenges and market incursion has been very slow. However, thanks to persistent ongoing research, improvements in ancillary technology, and the development of new materials, the field is far from exhausted. On the contrary, many new applications in addition to high field magnets for scientific research and medical applications are on the horizon. Several applications are on the verge of accomplishing the much more difficult task of replacing existing conventional technology. This paper summarizes the current status of large-scale applications of superconductivity, using as an example magnet technology for fusion and HEP, and examines the prospects and challenges for new large-scale applications in the future.

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“…The first fusion magnets were built using NbTi but moved quickly to Nb 3 Sn due to the need for higher fields and there is even significant activity in the development of HTS coils. One of the most recent projects is a levitated dipole for the RT-1 plasma device 14) .…”

Section: Fusion Magnetsmentioning

confidence: 99%

Challenges and Prospects for the Large Scale Application of Superconductivity in High Energy Physics and Fusion Programs

Gourlay

2007

TEION KOGAKU

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Synopsis:The large scale use of superconductivity continues to be dominated by applications for which there is generally no conventional option. In these cases, superconductivity has enabled new science and technology that could not exist without it. Thanks to persistent ongoing research, new ancillary technology and the development of new materials, the field is far from exhausted. The fields of fusion energy and high energy physics (HEP) have particularly benefited from the application of superconductivity. High magnetic fields are absolutely necessary to achieve the required performance parameters. Even though superconductivity is an enabling technology for these fields, it comes with a number of challenges. The progress in development of applications is driven from one side by the available materials and on the other, by the evolution, or sometimes revolution, in ancillary technologies. Technology for use in both fusion and accelerator magnets begins with the same materials and inherent constraints, yet results in substantially different configurations and unique challenges due to the operational requirements for the respective applications. This paper presents a comparison of the technology developed by the fusion and high energy physics programs, both the similarities and the differences, and prospects for future development.

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First Experiment on Levitation and Plasma With HTS Magnet in the RT-1 Plasma Device

Cited by 7 publications

References 7 publications

Construction and Operation of an Internal Coil Device, RT-1, with a High-Temperature Superconductor

Construction and Operation of an Internal Coil Device, RT-1, with a High-Temperature Superconductor

Challenges and Prospects for the Large-Scale Application of Superconductivity

Challenges and Prospects for the Large Scale Application of Superconductivity in High Energy Physics and Fusion Programs

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