Heat Drain Effects From HTS Tapes to High Thermal Conduction Plastics for Conduction-Cooled Magnets

Takao, T.; Watanabe, Atsushi; Takiyama, Takeshi; Nakamura, Kazuya; Yamanaka, Akihiro

doi:10.1109/tasc.2007.899882

Cited by 6 publications

(6 citation statements)

References 8 publications

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“…Thermal conductivity of DFRP-50 is higher than that of GFRP-50 and lower than that of AlN. Therefore, the difference of the data in the GFRP-50, DFRP-50, and AlN is due to thermal conductivity of the clamping materials and heat transfer from the Bi tape to the clamping materials [38]. It is known that the voltage rise becomes slower by increasing content ratio of DF and contact stress to Bi tape in the case of DFRP [38].…”

Section: Heat Drain Effects From Hts Tapes To High-strengthmentioning

confidence: 94%

“…The voltages of the tape clamped by GFRP-50, DFRP-50, and AIN are shown in Figure 17. As shown in Figure 18, when the clamping material is the AlN, the voltage keeps relatively low, that is to say, the temperature rise of the tape is very slow [38]. On the contrary, the voltage of the GFRP-50 took off within a short time from the current start, and the temperature rise of the tape was fast [38].…”

Section: Heat Drain Effects From Hts Tapes To High-strengthmentioning

confidence: 98%

“…Polyethylene-Fiber-Reinforced Plastics [38]. In this section, the heat drain effect of the DFRP with a steady-state current to the HTS tape is reported.…”

Section: Heat Drain Effects From Hts Tapes To High-strengthmentioning

confidence: 99%

“…DFRP, GFRP, and AlN were used as structural materials in Figure 16 Table 1. The set of the clamping materials, the clamped tape, and the weight is on a cold head of a refrigerator and is cooled down to 77 K. A steady current of 60 A, which equaled to the critical current of the Bi tape, was applied to the tape, and the voltage between the tapes was observed [38]. The voltages of the tape clamped by GFRP-50, DFRP-50, and AIN are shown in Figure 17.…”

Section: Heat Drain Effects From Hts Tapes To High-strengthmentioning

confidence: 99%

“…Therefore, the difference of the data in the GFRP-50, DFRP-50, and AlN is due to thermal conductivity of the clamping materials and heat transfer from the Bi tape to the clamping materials [38]. It is known that the voltage rise becomes slower by increasing content ratio of DF and contact stress to Bi tape in the case of DFRP [38]. It is considered that the negative thermal expansion of DFRP contributes to increasing contact stress in the HTS coil.…”

Section: Heat Drain Effects From Hts Tapes To High-strengthmentioning

confidence: 99%

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Thermal Conductivity of High-Strength Polyethylene Fiber and Applications for Cryogenic Use

Yamanaka

Takao

2011

ISRN Materials Science

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The local temperature rise of the tape is one of instabilities of the conduction-cooled high temperature superconducting (HTS) coils. To prevent the HTS tape from locally raising a temperature, high thermal conductive fiber reinforced plastic was applied to coil bobbin or spacer for heat drain from HTS tape. The thermal conductivity of ramie fibers increases by increasing orientation of molecular chains with drawing in water, and decreases by chain scission with γ-rays irradiation or by bridge points in molecular chains with vapor-phase-formaldehyde treatments. Thermal conductivity of high strength ultra-high-molecular-weight (UHMW) polyethylene (PE) fiber increases lineally in proportion to tensile modulus and decreases by molecular chain scissions with γ-rays irradiation. This result suggested the contribution of the long extended molecular chains due to high molecular weight on the high thermal conductivity of high strength UHMW PE fiber. Thermal conductivity of high strength UHMW PE fiber reinforced plastics in parallel to fiber direction is proportional to the cross sectional ratio of reinforcement oriented in the conduction direction. Heat drain effect of high strength UHMW PE fiber reinforced plastic from HTS tape is higher than that of glass fiber reinforced plastic (GFRP) and lower than that of aluminum nitride (AlN). In the case of HTS coil, the thermal stability wound on coil bobbin made of high strength UHMW PE fiber reinforced plastic is good as that of AlN, and better than that of GFRP.

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Section: Heat Drain Effects From Hts Tapes To High-strengthmentioning

confidence: 94%

Section: Heat Drain Effects From Hts Tapes To High-strengthmentioning

confidence: 98%

“…Polyethylene-Fiber-Reinforced Plastics [38]. In this section, the heat drain effect of the DFRP with a steady-state current to the HTS tape is reported.…”

Section: Heat Drain Effects From Hts Tapes To High-strengthmentioning

confidence: 99%

Section: Heat Drain Effects From Hts Tapes To High-strengthmentioning

confidence: 99%

Section: Heat Drain Effects From Hts Tapes To High-strengthmentioning

confidence: 99%

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