Stability of HTS current leads considering unstable equilibrium temperature profile

Machata, K.; Mizokami, Y.; Ishihashi, K.; Takeo, M.; Mito, Takayuki; Yamamoto, Junpei

doi:10.1109/77.614595

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…Since the heat leakage through the leads is a major factor in heat budget Manuscript for many high-field magnets, a number of lead designs to minimize the cryogenic load have been proposed and developed [3]- [7]. We have proposed the concept of the semi-retractable HTS current lead that will be applied to a 21 T FT-ICR magnet system [8].…”

Section: Introductionmentioning

confidence: 99%

Semi-Retractable Current Leads for a 21 T FT-ICR Magnet System

Choi¹,

Painter

Kim

et al. 2008

IEEE Trans. Appl. Supercond.

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The development of the semi-retractable current leads for a 21 T Fourier Transform Ion Cyclotron Resonance (FT-ICR) superconducting magnet system is presented. The semi-retractable current leads are composed of a normal metal element, conducting the current from room temperature to intermediate temperature, and an HTS element, conducting the current down to liquid helium temperature. An HTS element is partly immersed in liquid helium and the joint between the normal metal and HTS element is continuously refrigerated by a cryocooler. After magnet energization the metal element is disengaged from the HTS element without breaking vacuum to the insulating vacuum space. In the paper, the optimized dimensions of the leads are presented in order to minimize the thermal heat load when carrying operational current with some margin. The intermediate block with a lockable set point and the insulating vacuum system are fabricated and the adaptability and reliability are tested during engage and disengage performance. The effects of vacuum level and performance cycle on the electrical contact resistance in a lockable set are also investigated.

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Section: Introductionmentioning

confidence: 99%

Semi-Retractable Current Leads for a 21 T FT-ICR Magnet System

Choi¹,

Painter

Kim

et al. 2008

IEEE Trans. Appl. Supercond.

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Semi-Retractable Current Lead Cooled by a Cryocooler for High Field Magnet

Choi

Painter²,

Kim

et al. 2009

IEEE Trans. Appl. Supercond.

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The semi-retractable current lead cooled by a cryocooler is designed for a high field superconducting magnet system. The semi-retractable current lead is composed of a normal metal element, conducting the current from room temperature to an intermediate temperature, and an HTS element, conducting the current down to liquid helium temperature. An HTS element and the joint between the normal metal and HTS element are connected to a two-stage cryocooler. The intermediate joint carries current through a strip of louvered material. After charging the normal metal element is disengaged from the HTS element without breaking vacuum in the insulating space. The semi-retractable current lead is fabricated and assembled with a two-stage cryocooler for feasibility test. The adaptability and reliability of the lead are tested during engage and disengage performance. The electrical contact resistance is also measured in the intermediate joint with respect to the vacuum level and temperature has been measured.

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Stability of HTS current leads considering unstable equilibrium temperature profile

Cited by 2 publications

References 5 publications

Semi-Retractable Current Leads for a 21 T FT-ICR Magnet System

Semi-Retractable Current Leads for a 21 T FT-ICR Magnet System

Semi-Retractable Current Lead Cooled by a Cryocooler for High Field Magnet

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