Experimental Results of the HTS Floating Coil Using REBCO Tapes for the Mini-RT Upgrading

The upgrading plan of the Mini-RT which is an experimental device for plasma physics was initiated to replace the magnetically-levitated high temperature superconducting (HTS) coil by the new one wound with the latest REBCO tapes. The performance of the new HTS coil has been examined at the National...

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Veröffentlicht in:IEEE transactions on applied superconductivity 2014-06, Vol.24 (3), p.1-4
Hauptverfasser: Natsume, K., Tomioka, A., Itoh, I., Takada, E., Konno, M., Ohaku, M., Terazaki, Y., Mito, T., Yanagi, N., Ogawa, Y., Morikawa, J., Uchijima, K., Hosaka, Y., Nose, S.
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container_issue 3
container_start_page 1
container_title IEEE transactions on applied superconductivity
container_volume 24
creator Natsume, K.
Tomioka, A.
Itoh, I.
Takada, E.
Konno, M.
Ohaku, M.
Terazaki, Y.
Mito, T.
Yanagi, N.
Ogawa, Y.
Morikawa, J.
Uchijima, K.
Hosaka, Y.
Nose, S.
description The upgrading plan of the Mini-RT which is an experimental device for plasma physics was initiated to replace the magnetically-levitated high temperature superconducting (HTS) coil by the new one wound with the latest REBCO tapes. The performance of the new HTS coil has been examined at the National Institute for Fusion Science. The coil was indirectly cooled to 35 K by forced flow of cold helium gas. The coil was successfully excited up to 100 A with a proper persistent current switch (PCS) operation. The central field given by the Hall probe was 0.21 T, which was the same with that expected by a numerical calculation. The time constant of the current decay during the persistent current mode was evaluated at the coil temperature of 36 and 41 K to be 306 and 228 h, respectively. These values are consistent with the estimation based on the measured joint resistances and they are much longer than that of the previous floating coil of Mini-RT wound 10 years ago (41 h before aged deterioration). By the test results, it has been confirmed that the promising performance of the manufactured REBCO floating coil has been achieved to further promote the Mini-RT project.
doi_str_mv 10.1109/TASC.2013.2287706
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The performance of the new HTS coil has been examined at the National Institute for Fusion Science. The coil was indirectly cooled to 35 K by forced flow of cold helium gas. The coil was successfully excited up to 100 A with a proper persistent current switch (PCS) operation. The central field given by the Hall probe was 0.21 T, which was the same with that expected by a numerical calculation. The time constant of the current decay during the persistent current mode was evaluated at the coil temperature of 36 and 41 K to be 306 and 228 h, respectively. These values are consistent with the estimation based on the measured joint resistances and they are much longer than that of the previous floating coil of Mini-RT wound 10 years ago (41 h before aged deterioration). By the test results, it has been confirmed that the promising performance of the manufactured REBCO floating coil has been achieved to further promote the Mini-RT project.</abstract><cop>New York, NY</cop><pub>IEEE</pub><doi>10.1109/TASC.2013.2287706</doi><tpages>4</tpages></addata></record>
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source IEEE Electronic Library (IEL)
subjects Applied sciences
Circuit properties
Coiling
Coils
Connection and protection apparatus
Current measurement
Decay
Deterioration
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical resistance measurement
Electromagnets
Electronic circuits
Electronics
Exact sciences and technology
Heating
High-temperature superconductors
HTS coil
Joints
magnetic levitation
Mathematical analysis
mini-RT
persistent current switch
REBCO
Superconducting tapes
Superconductivity
Switches
Switching, multiplexing, switched capacity circuits
Temperature measurement
Upgrading
Various equipment and components
title Experimental Results of the HTS Floating Coil Using REBCO Tapes for the Mini-RT Upgrading
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