Development work for the Japanese LCT coil and its design and construction

Heat transfer from a chemically oxidized or anodized copper plate to liquid helium

“…For example, during the development of helical coils of the Large Helical Device (LHD) at the National Institute for Fusion Science (NIFS), Japan, and the Large Coil Task (LCT) at Japan Atomic Energy Research Institute, the surfaces of the magnets for LHD or LCT were treated by roughening or oxidization to improve the heat transfer performance [3][4][5]. Because the experimental results indicated the heat transfer in the liquid helium for a wide oxidized copper plate was significantly improved, the roughing technology for the LCT and the oxidized surface for LHD were then successfully used during the superconducting coil fabrication process, respectively [6,7]. Iwamoto and his co-workers noted in papers [8,9] the samples were prepared by chemical oxidization.…”

Development of new cryogenic steels for the superconducting magnets of the fusion experimental reactor.

“…Task (LCT), an international program conducted under the auspices of the International Energy Agency (IEA), started to explore the problem of design and construction of superconducting coils for tokamak fusion reactors in 1980. 1,2) Nitrogen-strengthened austenitic stainless steels were used to improve the strength of the structural materials of the LCT coils. For example, 304LN containing 0.150/0 N was used in the Japanese LCT coil.…”

Development and Experiment of LCT Superconducting Toroidal Coil

“…1) which had been designed and tested in single in japan by JAERI. Later US-GD, Swiss, Euratom, US-GE and US-WH coils were delivered one by one with interval of several months.…”