Flow reduction by AC losses for a forced flow superconducting coil with a cable-in-conduit conductor

✍ Scribed by Makoto Sugimoto; Takashi Kato; Takaaki Isono; Kiyoshi Yoshida; Hiroshi Tsuji

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 269 KB
• Volume: 39
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(99)00037-5

✦ Synopsis

The forced flow superconducting coil especially made from a cable-in-conduit conductor (CICC) is applied for large-scale devices such as fusion magnets because it has high mechanical and electrical performance potential. It has merits for application for pulsed operation coils such as fusion magnets and superconducting magnetic energy storage coils because of excellent thermal and hydraulic performance. When there is heat generation in the coil due to the AC losses, the CICC has the advantage of being able to remove heat due to the large wet perimeter.

Inlet flow reduction is caused by the heat generation on the forced flow coil. The inlet flow reduction provides a limit to the stable pulsed operation of the coil. The models are proposed to evaluate the flow reduction by AC losses due to the pulse operation comparison with the experimental data. The models include the viscosity of the supercritical helium and have good agreement with the experimental data. In addition, the stable operation condition of the pulse coil is also discussed. It can predict the stable conditions of the long pulse operations which are required for fusion and superconducting magnetic energy storage coils.