DocumentCode :
91876
Title :
AC Loss of 
Butt Joint for JT-60SA Central Solenoid
Author :
Nakamura, Kentaro ; Kawahara, Yuki ; Takao, Tomoaki ; Yagai, T. ; Murakami, H. ; Yoshida, Kenta ; Obana, T. ; Takahata, K.
Author_Institution :
Fac. of Sci. & Technol., Sophia Univ., Tokyo, Japan
Volume :
23
Issue :
3
fYear :
2013
fDate :
Jun-13
Firstpage :
4200304
Lastpage :
4200304
Abstract :
The upgrading project of the JT-60 to the JT-60 Super Advanced (JT-60SA) at Japan Atomic Energy Agency has started as a joint effort between Japan and the EU. The coils of the JT60-SA are separately fabricated in Japan and EU. The CS and EF coils are fabricated in Japan. In this paper, we describe the butt joint of the JT-60SA CS and measured the ac loss under a time-varying external magnetic field, and analyzed the ac loss at the butt joint by using the FEM simulation software COMSOL Multiphysics. As a result, the measured ac loss of the butt joint were found to be the smallest of all joints (the CS butt joint, the EF pancake joint, the terminal EF joint and the EF prototype joint), and to strongly depend on the thickness of the copper sleeve in full-size coil joint.
Keywords :
conductors (electric); copper; electric conduits; finite element analysis; niobium compounds; solenoids; superconducting coils; superconducting magnets; AC loss; COMSOL Multiphysics; CS coils; Cu; EF coils; EF pancake joint; EF prototype joint; EU; FEM simulation software; JT-60 super advanced; JT-60SA CS; JT-60SA central solenoid; Japan Atomic Energy Agency; Nb3Sn; ac loss; butt joint; time-varying external magnetic field; Coils; Conductivity; Conductors; Copper; Joints; Loss measurement; Magnetic fields; $hbox{Nb}_{3}hbox{Sn}$
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2012.2233839
Filename :
6380548
Link To Document :
