An evaluation of the inlet flow reduction for a cable in conduit conductor by rapid heating

✍ Scribed by Makoto Sugimoto; Takaaki Isono; Norikiyo Koizumi; Gen Nishijima; Kunihiro Matsui; Yoshihiko Nunoya; Yoshikazu Takahashi; Hiroshi Tsuji

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 348 KB
• Volume: 39
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/s0011-2275(99)00129-0

✦ Synopsis

The ¯ow reduction of forced ¯ow superconducting coil with a cable in conduit (CIC) conductor has been studied for AC losses due to pulsed operation. In this paper, the ¯ow reduction by rapid heating is described for forced ¯ow superconducting coil with a CIC conductor.

The phenomenon of ¯ow reduction of the forced ¯ow coil has been applied for coil quench detection and has been developed by Japan Atomic Energy Research Institute (JAERI). It is named the ``¯uid method'' and essential technology for quench detection of large-scale forced ¯ow superconducting coil as fusion magnets and superconducting magnetic energy storage (SMES) coil. In the ¯uid method, the inlet ¯ow reduction is caused by Joule heating on the normal zone of superconducting coil. The ¯uid method has no electric noise in its detection. This is an advantage for pulsed operation in comparison with other electrical quench detection systems.

On the other hand, there are no quantitative considerations between the inlet ¯ow reduction and Joule heating of the coil inside in previous studies. The ¯ow reduction for the quench detection has been determined by the operation experience of forced ¯ow superconducting coil. The purpose of this paper is an estimation of the relation between the inlet ¯ow reduction and Joule heating at coil quench.

First, the inlet ¯ow reduction was obtained by experiment in which the sample has an inductive heater for the quench emulation. Second, the evaluation model was proposed and its model showed good agreement between the inlet ¯ow reduction and heat generation of the coil inside by rapid heating as coil quench.