- 作者：Sugimoto ; Makoto ; Isono ; Takaaki ; Koizumi ; Norikiyo ; Nishijima ; Gen ; Matsui ; Kunihiro ; Nunoya ; Yoshihiko ; et. al.
- 关键词：Cable-in-conduit conductors (A) ; Supercritical helium (B) ; Forced flow (C) ; Quench (C) ; Flow meters (D)
- 刊名：Cryogenics
- 出版年：1999
- 出版时间：November 1, 1999
- 年：1999
- 卷：39
- 期：11
- 页码：939-945
- 全文大小：348 K
The phenomenon of flow reduction of the forced flow coil has been applied for coil quench detection and has been developed by Japan Atomic Energy Research Institute (JAERI). It is named the “fluid method” and essential technology for quench detection of large-scale forced flow superconducting coil as fusion magnets and superconducting magnetic energy storage (SMES) coil. In the fluid method, the inlet flow reduction is caused by Joule heating on the normal zone of superconducting coil. The fluid 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 flow reduction and Joule heating of the coil inside in previous studies. The flow reduction for the quench detection has been determined by the operation experience of forced flow superconducting coil. The purpose of this paper is an estimation of the relation between the inlet flow reduction and Joule heating at coil quench.
First, the inlet flow 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 flow reduction and heat generation of the coil inside by rapid heating as coil quench.