AE measurement of the LHD helical coils

被引：9
|
作者：
Ishigohka, T [1 ]
Tsuchiya, T
Adachi, Y
Ninomiya, A
Yanagi, N
Seo, K
Sekiguchi, H
Yamada, S
Imagawa, S
Mito, T
机构：
[1] Seikei Univ, Tokyo 1808633, Japan
[2] Natl Inst Fus Sci, Gifu 5095292, Japan
来源：
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2005年 / 15卷 / 02期
关键词：
AE; LHD; monitoring; superconducting coil;
D O I：
10.1109/TASC.2005.849113
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The authors have measured AE signals from the helical coils of the LHD (Large Helical Device) system at NIFS (National Institute of Fusion Science, Gifu, Japan) in order to monitor the state of the superconducting coils. Four AE sensors are attached on the surface of the vessel containing the helical coils, and preamplifiers are installed close to the sensors in the area with a leakage magnetic field of about 0.02 T. The measuring system is remotely controlled by PC's via a LAN system. The AE signals are recorded and analyzed. Their relation with the balance voltage signal of the coil has been investigated. The obtained experimental result shows that (1) the AE signals have been successfully recorded despite the leakage magnetic field on preamplifier, (2) the AE signal shows a good correlation with the balance voltages, (3) the AE signal is observed only when the excitation current is changing, (4) the pattern of the observed AE signal is stable for each excitation pattern.
引用
收藏
页码：1423 / 1426
页数：4
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