Fabrication and Test of a 40 T Long-Pulse Magnet Driven by Battery Bank

Author

Yiliang Lv ; Tao Peng ; Guobin Wang ; Tonghai Ding ; Houxiu Xiao ; Yuan Pan ; Liang Li

Author_Institution

State Key Lab. of Adv. Electromagn. Eng. & Technol., Wuhan Nat. High Magn. Field Center, Wuhan, China

Volume

24

Issue

3

fYear

2014

fDate

Jun-14

Firstpage

1

Lastpage

4

Abstract

A 40 T long-pulse magnet has been constructed and tested to 32 T with total pulse width of 1.5 s at the Wuhan National High Magnetic Field Center (WHMFC). The magnet is energized by a battery bank power source consisting of 900 12 V/200 Ah lead-acid battery cells. The magnet consists of a polyhelix inner coil and an outer coil wound with copper foil. We made some improvements by adding axial slots on the helices due to the eddy current electromagnetic force, and each layer of helices is reinforced by Zylon-epoxy composite. The copper foil coil is insulated with polyimide film extending over the sides of the foil. The copper bar electrode is silver brazed on the ends of copper foil and has been proved to be quite feasible. In this paper, the calculated results of the electromagnetic force caused by eddy current will be presented. The magnet manufacture techniques will be described and the magnet test results will be listed and analyzed.

Keywords

brazing; copper; eddy currents; epoxy insulation; foils; lead acid batteries; magnetic forces; polymer films; silver; superconducting coils; superconducting device testing; superconducting magnets; Ag; Cu; Zylon-epoxy composite; axial slots; battery bank power source; brazed silver; copper bar electrode; copper foil coil; eddy current electromagnetic force; helices; lead-acid battery cells; long-pulse magnet; magnetic flux density 32 T; polyhelix inner coil; polyhelix outer coil; polyimide film; pulse width; Batteries; Coils; Copper; Eddy currents; Electromagnetic forces; Magnetic fields; Superconducting magnets; Battery bank power source; copper foil coil; long pulse magnet; polyhelix;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2013.2286095

Filename

6636058