Conduction-cooled Bi2Sr2Ca2Cu3Ox (Bi-2223) magnet for magnetic separation

被引:11
作者
Kumakura, H
Ohara, T
Kitaguchi, H
Togano, K
Wada, H
Mukai, H
Ohmatsu, K
Takei, H
机构
[1] Natl Res Inst Met, Tsukuba, Ibaraki 3050047, Japan
[2] Sumitomo Elect Ind Ltd, Konohana Ku, Osaka 5540024, Japan
来源
PHYSICA C | 2001年 / 350卷 / 1-2期
关键词
Bi2Sr2CaCu2Ox; conduction cooling; thermal stability;
D O I
10.1016/S0921-4534(00)01569-0
中图分类号
O59 [应用物理学];
学科分类号
摘要
A prototype of a conduction-coded Bi2Sr2Ca2Cu3Ox (Bi-2223) magnet system for magnetic separation was constructed. The magnet system has a 200 mm room temperature bore and generates fields higher than 1 T in an Il-liter room temperature space. The magnet axis of the system was designed to be horizontal in order to attain effective magnetic separation. The magnet consisted of 42 double-pancake coils. Each double-pancake coil was fabricated by the react and wind method using 61 multifilamentary Bi-2223/Ag composite tapes. Three Bi-2223/Ag tapes, each 66.9 m long, were bundled and wound into a double-pancake coil. A stainless steel tape was also co-wound To reinforce the coil. Eighteen Cu disks were inserted between the pancakes and thermally connected to the cryocooler in order to enhance the conduction cooling. The magnet was cooled down to 13 K using a Gifford-McMahon-type cryocooler, and it was tested at various excitation speeds. In a magnetic separation system, it is important to attain rapid energizing and de-energizing of the magnet in order to obtain high separation efficiency, We cyclically excited the magnet up to 1.7 T at a speed of 1.7 T/min, The temperature gradually increased with the number of excitations; however, the temperature saturated at 35-38 K, and stable operation of the magnet was obtained at these temperatures. This result indicates that the Bi-2223 magnet is promising for magnetic separation. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:76 / 82
页数:7
相关论文
共 6 条
[1]   Performance tests of Bi-2212 pancake coils fabricated by a lamination method [J].
Kumakura, H ;
Kitaguchi, H ;
Togano, K ;
Hasegawa, T ;
Hikichi, Y .
CRYOGENICS, 1998, 38 (02) :163-167
[2]   Performance tests of Bi-2223 pancake magnet [J].
Kumakura, H ;
Kitaguchi, H ;
Togano, K ;
Wada, H ;
Ohkura, K ;
Ueyama, M ;
Hayashi, K ;
Sato, K .
CRYOGENICS, 1998, 38 (06) :639-643
[3]  
KUMAKURA H, 2000, ADV SUPERCOND, V12, P745
[4]   HIGH GRADIENT MAGNETIC SEPARATION [J].
OBERTEUFFER, JA .
IEEE TRANSACTIONS ON MAGNETICS, 1973, MAG9 (03) :303-306
[5]  
SELVAGGI JA, 1988, ADV CRYOGEN ENG, V33, P53
[6]  
UEYAMA M, 1995, ADV SUPERCONDUCTIVIT, V7, P847