TY - JOUR
T1 - Performance of a cryogen-free 30 T-class hybrid magnet
AU - Watanabe, K.
AU - Nishijima, G.
AU - Awaji, S.
AU - Takahashi, K.
AU - Koyama, K.
AU - Kobayashi, N.
AU - Ishizuka, M.
AU - Itou, T.
AU - Tsurudome, T.
AU - Sakuraba, J.
N1 - Funding Information:
Manuscript received September 18, 2005. This project was supported by the special budget for research equipments from the Ministry of Education, Science and Technology, Japan.
PY - 2006/6
Y1 - 2006/6
N2 - The world's first cryogen-free hybrid magnet, which was developed at the High Field Laboratory for Superconducting Materials in order to realize an easy-operational magnet system with no use of liquid helium and nitrogen, has achieved 22.7 T in a 52 mm room temperature bore. After this success, we started to construct a new cryogen-free 30 T-class hybrid magnet, consisting of an outer wide-bore cryogen-free 11 T superconducting magnet and an inner water-cooled 19 T resistive magnet. Up to now, the NbTi outer section coil and the Nb3Sn inner one of a wide-bore cryogen-free superconducting magnet has generated individual central fields of 5.3 T at 350 A and 5.8 T at 303 A, respectively in a 360 mm room temperature bore. The wide-bore cryogen-free superconducting magnet was energized up to 9.5 T as a total background field. In hybrid magnet mode the system was operated up to an 8.5 T background field form the cryogen-free supercon-ducting magnet, because a cooling problem was encountered with the innermost coil bobbin during ramping the Bitter magnet. As a result, the cryogen-free hybrid magnet generated 27.5 T in a 32 mm room temperature bore.
AB - The world's first cryogen-free hybrid magnet, which was developed at the High Field Laboratory for Superconducting Materials in order to realize an easy-operational magnet system with no use of liquid helium and nitrogen, has achieved 22.7 T in a 52 mm room temperature bore. After this success, we started to construct a new cryogen-free 30 T-class hybrid magnet, consisting of an outer wide-bore cryogen-free 11 T superconducting magnet and an inner water-cooled 19 T resistive magnet. Up to now, the NbTi outer section coil and the Nb3Sn inner one of a wide-bore cryogen-free superconducting magnet has generated individual central fields of 5.3 T at 350 A and 5.8 T at 303 A, respectively in a 360 mm room temperature bore. The wide-bore cryogen-free superconducting magnet was energized up to 9.5 T as a total background field. In hybrid magnet mode the system was operated up to an 8.5 T background field form the cryogen-free supercon-ducting magnet, because a cooling problem was encountered with the innermost coil bobbin during ramping the Bitter magnet. As a result, the cryogen-free hybrid magnet generated 27.5 T in a 32 mm room temperature bore.
KW - Cryogen-free superconducting magnet
KW - High magnetic field
KW - High strength NbSn wire
KW - Hybrid magnet
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U2 - 10.1109/TASC.2006.870787
DO - 10.1109/TASC.2006.870787
M3 - Article
AN - SCOPUS:33746610245
VL - 16
SP - 934
EP - 939
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 2
M1 - 1643000
ER -