NDLI: Quench problems of Nb/sub 3/Sn cosine theta high field dipole model magnets

Content Provider	IEEE Xplore Digital Library
Author	Yamada, R. Wake, M.
Copyright Year	2002
Abstract	We have developed and tested several cosine theta high field dipole model magnets for accelerator application, utilizing Nb/sub 3/Sn strands made by MJR method and PIT method. With Rutherford cables made with PIT strand we achieved 10.1 Tesla central field at 2.2 K operation, and 9.5 Tesla at 4.5 K operation. The magnet wound with the MJR cable prematurely quenched at 6.8 Tesla at 4.5 K due to cryo-instability. Typical quench behaviors of these magnets are described for both types of magnets, HFDA-04 of MJR and HFDA-05 of PIT. Their characteristics parameters are compared on d/sub eff/, RRR, thermal conductivity and others, together with other historical Nb/sub 3/Sn magnets. It is suggested a larger RRR value is essential for the stability of the epoxy impregnated high field magnets made with high current density strands. It is shown that a magnet with a larger RRR value has a longer MPZ value and more stable, due to its high thermal conductivity and low resistivity.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1140
Ending Page	1143
Page Count	4
File Size	1000381
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Niobium Thermal conductivity Tin Cables Testing Life estimation Accelerator magnets Wounds Stability Current density RRR MJR PIT quench
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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