ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
A superconducting magnet with a magnetic energy of E = B2/2μo [J/m3] has to overcomea magnetic force of P = B2/2μo [Pa] in the same expression. This means that a high-field 20 Tsuperconducting magnet produces an electromagnetic force of 160 MPa. In order to stand such a largeforce, Nb3Sn superconducting wires are usually reinforced by the hard-copper housing as an externalreinforcement method or the stainless steel winding as a mechanical backup of an outermost Nb3Sncoil. If we focus on a compact superconducting magnet like a cryocooled superconducting magnet, ahigh-strength superconducting wire with a small diameter size of 1- 2 mm is required. The High-FieldLaboratory for Superconducting Materials, IMR, Tohoku University has developed Nb3Sn wiresinternally reinforced with CuNb or CuNbTi composite. These high-strength Nb3Sn wires weresuccessfully employed to construct the unique compact cryocooled 28 T hybrid magnet and thecryocooled 18 T high-temperature superconducting magnet. In addition, we found that the prebendingeffect for high-strength Nb3Sn wires outstandingly improves the Tc, Bc2 and Ic properties. As a nextstep, we intend to develop new Nb3Sn strand cables with the strong mechanical property of 500 MPa,applying the prebending effect for a future 22 T-φ400 mm room temperature bore superconductingmagnet of a 50 T-class hybrid magnet
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1841.pdf
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