๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Flux trapping and magnetization of hollow superconducting cylinders

โœ Scribed by F.J. Eberhardt; A.D. Hibbs; A.M. Campbell

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
269 KB
Volume
28
Category
Article
ISSN
0011-2275

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โœฆ Synopsis

The magnetMzat~on of hollow cyhnders of h=gh T c material and the field trapped mstde them has been measured by integrating the s=gnal from cods outside and ms,de the cyhnders The two cods allow the field trapped m the grams themselves to be separated from the field due to the c~rculatmg currents The trapped field tells us the maximum field that can be expected m a magnet If Jc drops raptdly with field the parameter which will determine the trapped field is not the zero field critical current density but the field at which it ts reduced by half A comparison ~s made of various preparatton methods

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The thermodynamical potential is an important characteristic of the system. We shall obtain the thermodynamical potential in a general case when an external magnetic field H, = const. outside the cylinder is present, and a solenoid with a flux @ ,o,r is introduced into a cavity (here QSO, = nr:H,,,,

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IN some previous papers ~ 3 by this author certain properties of a Nb3Sn hollow cylinder are reported. Additionally, the temperature dependence of the trapped field was investigated as this gives several relations to the Anderson-Kim theory. For conversion of the values to be measured into electrica

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THE author has recorded the decrease of a field trapped in a Nb3Sn hollow cylinder with increasing temperature, and found the trapped field to be approximately proportional to (1 -T/Te). In the range of field strength examined, the relation ~z = J~(H + Bo) was followed approximately; the resulting q