• norsk
    • English
  • English 
    • norsk
    • English
  • Login
View Item 
  •   Home
  • Fakultet for informasjonsteknologi og elektroteknikk (IE)
  • Institutt for elkraftteknikk
  • View Item
  •   Home
  • Fakultet for informasjonsteknologi og elektroteknikk (IE)
  • Institutt for elkraftteknikk
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

AC-tap i MgB2-superleder: Effekt av simulert slaglende

Lindau, Sandra Madeleine
Master thesis
Thumbnail
View/Open
644986_COVER01.pdf (184.0Kb)
644986_FULLTEXT01.pdf (2.271Mb)
URI
http://hdl.handle.net/11250/257486
Date
2013
Metadata
Show full item record
Collections
  • Institutt for elkraftteknikk [1941]
Abstract
Superconductive materials can conduct DC currents without energy losses when cooled down below their critical temperature. However, under AC conditions, energy losses appear in the superconductor. In 2001 the new and inexpensive superconductor MgB2 entered the market. Currently this conductor is used in DC applications such as MRI, but before implementing the use of MgB2 in AC applications more research has to be carried out. The basic questions are how large are the AC losses, in what way do they depend on magnetic field, current and temperature, and can they be reduced to a level acceptable for commercial use?This Master?s thesis is a part of a larger work at NTNU/SINTEF. In earlier projects calorimetric AC loss measurements have been performed on an MgB2 round wire and tape, and there have been performed critical currents on the MgB2 tape.The aim for the Master?s thesis was to find the relationship between the twist pitch and the losses of a multifilamentary wire. Calorimetric AC loss measurements have been performed on seven different lengths, from 3 mm to 50 mm, of the round multifilamentary MgB2 wire. These measurements have been performed by applying AC magnetic fields from 40 mT to 210 mT with a frequency between 15 Hz to 260 Hz at three different temperatures.At 50 Hz, 100 mT and 35 K the AC losses reduces by a factor of 6 by reducing the sample length of 12 mm, 29 mm or 50 mm to 3 mm. From theoretical calculations, it is believed that by reducing the twist pitch of a long sample from 24 mm to 6 mm the benefit from twisting will be at a maximum.
Publisher
Institutt for elkraftteknikk

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit
 

 

Browse

ArchiveCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsDocument TypesJournalsThis CollectionBy Issue DateAuthorsTitlesSubjectsDocument TypesJournals

My Account

Login

Statistics

View Usage Statistics

Contact Us | Send Feedback

Privacy policy
DSpace software copyright © 2002-2019  DuraSpace

Service from  Unit