Difference between revisions of "Hardware:Magnet"
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== Second Generation Magnet == | == Second Generation Magnet == | ||
A second generation magnet with 0.4T field strength was built at MGH in late 2014. The magnet uses a pair of 6" diameter, 1" thick discs of N45M. [[File:6inch_puck_magnet.png|click here]] | A second generation magnet with 0.4T field strength was built at MGH in late 2014. The magnet uses a pair of 6" diameter, 1" thick discs of N45M. [[File:6inch_puck_magnet.png|click here]] | ||
| + | [[http://www.magnet4less.com/]] | ||
The yoke and pole pieces are made from [[http://www.azom.com/article.aspx?ArticleID=6115/ AISI 1018 steel]]. The preferred material would have been ultra-low carbon [[http://www.rolledmetalproducts.com/stainless-steel-alloy-aisi-1008/ AISI 1008 steel]] but the material was not readily available in the needed stock sizes. | The yoke and pole pieces are made from [[http://www.azom.com/article.aspx?ArticleID=6115/ AISI 1018 steel]]. The preferred material would have been ultra-low carbon [[http://www.rolledmetalproducts.com/stainless-steel-alloy-aisi-1008/ AISI 1008 steel]] but the material was not readily available in the needed stock sizes. | ||
[[File:Optimized tabletop crosssection view.png|300px|thumb|left|Magnet cross section dimensions. Depth is 6.25".]] | [[File:Optimized tabletop crosssection view.png|300px|thumb|left|Magnet cross section dimensions. Depth is 6.25".]] | ||
Revision as of 22:36, 9 March 2015
The B0 field is created by a small 0.19T permanent magnet weighing about 13kg. The two N45M (NdFeB) rare-earth magnet disks are 15cm in diameter and held 4cm apart with an iron yoke, which also provides a flux-return path for the magnetic field, containing the field to the gap between the pole pieces (and inside the iron). The magnet was designed and constructed by the group of Prof. Yang Wenhui of the Institute of Electrical Engineering of the Chinese Academy of Sciences in Beijing. Design and construction was supervised by Wang Zheng. The CAS group also shimmed the magnet to ~50ppm homogeneity over 1cm DSV. The right photo shows the magnet in the shielded box with the RF coil and 1cm dia. sample tube in place.
Second Generation Magnet
A second generation magnet with 0.4T field strength was built at MGH in late 2014. The magnet uses a pair of 6" diameter, 1" thick discs of N45M. 
[[1]]
The yoke and pole pieces are made from [AISI 1018 steel]. The preferred material would have been ultra-low carbon [AISI 1008 steel] but the material was not readily available in the needed stock sizes.
