Difference between revisions of "Hardware:Magnet"
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| − | | [[ | + | | [[File:magnet_figure_jpg.jpg|thumb|upright|alt=Robed woman, seated, with sword on her lap|Philipp Veit, ''Germania'', 1834–36]] |
| [[File:magnet_with_rf_coil_jpg.jpg|thumb|upright|alt=Robed woman, standing, holding a sword|Philipp Veit, ''Germania'', 1848]] | | [[File:magnet_with_rf_coil_jpg.jpg|thumb|upright|alt=Robed woman, standing, holding a sword|Philipp Veit, ''Germania'', 1848]] | ||
| [[File:magnet_with_rf_coil_jpg.jpg|thumb|upright|alt=Monument of robed woman, standing, holding a crown in one hand and a partly sheathed sword in another|Johannes Schilling, ''Germania'', 1871–83]] | | [[File:magnet_with_rf_coil_jpg.jpg|thumb|upright|alt=Monument of robed woman, standing, holding a crown in one hand and a partly sheathed sword in another|Johannes Schilling, ''Germania'', 1871–83]] | ||
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| − | {{ | + | {{Gallery |
| − | + | |title=Cultural depictions of George Washington | |
| + | |width=160 | ||
| + | |height=170 | ||
| + | |lines=4 | ||
| + | |align=center | ||
| + | |File:magnet_with_rf_coil_jpg.jpg|alt1=Back of statue facing a city building whose facade is Greek columns covered by a huge U.S. flag|The statue of Washington outside [[Federal Hall]] in [[New York City]], looking on [[Wall Street]]. | ||
| + | |File:magnet_with_rf_coil_jpg.jpg|alt2=Profile of stone face jutting out from a mountainside. Three workers clamber over it, each about the height of the face's upper lip.|Construction on the George Washington portrait at [[Mount Rushmore]], c. 1932. | ||
| + | |File:magnet_with_rf_coil_jpg.jpg|alt3=Silver coin with profile of Washington bust. He faces left regally and wears a colonial-style queue in his hair. "UNITED STATES OF AMERICA" is at top, "QUARTER DOLLAR" at bottom, "LIBERTY" at left, and "IN GOD WE TRUST" above "P" at right. Just below the bust is "JF uc" in tiny letters.|Washington is commemorated on the [[Quarter (United States coin)|quarter]]. | ||
| + | |File:magnet_with_rf_coil_jpg.jpg|alt4=Gold coin with bust of Washington facing slightly left of but looking sternly straight at the viewer. "GEORGE WASHINGTON" is above, "1st PRESIDENT 1789–1797" below, and "JFM" in tiny letters at the bust's base.|Washington is also commemorated on some [[dollar coin (United States)|dollar coins]]. | ||
| + | }} | ||
== Second Generation Magnet (MGH) == | == Second Generation Magnet (MGH) == | ||
Revision as of 23:59, 9 March 2015
First Generation Magnet (CAS)
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 (MGH)
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 ordered from Applied Magnets. To see the specific magnetic pucks used click here.
The yoke and pole pieces are made from AISI 1018 steel. The preferred material would have been low carbon AISI 1008 steel but this grade of steel was not readily available in the needed stock sizes.
