Magnetically shielded container

G - Physics – 21 – F

Patent

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Details

G21F 5/00 (2006.01)

Patent

CA 2304786

The invention provides a magnetically shielded container (1) having disposed in parallel opposed position on an axis (S) thereof magnetic field homogenizing pole shoes (10.1, 10.2), having disposed about said pole shoes a magnetically shielded yoke (2), said pole shoes and yoke enclosing a magnetic chamber (26), said container further comprising magnetic field sources (2.4, 2.5) disposed about and radially distanced from said axis whereby there exists within said chamber substantially homogenous magnetic field Bo oriented in the direction of said axis and whereby there is a usable volume within said chamber where the ratio of the magnetic field gradient in the direction transverse to said axis to said magnetic field Bo has a value of no more than 1.5 x 10-3/cm. By virtue of the very low ratio of weight to volume that is achievable with this construction, the containers according to the invention are economical to produce and especially suited to transporting polarized gasses.

L'invention concerne un contenant blindé magnétiquement (1) et présentant des pièces polaires (10.1, 10.2) d'homogénéisation de champ magnétique, disposées de manière parallèle et opposée sur un axe (S) du contenant, une culasse de blindage magnétique (2) étant disposée autour des pièces polaires, lesquelles avec la culasse enferment une chambre magnétique (26). Ce contenant comprend en outre des sources de champ magnétique (2.4, 2.5) placées autour dudit axe, à une certaine distance radiale de celui-ci, ce qui permet d'obtenir dans ladite chambre un champ magnétique (B¿o?) sensiblement homogène et orienté dans le sens dudit axe, et donc un volume utilisable où le rapport entre le gradient du champ magnétique dans le sens transversal audit axe et le champ magnétique (B¿o?) représente une valeur qui ne peut être supérieure à 1,5 x 10?-3¿/cm. Etant donné le très bas rapport poids/volume que l'on peut obtenir avec cet agencement, les contenants selon l'invention sont économiques à produire et spécialement conçus pour transporter des gaz polarisés.

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