We present below the magnetic forces measured on D10 with the 15T symmetric split-pair coil magnet 158OXHV26. The two positions considered are those for which the cryomagnet is the nearest to the neutron guide, i.e. for which the magnetic forces are maximum. These take-off angles are 105.7 and 130° for the Cu (200) and pyrolytic graphite monochromators.

With the goniometer of the sample shaft in place, the vertical magnetic forces are very strong essentially because of the presence of the magnetic materials of the X and Y translation tables. The measurements show that with the goniometer mounted, the maximum allowable field is 7T.

When the goniometer and the translation tables are removed, the vertical forces are reduced by a factor 5 but the horizontal force is multiplied by 2 at the same take-off. Below 105.7°, the magnet can be used up to the maximum field but when the maximum take-off angle of 130° is chosen the field must be limited to 14T.