The MEG Room
The magnetically shielded room is a product of Vacuumschmelze (Hanau, Germany). The shielding effect is provided by two layers of mu metal; the inner layer is 3 mm and the outer layer is 2 mm thick. Predicted shielding performance was rated to be -60 dB at 1 Hz; actual performance exceeds this prediction. The exterior dimensions of the room are 2.9 x 3.5 x 2.9 m, and the inner dimensions are 2.4 x 3.0 x 2.4 m.