Preliminary Results of Magnetic Field Analysis for Specific Items in Step IV

Preliminary Results of Magnetic Field Analysis for Specific Items in Step IV

Control Racks Behind Nth Shield Wallmodelled with

Aluminium or Steel frame

Mike Courthold2nd October 2012

Steel racks behind Nth Wall – Field strength on far side of Nth Wall is 0.4T, thus 621G max on rack sides

Steel racks behind Nth Wall – Field strength on far side of Nth Wall is 0.4T, hence effect on rack sides

Steel racks behind Nth Wall – 18G max inside

Steel racks behind Nth Wall – 18G max inside

Steel racks behind Nth Wall – 18G max inside

Aluminium racks behind Nth Wall – Field strength on far side of Nth Wall still 0.4T, but only 5G max on rack sides

Aluminium racks behind Nth Wall – Field strength on far side of Nth Wall is still 0.4T, but now negligible effect on frame

Aluminium racks behind Nth WallField now increased from 18G to 38G max inside

Aluminium racks behind Nth WallField now increased from 18G to 38G max inside

Conclusion

• Changing rack frames from steel to aluminium dramatically reduces the field experienced by the rack frame from 621G to 5G

• But the field experienced by ferrous objects inside the rack has increased, according to this crude model, from 18G to 38G

• The model is as yet to crude to indicate whether the choice of aluminium framed racks would be beneficial, as no attempt has been made to accurately distribute the mass within