Abstract
The shielding of a DC magnetic field has been demonstrated to becomplete at 4.2 K, at least up to 2 T, inside the 18 mm bore of a thickMgB2 bulk cylinder, 70 mm tall. No hysteresis has been detected along the cycle of thefield application and removal, and no flux jumps have been detected either. TheMgB2 cylinderwas manufactured by the Reactive Mg Liquid Infiltration process, an ‘in situ’ technology able to give verydense MgB2 manufacts. According to the previously measuredJc(B, T) characteristicsof a MgB2 bulk superconductor of the same origin and quality, a critical current density of about30 kA cm − 2 can be assumed at the fields of 2–3 T and at the temperature of 4.2 K of thereported shielding experiment. Accordingly, we estimate that the thickness of theMgB2 cylinder filled by the shielding currents is about 5.75 mm, lower than the present cylinderthickness of 8.77 mm.
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