Abstract
When the insulation of a superconducting magnet is irradiated, the radiolytic gases will be produced in a condensed form and only mobilised when the magnet is warmed, following irradiation. The extent to which these gases will permeate through the resin or remain trapped within the polymer structure is not yet fully understood. Trapped gases may result in internal stress, cause swelling within the polymer and contribute to a degradation of electrical performance. The quantity of gas which remains trapped within the polymer structure is thought to be a function of the internal pressure, material thickness and the permeability of the various gases that may be formed. The study, detailed in this report, was undertaken to estimate the time scale and extent to which gases, produced and trapped following low temperature irradiation, will be lost by permeation through the insulation when it is warmed to 293 K. This work follows from an earlier report which showed that different amounts of gas were evolved when the same resin was irradiated in different geometric forms.
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