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Description
In this paper, we present results, analytical and experimental, of two dimensionally identical 1.5 T NbTi coils with a 2-T peak field, operated in the 4.2-6 K range, one impregnated with paraffin and the other solid nitrogen (SN2). In the paraffin coil, the paraffin prevents conductor motion and the coil operates stably in the temperature range. In the SN2 coil, although not as strong as paraffin, the SN2 provides a sufficient enthalpy, stored within the close-pack hexagonal formation, enabling the coil to operate stably. To further demonstrate beneficial effects of SN2 for magnet stability, one of the coils will also be operated without impregnation, paraffin or SN2, in liquid helium (LHe) at 4.2 K: without mechanical support or enthalpy enhancement, we expect the LHe coil to quench prematurely.
Acknowledgement: Research reported in this publication was supported by the National Institute of Biomedical Imaging and Bioengineering under award number R01EB022062.
