Reaction Heat Treatment and Epoxy Impregnation of a Large \hbox\hbox CICC Coil for a Series-Connected Hybrid Magnet

Recent activities that were conducted on the Helmholtz Zentrum Berlin Series-Connected Hybrid outsert coil included the reaction heat treatment and vacuum-pressure impregnation. A thermocouple was wound into the windings for diagnostic purposes during processing of the coil. To maintain a reasonable...

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Bibliographic Details
Published inIEEE transactions on applied superconductivity Vol. 24; no. 3; pp. 1 - 5
Main Authors Dixon, Iain R., Adkins, Todd, Ehmler, Hartmut, Marshall, William S., Bird, Mark D.
Format Journal Article
LanguageEnglish
Published IEEE 01.06.2014
Subjects
Cable-in-conduit conductors (CICC)
Coils
hbox{Nb}_{3}\hbox{Sn}
Heat treatment
hybrid magnets
Insulation
Joints
Superconducting magnets
Temperature measurement
Windings
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Summary:Recent activities that were conducted on the Helmholtz Zentrum Berlin Series-Connected Hybrid outsert coil included the reaction heat treatment and vacuum-pressure impregnation. A thermocouple was wound into the windings for diagnostic purposes during processing of the coil. To maintain a reasonable temperature differential across the coil, the ramp rate was limited to approximately 2.7°C/hr. Epoxy impregnation was conducted with an epoxy developed in-house. The epoxy is transferred in vacuum but cured with one atmosphere gage pressure applied. Subsequently, the winding hardware was removed including the stainless steel mandrel through a machining operation. After assembly of voltage breaks and voltage taps, Paschen tests to 4 kV were conducted successfully that qualified the ground insulation. In addition, surge tests to qualified the internal insulation with 3 kV applied across the leads were conducted. Impedance measurements were conducted to confirm the internal insulation integrity.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2013.2287756