Pashupati Dhakal, Gianluigi Ciovati, Peter Kneisel, Ganapati Rao Myneni
The thermal conductivity, DC magnetization and penetration depth of
large-grain niobium hollow cylindrical rods fabricated from ingots,
manufactured by CBMM subjected to chemical and heat treatment were measured.
The results confirm the influence of chemical and heat-treatment processes on
the superconducting properties, with no significant dependence on the impurity
concentrations in the original ingots. Furthermore, RF properties, such as the
surface resistance and quench field of the niobium rods were measured using a
TE011 cavity. The hollow niobium rod is the center conductor of this cavity,
converting it to a coaxial cavity. The quench field is limited by the critical
heat flux through the rods' cooling channel.
View original:
http://arxiv.org/abs/1202.0811
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