Stability measurements of a large Nb/sub 3/Sn. [8-T fields] Page: 4 of 16
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the plenum. Figure 2 shows the'test conductor positioned on one-half of1
the solenoid pair. °A shroud was constructed around those parts of the
conductor not inside the magnet structure for constraint against the
high magnetic forces. Small voids"between the conductor exterior, the
pulse coils, the shroud, and the magnet structure were filled with a low
0 melting wax to spread loads, to provide thermal isolation between
m * ■' c ■
conductor interior and helium bath, and to improve electrical insulation
between pulse coil lends and other apparatus. When fully assembled, the
split solenoid test conductor unit was hung with the paper clip sample
' \ ' ' ". ' ' J - ° "
in a vertical plane, the current lugs being uppermost.
A 20-V, 30-kA SCR power supply provided dc current. Vapor-cooled
leads rated at 20 kA carried current to the conductor. Helium flovl was
supplied by a blowdown system similar to that previously described3’“
but scaled up in capacity.
Heating method for stability testing ;v.
c ^ ■ H
Tests of conductor stability require that a known amount of energy
be deposited into a volume of conductor while it is operating under
otherwise fixed conditions. We monitored conductor voltage to observe
momentary transitions to the normal state and to determine whether the
conductor was able to recover the0 superconducting state after the energy
deposition. The highest energy deposition per unit volume of conductor
from which recovery was just possible is called the stability margin for
the given conditions. The task of injecting heat into an encapsulated
cable is difficult, and the difficulty is compounded by the necessity of
performing the reaction heat treatment after constructing and forming
the test sample.7 For this test we chose an induction heating method
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Miller, J R; Lue, J W; Shen, S S & Dresner, L. Stability measurements of a large Nb/sub 3/Sn. [8-T fields], article, January 1, 1979; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1100774/m1/4/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.