Figure 7: (a) For purging the cold-head, the gas inlet from helium gas cylinder (not from helium compressor) should
be connected to supply inlet of the cold-head using appropriate fittings (gas connector). Outlet was kept opened
using gas connector. The fuse and the main power switch to the He-compressor should be kept in the ON position
(b).
Figure 8: (a) After making all connections from the He-tank to the supply line and keeping the return open, and
keeping the pressure around 10 Psi (for few min) and then to about 100 Psi as shown in (b), the cold-head has to be
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