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Figure 1: Slow (left) and fast (right) pre-cooling paths illustration for Liquifier B.
The fast pre-cooling transfer efficiencies obtained range from 47-49% which does not allow filling the entire magnet volume using only one full Liquifier. Nevertheless, higher efficiencies of about 54% can be obtained with the fast pre-cool if the Liquifier pressure is reduced to 3.5 PSI at the expense of nearly 2 hours (~8L) where the Liquifier is not producing while reaching the set pressure. With the fast pre-cooling the last part of the transfer line is not pre-cooled (see Figure 1). When the GV02 valve is fully open, the fast pre-cooling takes about 4 minutes and consumes 4L. Although the fast pre-cooling has a lower transfer efficiency the procedure could be performed when the magnet needs to be filled immediately and the slow pre-cool hasn't been done because none of the Liquifiers are near full.
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