...
We get the best efficiency when the transfers lines from the Liquifier to the magnet are sufficiently cold. There are two main modes (paths) to pre-cool the system: the slow pre-cooling and the fast-pre-cooling as well as a combination of these two modes which allows to reduce the slow pre-cooling time. During the slow pre-cooling we can estimate when the system is cold enough through the behavior of the Tank T temperature. The fast pre-cooling transfers efficiency ar are about 47-49% which does not allow to fill the magnet entirely using just one Liquifier although 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 near 2 hours (~8L) where the Liquifier is not producing while reaching the set pressure.
...