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2
Operation
Figure 1
Schematic of E5084 system operation
E5083 - pressure regulation for refrigerated magnets
Refrigerated magnets are cooled electrically by a coldhead
and compressor system. For zero boil- off magnets, the
coldhead used will have sufficient cooling capacity to
recondense helium gas as it boils off, plus additional
capacity designed in for contingency.
The additional cooling capacity of the coldhead causes the
He gas pressure within the helium can to be reduced below
the ambient atmospheric pressure outside. Unless the system
is manufactured completely vacuum tight this presents a risk
of air being drawn into the helium can from outside.
The E5083 pressure regulator maintains a constant positive
pressure in the helium can by controlling the current sent to
a resistive element inside the cryostat. Heat generated by the
resistor is actively regulated so that it balances the excess
cooling power of the refrigerator.
E5080 Series Cryogen Monitor User Guide
11
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