Abstract
The TOPAZ superconducting solenoid is cooled with forced two phase helium since it is large in size (2.9 m in diameter, 5.1 m in length) and a thin configuration. A cooling pipe, 18 mm in diameter and 150 m in total length, is wound around the superconducting coil. The relation between the helium mass flow rate and pressure drop through the magnet was obtained by a liquid helium pump which has a capacity of 300 1/h. The quality of helium in the cooling pipe was calculated from the mass flow rate and heat input to the solenoid. The pressure drop of the two phase helium flow was estimated for the case of (1) a homogeneous flow model and (2) a separated flow model. Experimental results agreed with the theoretical results of the homogeneous model. Also, the flow pattern in the cooling pipe was estimated as “stratified flow” on the Baker-diagram of helium.
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