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Cryogenic System Update at CERN: Magnet Cooling System Improvements

This document from Yury Ivanyushenkov at RAL in 2004 provides updates on the liquid nitrogen cooling system for magnets at CERN. It includes diagrams and calculations for flexible transfer lines, fill lines, and cold vent lines, with recommendations for optimal diameters. The document also offers a preliminary cost estimate for the cryogenic system.

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Cryogenic System Update at CERN: Magnet Cooling System Improvements

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  1. CERN P186 Magnet cryogenic system update Yury Ivanyushenkov RAL December 7, 2004

  2. Liquid nitrogen cooling system: Diagram Drawn by Peter Titus Cold vent line Fill line

  3. Flexible transfer lines available at CERN Flow in Flow return

  4. CERN flexible transfer line as a fill line Fill volume = 300 l of LN Geometry: 40 m of horizontal flexible transfer line with 4 bends Conclusion: this line is OK as a fill line if both pipes are in use

  5. CERN flexible transfer line as a cold vent line Geometry: 40 m of horizontal flexible transfer line with 4 bends Note: formula for compressible flow is used Conclusion: this line can not be used as a cold line at high mass flow rate.

  6. Cold vent line diameter calculation Question: what is the optimal diameter for the cold vent line ? Geometry: 40 m of horizontal flexible transfer line with 4 bends Note: formula for compressible flow is used Pressure drop of 1.34 bar for 500 g/s Line int diameter 70 mm

  7. Cryogenic system cost estimate (Preliminary and not official !)

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