Magnet cryogenic system update.

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Presentation transcript:

Magnet cryogenic system update. Yury Ivanyushenkov, RAL

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

Flexible transfer lines available at CERN Flow in Flow return

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

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.

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

Cryogenic system cost estimate (Preliminary and not official !) Item Supplier Cost Quantity Total cost, k£ Fill transfer line AS Scientific, UK £200 /m 40 8 Vent line AS Scientific Valves Industry £5000 7 35 Cold box AS Scientific ? £10000 1 10 Additional lines £100 /m 4 LN2 Dewar CERN 2 Equipment installation CERN + RAL £200 / day 20 Instrumentation Industry + MIT+ CERN + RAL 5 Control system Industry + MIT + CERN + RAL Total: 86 Contingency (30 %) 26 Total + Contingency 112