Title :
Experimental investigations of He II heat transfer through a short section of LHC inner triplet quadrupole heat exchanger
Author :
Darve, Ch. ; Huang, Y. ; Nicol, T.H. ; Peterson, T.J.
Author_Institution :
Fermi Nat. Accel. Lab., Batavia, IL, USA
fDate :
3/1/2001 12:00:00 AM
Abstract :
The LHC inner triplet quadrupoles, cooled by pressurized He II, are subjected to a total heat load of more than 7 W/m at nominal luminosity. The heat absorbed in pressurized He II will be transferred to the saturated, two-phase He II via a corrugated copper pipe. Experimental investigations of He II heat transfer across the corrugated pipe are reported. The test sample of corrugated pipe is filled with pressurized He II and with saturated He II on the outside. The maximum heat flux to the test sample is up to 145 W/m2. The characteristics of the corrugated copper pipes under investigation are the Kapitza resistance, thermal conductivity of the material and the geometry of the pipe. The test results for a series of bath temperatures and surface treatments are included
Keywords :
Kapitza resistance; accelerator magnets; cooling; heat exchangers; heat transfer; liquid helium; storage rings; superconducting magnets; synchrotrons; thermal conductivity; He II heat transfer; Kapitza resistance; LHC inner triplet quadrupole; LHC inner triplet quadrupole heat exchanger; bath temperatures; corrugated copper pipe; corrugated copper pipes; heat absorption; maximum heat flux; nominal luminosity; pressurized He II cooling; saturated two-phase He II; surface treatments; thermal conductivity; Conducting materials; Copper; Geometry; Heat transfer; Helium; Large Hadron Collider; Temperature; Testing; Thermal conductivity; Thermal resistance;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
