Speaker
Claudio Kotnig
(Graz University of Technology (AT))
Description
The possible operation of the FCC-hh cold mass cooling system with supercritical helium at a temperature of 4 K – 4.5 K is currently under investigation at CERN. The completely different thermodynamic and flow-mechanical properties of supercritical helium compared to pressurized superfluid helium at 1.8 K used in the LHC requires a cryogenic system based on a different concept for cooling the superconducting material. In several particle accelerators cold mass cooling systems working with supercritical helium are realized and serve as a basis for the development of a possible refrigeration scheme for the FCC-hh at a cold mass temperature of about 4 K. Dependent on the final magnet design and the possible installation of piping and auxiliary equipment for cryogenic applications in the cryostat, a probate cooling scheme to extract the heat load of 1.5 W/m reliably can be designed. A basic analysis of different concepts adapted to the specifications of the FCC-hh in advance is important to enable the development of well-matching machinery systems. This poster compares various hydraulic schemes for a cold mass cooling system based on a supercritical helium cycle with respect to the feasibility, the exergetic efficiency and the technical requirements.
Author
Claudio Kotnig
(Graz University of Technology (AT))
