CRYOGUY Education in Cryogenics
INTRODUCTION TO HELIUM REFRIGERATION FOR SUPERCONDUCTING DEVICES
INTRODUCTION TO HELIUM REFRIGERATION FOR SUPERCONDUCTING DEVICES
This session has been set up on demand of CERN’s in order to give an overview of helium refrigeration that is connected to superconducting devices.
Whom for?
Explain to the clients of helium refrigeration plants (persons who design or build or operate superconducting devices), where does the cryogenic power they need come from.
Each participant brings his/her PC loaded with the REFPROP® software. Participants must be familiar with Excel®.
How long?
This educational session takes place within a three-day period (total time is around 21 hours).
PROGRAMME
Theory, cycles
  • Cryogenics and thermodynamics basics for helium and nitrogen
  • Heat exchanger theory
  • Refrigeration and liquefaction
  • Thermodynamical cycles for high power and for temperatures lower than 4.5 K
  • Liquid nitrogen pre-cooling of a liquefier
  • Thermal shield cooling
Technology and operation of the main components
  • Helium compression with oil lubricated screw compressor
  • The oil management system
  • Heat exchanger technology
  • Cryogenic expansion turbines
  • Cryogenic centrifugal compressors
Connection between the superconducting device and the refrigerator
System control
Circuit conditioning, cooling-down and warming-up
Simple thermodynamical calculations (number of attendees limited to 10)
  • Easy use of REFPROP,
  • Fluid expansion with heat input
  • Heat exchanger operating at temperatures > 4.5 K
Visit of a local cryogenic helium plant