What an operator dealing with the helium refrigerator of a CNS should know. CNS helium refrigerator operators. This educational session takes place within a two and a half-day period (total time is around 18 hours).

• Cryogenic aspects of a CNS (why do CNS need Cryogenics?)
  
• A few general reminders (thermal insulation, vacuum, measurement of cryogenic temperatures…)
  
• The Brayton thermodynamic cycle
  
• Helium compression with oil lubricated screw compressor
  
• The oil management system
  
• The cryogenic expansion turbine
  
• Elements of process control in helium refrigeration
  
• Purification by adsorption
  
• Helium analysis
  
• Operational checks and maintenance

Visit of a CNS helium refrigerator