Draft of cryogenics

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CLAS12 Torus

• Draft of cryogenics

E.Yu.Klimenko RRC Kurchatov Institute Moscow
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• The main features

• A Thermosyphon mode is used for torus cooling.
• It provides Self-stabilization, saves LHe,
• simplifies Current Leads cooling.
• A two vessel feeder used for this mode
  realization.
• It provides a possibility to refill the upper
  vessel not disturbing LHe circulation provided
  with the lower one.
• A specific powerful cryocooler is used for shield
  cooling down to 40 K.
• It provides an acceptable level of a heat leak to
  the torus (5W).

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The winding operation mode

Feeder
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The Shield operating mode
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• Winding Precooling Heating