Cryogenic test stand Coupler cooling pressure ESS Cryomodule

Cryogenic test stand Coupler cooling pressure ESS Cryomodule status meeting 2013 January 09 Lund Bertrand RENARD CEA

CRYOMODULE TEST STAND > Existing cold box, Dewar and pumping line (red) > New Dewar, valve box and pumping line in common for ESS (2 K) and Ifmif (4. 5 K) (blue)

CRYOMODULE TEST STAND Dewar Valve Box > 1, 2 m

CRYOMODULE TEST STAND > Cryogenic equipment foreseen LHe Transfer line (instead of SHe) LN 2 Transfer line (instead of 50 K He) Dewar with LHe Ph. S Valve box with LN 2 Ph. S and 2 K heat exchanger VLP Return line Electrical heater for VLP line Control valves and instrumentation > Information required Cryomodule geometry Cryomodule interfaces Choice of 2 K heat exchanger position

COUPLER COOLING PRESSURE > Inlet circuit at 3 bar Inlet valve more simple if circuit can be fed with 3 bars. > Safety rules High pressure He already present inside Cryomodule thermal shields. > Circulation More pressure available is best for He circulation, but regulation valve has to take into account max inlet pressure. No more risk of LHe presence at coupler inlet.

COUPLER COOLING PRESSURE > Pressure safety preliminary calculation Von Mises stress from most unfavorable calculation shows 16 MPa for thin 1 mm external tube, with a yield stress of 200 MPa. z inox 1 mm Pression 3 bars diam 100 mm 1 order of magnitude mechanical margin CEA approves 3 bar for nominal pressure

Merci ! ESS Cryomodule status meeting 2013 January 09 Lund Bertrand RENARD CEA