F LESEIGNEUR / G OLIVIER LUND January 9th, ESS HIGH BETA CRYOMODULE ESS CRYOMODULE STATUS MEETING HIGH BETA CRYOMODULE LUND JANUARY 9TH, 2013 Unité mixte de recherche CNRS-IN2P3 Université Paris-Sud Orsay cedex Tél. : Fax :

F LESEIGNEUR / G OLIVIER LUND January 9th, HIGH BETA CRYOMODULE ITEMS - Overall layout - Bellows and seals - Spaceframe and cryostating - Extremity covers - Cold/warm transition - Supporting system - Coupler/vessel connection - Cryogenic lines - Vacuum vessel

F LESEIGNEUR / G OLIVIER LUND January 9th, OVERALL LAYOUT COMPONENTS: DN100 VALVE = 85 MM C/W T RANSITION = 300 MM B ELLOWS = 150 TO 190 MM C AVITY = 1317 MM COLD VALVES OR NOT ? 4 OR 8 CAVITIES ?

F LESEIGNEUR / G OLIVIER LUND January 9th, LAYOUT SYNTHESIS β 0,86 Total length (mm) Length in the clean room (mm) 8 cavities assembly length (mm) Difference on the entire length of the HB Linac (112 cavities) (m) 4 cavities warm valves cavities warm valves + cold valves cavities warm valves cavities warm valves + cold valves cavities warm valves / cavities warm valves + cold valves / (With bellows 150mm) CRYOMODULES OF 4 CAVITIES WITHOUT COLD VACUUM VALVE

F LESEIGNEUR / G OLIVIER LUND January 9th, BELLOWS AND SEALS SEAL Aluminium seal Hexagonal shape Height 5,6mm (before flattening) Flattening of 0,6mm (2x0,3mm) 1,2mm gap between the 2 flanges BELLOWS Manufacturer WITZENMANN/HYDRA Number of corrugations: 6 Internal diameter 135mm External diameter 174mm Overall length 182mm Corrugation length 13mm Thickness 2x0.3mm Axial stroke per corrugation +/- 3mm Axial stiffness per corrugation 210N/mm Axial stiffness for 6 corrugations 35N/mm Radial stroke per corrugation +/-0.08mm Radial stiffness per corrugation 44500N/mm

F LESEIGNEUR / G OLIVIER LUND January 9th, LENGTH CALCULATIONS β 0,86 The bellows are at rest at 2K, so they are compressed at ambient temperature Due to the atmospheric pressure during the vacuum pumping, the extremity flat covers have a 0.7mm displacement. So, there is a 1.4mm decrease of the overall length Total length at 2K and with vacuum vessel under vacuum: 6,584mm 6583, , ,61

F LESEIGNEUR / G OLIVIER LUND January 9th, SPACEFRAME SNS TYPE SQUARED SHAPE 2 SOLUTIONS DESIGNED SNS TYPE CHOSEN

F LESEIGNEUR / G OLIVIER LUND January 9th, CRYOSTATING Spaceframe Thermal shield assembly Cavities insertion Final cryostating into the vacuum vessel

F LESEIGNEUR / G OLIVIER LUND January 9th, SPACEFRAME CALCULATIONS Steel 4 supports Steel DISPLACEMENTS STRESS New calculations have to be done with updated design

F LESEIGNEUR / G OLIVIER LUND January 9th, EXTREMITY COVERS CHOICE OF A FLAT COVER -Easier access to the valves and the screws -Large volume available inside the vacuum vessel Thickness: 20mm Need of stiffeners to limit the displacements: max. 0,7mm

F LESEIGNEUR / G OLIVIER LUND January 9th, COLD/WARM TRANSITION Weight: 5.8 Kg without the flat cover and the vacuum valve 25.5 Kg with the flat cover and without the vacuum valve 49 Kg with the flat cover and the vacuum valve BELLOWS Manufacturer: WITZENMANN-HYDRA Metal: stainless steel Type: corrugated bellows Internal diameter: 105mm External diameter: 132mm Thickness: 0.3mm Corrugation length: 6.3mm Number of corrugations: 5 Axial spring rate per corrugation: 240N/mm Axial spring rate for 5 corrugations: 48N/mm

F LESEIGNEUR / G OLIVIER LUND January 9th, COLD/WARM TRANSITION Heat transfer on the 2K circuit: 0.91W Heat transfer on the 50K circuit: 1.40W NO ICING OUTSIDE THERMAL BEHAVIOUR

F LESEIGNEUR / G OLIVIER LUND January 9th, SUPPORTING & POSITIONNING Hanging of the cross rods on 2 half rings (stainless steel or titanium) No axial rods DESIGN DONE ACCORDING TO THE MAGNETIC SHIELD CONFIGURATION Adjustment at 290K of the axial position of the cavities by rods fixed at the end of the spaceframe (removed after jamming of the couplers on the vacuum vessel)

F LESEIGNEUR / G OLIVIER LUND January 9th, COUPLER/VESSEL CONNECTION Bellows Cavity Connection “bell” Vacuum vessel Axial blocking plates Pirani gauge Pressure compensation Axial Blocking plates

F LESEIGNEUR / G OLIVIER LUND January 9th, SUPPORTING SYSTEM FIRST DESIGN To be updated according to the magnetic shield design Rods Magnetic shield Half rings linked to the tank (under the magnetic shield)

F LESEIGNEUR / G OLIVIER LUND January 9th, SUPPORTING RODS CharacteristicsG10 (Normal dir.)Nitronic 50TA6V Density Young modulus (GPa)17.23(4K)-9.88(293K) (293K) Poisson’s ratio Yield strength (MPa) (293K)414(290K)-883(77K)1040 (290K) Heat conductivity 4-50K (W/m.K) (inox 304) Heat conductivity K (W/m.K) (inox 304) Thermal shrinkage 4-293K (inox 304) MaterialG10 (Normal dir.)Nitronic 50 (SS304)TA6V Diameter (mm) Section (mm 2 ) Loss 4-50K (260mm) (W) Loss for 32 rods (W) Loss K (140mm) (W) Loss for 32 rods (W) AVAILABLE MATERIALS AND CHARACTERISTICS HEAT LOSSES BEST CHOICE Length: 400mm

F LESEIGNEUR / G OLIVIER LUND January 9th, ATMOSPH. PRESSURE COMPENSATION Bellows 200 x 235 Force 4340N 3 Stacks of 10x2 spring washers Force 3x1200N Flattening 2,5 to 3,6mm Barometric compensation device too complicated and risky (leaks)

F LESEIGNEUR / G OLIVIER LUND January 9th, CRYOGENIC LINES ONGOING DESIGN Biphasic pipe Level gauge Rupture disc Regulation valve

F LESEIGNEUR / G OLIVIER LUND January 9th, VACUUM VESSEL Spaceframe jacks adjustment Optical alignment Length: 6282mm Internal diameter: 1200mm Thickness: 12mm (to be validated) 2 supports (CTS changes mandatory to replace the motor) Cold Tuning Access Supports

F LESEIGNEUR / G OLIVIER LUND January 9th, GENERAL VIEW

F LESEIGNEUR / G OLIVIER LUND January 9th, CROSS SECTIONS MAIN FEATURES 685

F LESEIGNEUR / G OLIVIER LUND January 9th, DESIGN TO BE DONE Cryogenic lines (running) Hanging of the supporting rods Thermal shield and insulation Miscellaneous THANKS AND HAPPY NEW YEAR TACK OCH GOTT NYTT ÅR MERCI ET BONNE ANNEE