ESS CRYOMODULE FOR ELLIPTICAL CAVITIES Medium and high

ESS CRYOMODULE FOR ELLIPTICAL CAVITIES (Medium and high beta) SLHIPP Meeting LOUVAIN APRIL 17/18 th, 2013 IPN ORSAY: F LESEIGNEUR, JP THERMEAU, G OLIVIER Unité mixte de recherche CNRS-IN 2 P 3 Université Paris-Sud 11 91406 Orsay cedex Tél. : +33 1 69 15 73 40 Fax : +33 1 69 15 64 70 http: //ipnweb. in 2 p 3. fr SLHIPP Meeting LOUVAIN April 17/18 th, 2013 1

CONTENTS - Overall layout Main dimensions General design Vacuum vessel Spaceframe Supporting system Coupler/vessel connection Cold/warm transition Assembly principles SLHIPP Meeting LOUVAIN April 17/18 th, 2013 2

OVERALL LAYOUT CONSTITUTION: DN 100 VALVE = 85 MM C/W TRANSITION = 300 MM All the design presented has been done according to a beta 0, 86 (High β, Linac last section) BELLOWS= 182 MM CAVITY = 1317 MM (HIGHβ) SLHIPP Meeting LOUVAIN April 17/18 th, 2013 3

336 Ø 324 MAIN DIMENSIONS (β 0, 86) Cable Trays 1499 341 604. 5 1500 2664 Overall length: 6, 58 m Vacuum vessel diameter: 1, 2 m Tunnel 1581 6584 SLHIPP Meeting LOUVAIN April 17/18 th, 2013 4

GENERAL DESIGN Positioning optical devices 50 K Thermal shield (aluminium) Biphasic He pipe Trap door (CTS access) Vacuum vessel (stainless steel) Cavity Hanging rods Space frame (290 K) Positioning jacks (3 at 120°) Coupler Guide rail and wheel Door knob and RF wave guide SLHIPP Meeting LOUVAIN April 17/18 th, 2013 5

GENERAL VIEW He regulation valve Thermal shield Supporting rods Cold Tuning System He tank & Cavity Connection jumper Flat cover Vacuum valve Coupler Vacuum vessel support Spaceframe Bellows Door knob SLHIPP Meeting LOUVAIN April 17/18 th, 2013 6

VACUUM VESSEL Spaceframe jacks adjustment Optical alignment Length: 6282 mm Internal diameter: 1200 mm Thickness: 10 to 12 mm (to be confirmed) 2 supports 2 flat covers at each extremity Trap doors for Cold Tuning Access (motor removing) Supports Missing: instrumentation nozzles SLHIPP Meeting LOUVAIN April 17/18 th, 2013 7

SPACEFRAME - Hanging of the cavities Hanging of thermal shield Positioned inside the vacuum vessel Rings (Thickness 28 mm) Ø 60 pipes Rod hanging brackets Ring closing (Steel) Ring closing (coupler level) Steel or aluminium Remains at ambient temperature SLHIPP Meeting LOUVAIN April 17/18 th, 2013 8

SPACEFRAME CALCULATIONS DISPLACEMENTS STRESS Steel Rods brackets 5 supports Weight, 3000 N pre-stress per rod and thermal shrinkage effect taken into account for the calculations Total: 8000 N maximum per rod bracket Maximum displacements on the rods brackets : 0, 42 mm (steel) to 0, 99 mm (aluminium) Choice to be done: stainless steel (less deformation) or aluminium (higher thermal conductivity) SLHIPP Meeting LOUVAIN April 17/18 th, 2013 9

SUPPORTING SYSTEM Helium tank Rods Hanging of the cross rods - on 2 half rings (stainless steel or titanium) fastened to the helium tank on one side - On the spaceframe on the other side Magnetic shield Half rings linked to the tank (under the magnetic shield) Clevis pin (rotating joint) Supporting rod (TA 6 V, Diam. 6 mm) SLHIPP Meeting LOUVAIN April 17/18 th, 2013 Half ring (stainless steel or titanium) 10

SUPPORTING RODS AVAILABLE MATERIALS AND CHARACTERISTICS Characteristics G 10 (Normal dir. ) Nitronic 50 TA 6 V Density Young modulus (GPa) Poisson’s ratio Yield strength (MPa) 1. 85 17. 23(4 K)-9. 88(293 K) 0. 136 261. 89 (293 K) 7. 88 200 0. 3 414(290 K)-883(77 K) 4. 43 110 (293 K) 0. 33 1040 (290 K) Heat conductivity 4 -50 K (W/m. K) Heat conductivity 50 -300 K (W/m. K) 0. 1 -0. 238 -0. 608 0. 27 -5. 69 (inox 304) 5. 69 -14. 79 (inox 304) 0. 233 -2. 411 -7. 555 Thermal shrinkage 4 -293 K 0. 0072 0. 003 (inox 304) 0. 0017 Length: 400 mm HEAT LOSSES Material Diameter (mm) Section (mm 2) Loss 4 -50 K (260 mm) (W) Loss for 32 rods (W) Loss 50 -293 K (140 mm) (W) Loss for 32 rods (W) G 10 (Normal dir. ) 6 28. 27 0. 00088 0. 028 0. 01957 0. 626 7 38. 48 0. 0012 0. 038 0. 0266 0. 851 Nitronic 50 (SS 304) 6 28. 27 0. 01476 0. 472 0. 54334 17. 387 7 38. 48 0. 02013 0. 644 0. 73872 23. 639 TA 6 V 3 7. 07 0. 0018 0. 058 0. 06216 1. 989 4 12. 57 0. 0032 0. 103 0. 11043 3. 534 5 19. 63 0. 005 0. 160 0. 1724 5. 517 6 28. 27 0. 00721 0. 231 0. 24787 7. 932 SOLUTION ADOPTED SLHIPP Meeting LOUVAIN April 17/18 th, 2013 11

COUPLER/VESSEL CONNECTION Bellows Cross view Bottom view Axial blocking plates Pirani gauge Cavity Stop rod Pressure compensation Connection “bell” Vacuum vessel The atmospheric pressure effect (over 1 ton) is compensated by a pre-stress ensured by a spring in order to avoid any force on the coupler and the cavity SLHIPP Meeting LOUVAIN April 17/18 th, 2013 12

COLD/WARM TRANSITION Located at each extremity of the cryomodules BELLOWS Cavity Metal: stainless steel Type: corrugated bellows Internal diameter: 105 mm External diameter: 132 mm External vacuum valve Thickness: 0. 3 mm Corrugation length: 6. 3 mm Number of corrugations: 5 Axial spring rate per corrugation: 240 N/mm Axial spring rate for 5 corrugations: 48 N/mm Air 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 SLHIPP Meeting LOUVAIN April 17/18 th, 2013 Specific supporting tools 13

COLD/WARM TRANSITION THERMAL BEHAVIOUR NO ICING OUTSIDE Heat transfer on the 2 K circuit: 0. 91 W Heat transfer on the 50 K circuit: 1. 40 W External radiation replaced by heat flux SLHIPP Meeting LOUVAIN April 17/18 th, 2013 14

ASSEMBLY PRINCIPLES 1/2 Introduction and temporary hanging of thermal shield inside the spaceframe USE OF RAILS SYSTEM (not shown) Multi-layer insulation not shown Introduction of the cavities assembly inside the spaceframe Hanging of the rods to the spaceframe Cross positioning of the cavities Hanging of thermal shield to the rods SLHIPP Meeting LOUVAIN April 17/18 th, 2013 15

ASSEMBLY PRINCIPLES 2/2 Introduction of the spaceframe inside the vacuum vessel (internal rail on the vessel, wheel on the spaceframe) Positioning of the whole assembly inside the vacuum vessel by the mean of jacks Finishing operations: coupler/vessel interface, helium pipes welding, closing of thermal shield … SLHIPP Meeting LOUVAIN April 17/18 th, 2013 16

ESS CRYOMODULE THANK YOU FOR YOUR ATTENTION SLHIPP Meeting LOUVAIN April 17/18 th, 2013 17