1. LHC CRAB CAVITY He Tank DQW Prototype P.Freijedo-Menendez C.Zanoni L.Giordanino R.Leuxe

2. To confirm calculations and to improve mounting and welding process Why a prototype? 2015/07/102/7 Plan Test (welding deformations, pressure, thermal shock…) Other tests in parallel (screw tightening torque, traction and shear tests…)

3. Tests on dummy vessel 3/7 ORDER SEQUENCE TESTSTANDARD or/and PROCEDURE I STATUS OF THE RAW MATERIAL II WELDING TEST ASSEMBLY III DIMENSIONAL CONTROL IV STATUS OF THE HE TANK WELDING V STATUS OF THE HE TANK VI VISUAL INSPECTION 100% WELDS VII DIMENSIONAL CONTROL VIII HELIUM LEAK TEST IX PRESSURE TEST Δp = 2.6 bar T = 300K X HELIUM LEAK TEST XI VISUAL INSPECTION & DIMENSIONAL CONTROL XII THERMAL TEST Procedure : Rate of cool down : TBD Number of cycles : 5 T 0 = 300K T 1 = 80K XIII HELIUM LEAK TEST XIV FINAL DIMENSIONAL CONTROL XV STATUS OF THE TITANIUM PLATES AFTER TESTS XVI DISASSEMBLY, BOLT TORQUE MEASUREMENT, POSSIBLE DESTRUCTIVE TESTS Desired measurements : 1.Strain/Stress on localized positions of the Ti plates 2.Total deformation 3.Change in bolts preload 4.Continuity of contact between covers plates Preload 4500N Fixed support Acceleration 9806.6 mm/s 2 Pressure 0.18 MPa

4. Some differences to final model: Flanges with helicoflex to close ports 2015/07/104/7

5. Some differences to final model: Less parts, less welding 2015/07/105/7 No cavity, less rigidity Blind holes for obtaining a deformation field comparable to the real tank

6. Drawing example Drawing Folder available in EDMS (new node) 2015/07/106/7

7. Thanks for your attention!