FETS meeting Beam Profile Measurement Tank By P. Savage 13th June 2007

Timescale for delivery of first tank Met with Stainless Metalcraft on 29 th May Need to deliver tank by year end Finalised drawings to manufacturer by September Finalise design by end of July / early August – 6 to 8 weeks There is no margin!

Ion source flange PEEK/PVC isolator Lifting lugs Turbovac 340M Rail system Door chassis Mirror motor cradle 90 0 magnets and faraday cup 6 x Turbovac MAG W830 CF160 vacuum port Toroid KF40 laser port Solenoid The beam profile measurement tank conceptual design CF100 cable port

Looking upstream (1) The 90 0 magnets are mounted on the tunnel closure plate (2) The ALIO mirror motors mount in a cradle (white) that will attach to the door chassis (yellow). The complete door assembly runs on a rail system. (1) (2)

QN: What thickness of stainless steel is sufficient for this vacuum vessel? Model 1: Simple 2D flat plate D:\Pete\FEA\ANSYS\PressureVessel\FETS_First_Tank\Vfn_FlatPlate

Flat plate Dimensions: 900mm x 650mm x 10mm thick Edges fully constrained Pressure of 15PSI on one face Material = 316 stainless steel

Flat plate Dimensions: 900mm x 650mm x 10mm thick Edges fully constrained Pressure of 15PSI on one face Material = 316 stainless steel Max deflection = 2mm Max stress = 167 MPa Max deflection = 2mm Close to being too high! 500MPa is the limit but would like a good safety margin. Check for compliance with CERN’s CODAP code.

Model 2: Half tank D:\Pete\FEA\ANSYS\PressureVessel\FETS_First_Tank\HalfTankNoSupports

Half tank, cut in XY plane Dimensions: 900mm x 650mm x 10mm thick Fully constrained along split plane Pressure of 15PSI on one face Material = 316 stainless steel

Max stress = 136 MPa Bit better! Max deflection has gone up to 2.3mm from 2mm and the stress has fallen indicating that model 1 was over constrained

Model 3: Half tank with supports D:\Pete\FEA\ANSYS\PressureVessel\FETS_First_Tank\HalfTankWithSupports

Flat plate Dimensions: 900mm x 650mm x 10mm thick Edges fully constrained Pressure of 15PSI on one face Material = 316 stainless steel Max deflection = 2mm Half box with support rods to stop bend Dimensions: 900mm x 650mm x 10mm thick Fully constrained along split plane Pressure of 15PSI on one face Material = 316 stainless steel Support rods

Flat plate Dimensions: 900mm x 650mm x 10mm thick Edges fully constrained Pressure of 15PSI on one face Material = 316 stainless steel Max deflection = 2mm Displacement vector sum Deflection = 0.6mm which is a good improvement on the 2.3mm for the half tank with no rods.

Flat plate Dimensions: 900mm x 650mm x 10mm thick Edges fully constrained Pressure of 15PSI on one face Material = 316 stainless steel Max deflection = 2mm Displacement vector sum BUT… Max stress = 259MPa – too high! Need to fillet corners to reduce stress concentration

Model 4: Half tank with no supports and circular cutaway D:\Pete\FEA\ANSYS\PressureVessel\FETS_First_Tank\HalfTankNoSupportsCutaway

Displacement vector sum Fully constrained at split plane and at circular face. Atmospheric pressure on main plate. 10mm wall thickness

Displacement vector sum Maximum stress = 38MPa = nothing! Maximum displacement = 0.09mm BUT, how valid is model?

Conclusions: 10mm thick 316 stainless steel plate is sufficient for this design BUT care must be taken to avoid stress concentrations and large unsupported areas. (Mention mounting of toroid – problem may go away). Support system – need to finalise the rail system that mounts to the support benches. This will determine the total support/rail system height which, with a known beam height of 1650mm from the floor the first tank support structure can be designed. Mounting for ion source and isolator. Ideally we would understand how the ion source attaches to the tank via the isolator. Mounting to solenoid – meeting tomorrow

The latest first tank shown mounted on the support stand. This design shows a smaller main vessel to reflect the confirmed solenoid OD of 353mm.