24 September 2012 Immanuel Gfall (HEPHY Vienna) SVD Status of Mechanics PXD-SVD Meeting Göttingen

SVD Status of Mechanics and Cooling Frozen Layout Layout requires fewer ladders which leads to a significant cost reduction Interference free layers 4,5,6 Acceptance is completely covered Ladder assembly and electrical wiring is compatible with this design Immanuel Gfall (HEPHY Vienna)24 September 2012 LayerRadius [mm]Ladder #Windmill °Overlap %

SVD Status of Mechanics and Cooling Layer 3 Immanuel Gfall (HEPHY Vienna)24 September 2012 Position pin Screw Rib contact surface 3 Layer 3 end ring is directly attached to the layer 4 ring

SVD Status of Mechanics and Cooling Ladder 3 Immanuel Gfall (HEPHY Vienna)24 September 2012 Backward bridge: longer than the forward bridge, has a fixed position and heat pipes Forward bridge: Trimmed to fit into the envelope, CTE compensation implemented with slots CFRP Ribs with Airex core 4 Cables are glued and soldered directly onto the hybrid boards

SVD Status of Mechanics and Cooling Bridges Immanuel Gfall (HEPHY Vienna)24 September 2012 Hybrid board connection points Precision hole Screw bore Precision slot Rib slots Cooling contact surface 5 Heat Pipe

SVD Status of Mechanics and Cooling Thermal Simulations Longest bridge: very bad heat conductivity Cooling is applied at the end ring -> heat transfer? Heat pipes are a possible answer Boundary Conditions: –Cold side: -20°C –Heat load: 4.8 W Simulation shows the blocks performance without improvements 6Immanuel Gfall (HEPHY Vienna)24 September °C Al 6061

SVD Status of Mechanics and Cooling Thermal Simulations 2 Cu only Max. temp: 8.2 °C Thermal conductivity: 401 W/ms 7Immanuel Gfall (HEPHY Vienna)24 September 2012 Heat pipes x10 Max. temp: -1.5 °C Thermal conductivity assumed: 4010 W/ms Heat pipes x100 Max. temp: -6.8 °C Thermal conductivity assumed: W/ms

SVD Status of Mechanics and Cooling Optimizations Design/ selection of a suitable heat pipe with 2 mm diameter Cooling surface and block should be milled from one piece Heat pipes should be in direct contact with the cooling surface All the above will be implemented in the FWD cooling block as well 8Immanuel Gfall (HEPHY Vienna)24 September 2012

SVD Status of Mechanics and Cooling Layer 3 Endring Endring is directly attached to the layer 4 endring Connection screw holes need to be arranged asymmetric Support faces contain holes for precision pins and screw holes Cut outs in the inner radius of the ring provide larger service space Endring is designed so the base features can be machined in one step Holes need to be drilled after machining the base features Immanuel Gfall (HEPHY Vienna)24 September 20129

SVD Status of Mechanics and Cooling Layer 3 interference free with layer 4 Immanuel Gfall (HEPHY Vienna)24 September 2012 Outline free of interferences 10

SVD Status of Mechanics and Cooling Ladder Mount: SLM Updates SLM1 is a “Key-Lock” system Poor manufacturing makes this mechanism impractical SLM replacement was designed Immanuel Gfall (HEPHY Vienna)24 September 2012 SLM 11

SVD Status of Mechanics and Cooling SLM2 + 3 Backward mount of SVD needs to be locked and define the Ladders position Due to the Origami stack in this region limits the options for fastener positions to the front face of the endring Operation principle is shown in the drawings below Immanuel Gfall (HEPHY Vienna)24 September Locking screw Position Pin Tapered locking pins Position pin with fastening slot Tapered set screw

SVD Status of Mechanics and Cooling Most Likely Part A variation of SLM3 Single positioning pin with a conical locking bore 13Immanuel Gfall (HEPHY Vienna)24 September 2012 Position pin with positioning hole Precision hole Setscrew hole Cooling channel

SVD Status of Mechanics and Cooling SLM FWD Ladder Option Base on a suggestion from KEK Needs to be investigated if the mechanism is compatible with the Origami Scheme in Layer 6 14Immanuel Gfall (HEPHY Vienna)24 September 2012

SVD Status of Mechanics and Cooling Immediate Outlook Finalizing layer 3 + end ring End ring positioning elements will be added End ring locking mechanism will be included New design study of a hybrid support cone Prototype production of SLM studies Glue radiation hardness test run Assembly of Krakow mockup Finalizing end flange requirement document 15Immanuel Gfall (HEPHY Vienna)24 September 2012

SVD Status of Mechanics and Cooling 16Immanuel Gfall (HEPHY Vienna)24 September 2012 COOLING

SVD Status of Mechanics and Cooling 17Immanuel Gfall (HEPHY Vienna)24 September 2012 Tube fixture Prototype 'big' screw clamp One part clamp Screws Size much material Fragile structure, small contact surface Great force necessary to snap tube into clamp

SVD Status of Mechanics and Cooling 18Immanuel Gfall (HEPHY Vienna)24 September 2012 R=0.8mm Tube fixture Hinge clamp (prototype assembled and tested) Micro water jet cutting fabrication tolerance:0.01mm Max. wall thickness:20mm Min. inner radius:0.1mm PEEK G450

SVD Status of Mechanics and Cooling 19Immanuel Gfall (HEPHY Vienna)24 September 2012 Tube fixture Displacement simulation Necessary displacement UX = -0.4mm Acting force 1.4N

SVD Status of Mechanics and Cooling 20Immanuel Gfall (HEPHY Vienna)24 September 2012 Tube holder assembly Clamp bodies glued at kapton pcb Gap pad at APV’s for an efficient heat transfer (86/125 Keratherm, 0.5mm thickness) Tube clamping

SVD Status of Mechanics and Cooling 21Immanuel Gfall (HEPHY Vienna)24 September 2012 Tube clamp One part clamp under construction Stronger clamp (2 versions with ~3N and ~5N press-in force) Material PEEK R=0.8mm

SVD Status of Mechanics and Cooling 22Immanuel Gfall (HEPHY Vienna)24 September 2012 Tube diameter 1.6mm Hex head wrench size 5mm solder joint 18mm 31mm Miniature tube fitting Stainless steel Consisting of 3 parts Without seal Brazed at tube Screw together without twisting the tube Much smaller than conventional fittings

SVD Status of Mechanics and Cooling 23Immanuel Gfall (HEPHY Vienna)24 September 2012 Pressure Test Successfully pressure tests up to 200 bar –Miniature fitting –Cooling tube with 50µm wall thickness (1.6mm outer diameter)  No expansion in diameter  Small bending of tube visible (compensated by small tube holder clamps) Evaporator Coil Miniature Fitting

SVD Status of Mechanics and Cooling 24Immanuel Gfall (HEPHY Vienna)24 September 2012 Pressure test Tube diameter measurement Pressure [bar] D1 [mm] D2 [mm] D3 [mm] D4 [mm] D5 [mm] 11,591,581,561,611, ,611,58 1,611, ,59 1,571,601,59 D1 D2 D3 D4 D5