November 2016 Massimo Benettoni on behalf of RICH2 Padova group 1 RICH2 design status 2 Tbar and Cooling Tbar construction prototypes in two pieces received likely made of laminated plates AW6083 vs cast plate ID: 1046193
Download Presentation The PPT/PDF document "LHCb RICH2 Upgrade – Mechanics" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
1. LHCb RICH2 Upgrade – MechanicsNovember 2016Massimo Benettoni, on behalf of RICH2 Padova group1RICH2 design status
2. 2T-bar and CoolingT-bar construction: prototypes in two pieces received, likely made of laminated plates AW6083 vs cast plate => out of planarity up to ~1 mmRequiring careful assembly to optimize streightness (RICH2 bars could be one single piece)Cable tray Dimensions and design depending on services DEBs: thermal coupling for DEBs dissipating componentsServices:From T- bar to gas patch panel without patch panels?Connections on board T-bar:PDM HV patch panelFibers splicersCooling:Two ducts, go and return Drop of pressure compatible wrt available Dp ~ 0.7 barOptimized ECs and DEBs cooling
3. 3Cooling geometryFound deep-drilling feasible as small as 5 mmCalculations of heat exchange and pressure drop, range 5 to 10 mm diam.(flow to get Dt out-in of 5^C => water: ~ 1 l/1’, C6F14 Qe =1 lw/1’ ~ 2.4 l/1’ )Small diameters (<7 mm) are more efficient than 10 mm with 8 mm cyl inserts5 mm diameter pressure drop seems to high wrt overall 0.7 bar available6 mm diameter seems best choice(one duct, 1.4 m long)
4. 4Cooling geometryNo more need of inserts or baffles => simpler productionExpected pressure drop with 6 mm duct diameter < 0.3 bar (ducts only)Expected heat exchange coefficient with 6 mm duct diameter:2.3x wrt 10mm circular duct (1st prototype)1.4x wrt 10mm duct with 8 mm cyl insert (hydraulic diameter ~ 3.6 mm)
5. 5Cooling geometryTest of T-bar with single 10 mm duct: baffles wrt to no bafflesWater, Tin = ~ 21 °C , Tout ~= 26 °C, Q~ 1 l/1’, P~350 WNO BAFFLESAverage bar temp 28.8 °CT min face EC ~ 25 °C T max face EC ~ 28 °CMax bar temperature ~ 31.5 °C BAFFLESAverage bar temp 26.4 °CT min face EC ~ 22.5 °C T max face EC ~ 26.5 °CMax bar temperature ~ 29.5 °C Fine! but Dprex (water) @1 l/m: 0.21-0.27 bar/m => C6F14 likely not acceptable
6. 6PrototypesPrototypes built in 2 pieces:Flange to ECs 12x55 mm platedeep-drilled blade, 15x90 plate, duct diameters: 5, 6, 8, 10 mmPrototypes received on Nov. 4, quick check on granite tablePlanarity of blades from very good (<0.2 mm) to bad (~ 0.8 – 1 mm) under cleaning at LNL, then assembly and measuring4+4 pcs to be returned to company for shipping to CernPrototypes available:2 blades w/o ducts (gift) sent to Trevor @ Imperial2 blades 10 mm duct2 blades 8 mm duct1 blade 6 mm duct1 blade 5 mm duct6 flange plates (facing Ecs)2 additional base plates (gift) sent to Trevor @ Imperial
7. 7T-bar endblocks designCooling circuit sealing vs C6F14 NBR and PUR seem ok...https://detector-cooling.web.cern.ch/detector-cooling/data/Fluoro_Compatibility.htmIncreasing prototype bearing dimensions and pitch to reduce preloadHV-pp preliminary design (Flavio F.)
8. DEBs thermal interfaceUpdated design, proposing e.g. 0.5 mm copper sheets to reach bottom of DCDC
9. PDA: rack, rails, maintenance9Review design of rackmaintenance scenario:move back rackmount rails extensionsextract columnrotate columnBar rotation: cable chains vs bundled servicesServices extralenght to allow rack and column retraction and access without disconnectionServices cross section vs cable chain (~ 10 cm2)