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Istituto Nazionale di Fisica Nucleare Sezione di Milano

LHCb – UT TRACKER UPGRADE. Istituto Nazionale di Fisica Nucleare Sezione di Milano. UT TRACKER DETECTOR MECHANICAL DESIGN «TILES» BASED CONCEPT PROPOSAL. Summary :. REQUIREMENTS AND MECHANICAL CONSTRAINS DESCRIPTION OF THE TILE CONCEPT ADVANTAGES OF THE PROPOSED SOLUTION

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Istituto Nazionale di Fisica Nucleare Sezione di Milano

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  1. LHCb – UT TRACKER UPGRADE Istituto Nazionale di Fisica Nucleare Sezione di Milano UT TRACKER DETECTOR MECHANICAL DESIGN «TILES» BASED CONCEPT PROPOSAL S. Coelli, M. Monti - INFN MILANO

  2. Summary: • REQUIREMENTS AND MECHANICAL CONSTRAINS • DESCRIPTION OF THE TILE CONCEPT • ADVANTAGES OF THE PROPOSED SOLUTION • MECHANICAL DESIGN OF A BASELINE GEOMETRY • STAVE INTEGRATION PROCEDURE • THERMAL ANALYSIS • RADIATION LENGTH EVALUATION • GOALS FOR FUTURE OPTIMIZATION AND EVOLUTION • STRUCTURAL MECHANICAL ANALYSIS: END OF STAVE KINEMATICS • THERMO-MECHANICAL DEFORMATION INDUCED BY THE COOLING DOWN • PROTOTYPES DESIGN; USE OF SHORT STAVELETS AND SELECTED FULL LENGTH STAVES • MATERIALS PROCUREMENT PLAN • COMPOSITES COMPANY COLLABORATION • THERMAL TEST INFRASTRUCTURE WORK IN PROGRESS S. Coelli, M. Monti - INFN MILANO

  3. REQUIREMENTS AND MECHANICAL CONSTRAINS • Given : • the geometry of the sensors and of the relevantelectroniccircuits, namely the ASICsconnected to the sensor • the UT tracker global geometry and the choice of having a modular verticalelementthatwe call a «stave» S. Coelli, M. Monti - INFN MILANO

  4. REQUIREMENTS AND MECHANICAL CONSTRAINS • Afterdiscussion with M. Citterio, having expertise in thiselectronicfield: • About a realisticgeometry of the signal/power connection flexbus: itappearsthatthese are long objectsmodelizableusing a «rectangular» section, and the typicalwidthissomethingaround 10 mm, muchless wide than the sensor and overallstavelargeness, thatis 97,5 mm • About the necessity to have a kind of self-standing suffientlyrigidsupport for the sensor, duringall the phases from the connection (bonding) to the ASIC etc., passingtrought the test of eachsensorduring a qualificationprocess, to the finalintegration of a stave with all the 7+7 sensor on it • The staveis to be attachedat the end on a global mechanicalsupportproviding the correctkinematics and cooling connection Sketch of a typical sensor and its cables S. Coelli, M. Monti - INFN MILANO

  5. REQUIREMENTS AND MECHANICAL CONSTRAINS • The flexbus are objects to be developed and their real properties will be measured only too late • In general they will be a “mixture” of metallic (Copper or Aluminum) conductor embedded into a insulating matrix (Kapton) • Flexbus conductive Kth properties depends on the final design • Flexbus mechanical properties: final geometry (dimensions), % of the component materials, relevant coefficient of thermal expansion (CTE) and Young modules • all these depend on the final design, and all are needed within a good tolerance to run a simulation • ONLY IF we’ll rely on these flexbus to position the sensor on the stave and moreover if we use them as thermal conductors • High CTE and a not very precise geometry are expected from the flexbus materials (from the point of view of a tracker sensor!) • => that’s why we’re trying to propose a stave having the flexbus not underbneath the sensor but attached laterally and using a somewhat indipendent mechanical support • sensor/flexbus connection areas will be taken in account • the mechanical modularity of the stave could be based on a “TILE” having mounted on it a sensor and its attached hybrid circuit and electronics (ASICS etc) S. Coelli, M. Monti - INFN MILANO

  6. DESCRIPTION OF THE TILE CONCEPT Sketch of a TILE MODULE, the UNIT WITH ONE SENSOR SENSOR • ASICs • HYBRID CFRP «TILE» MECHANICAL SUPPORT Description of the layers that make up a TILE MODULE The redlayers are ALL gluelayers S. Coelli, M. Monti - INFN MILANO

  7. TRACKER DETECTOR LOCAL SUPPORTS MECHANICAL DESIGN PROPOSAL SOLUTION • EXPLOITING: • LATERAL POSITIONING OF SIGNAL / POWER CONNECTION FLEXBUS • (ALTERNATIVE TO GLUING ON TOP/PUT UNDERNEATH THE SENSOR) • USE OF CFRP TILES MODULES TO SUPPORT THE SENSORS AND ITS ELECTRONICS • SEMPLIFICATED INTEGRATION MANAGEMENT (seenextslides) • LONGITUDINAL CFRP STRUCTURAL SUPPORTS (FORMING A SANDWICH PANEL TOGETHER WITH THE GLUED TILES) • HIGH CONDUCTIVE /LOW WEIGHT CARBON FOAM CORE • EVAPORATING CO2 COOLING PIPE(S) EMBEDDED INTO THE CARBON FOAM ..Pleaseseenextslides for more details.. typicalsensorelementmounted on the stave The samegeometryconceptisapplicable for 4, 8 or 16 ASICs S. Coelli, M. Monti - INFN MILANO

  8. MECHANICAL DESIGN OF A BASELINE GEOMETRY CROSS SECTION OF THE STAVE STRUCTURAL ELEMENTS DETAIL LONGITUDINAL CFRP STRUCTURAL SUPPORTS (FORMING A SANDWICH PANEL TOGETHER WITH THE GLUED TILES AND THE CORE IN CARBON FOAM) THE BASELINE DESIGN PROVIDES A COUPLE OF SHAPED LONGERONS => DIMENSIONS AND LAY-UP TO BE OPTIMIZED SPACE TO ALLOCATE THE POWER / SIGNAL FLEXBUS DOT GLUED INTO THE LATERAL SPACE CAN ALSO STICK OUTSIDE IF NEEDED S. Coelli, M. Monti - INFN MILANO

  9. MECHANICAL DESIGN OF A BASELINE GEOMETRY TYPICAL STAVE WITH SIGNAL AND POWER FLEXBUS CABLES PUT ON BOTH THE LEFT AND THE RIGHT SIDES SERVICING ONE HALF STAVE SIGNAL AND POWER FLEXBUS SIGNAL AND POWER FLEXBUS SIGNAL AND POWER FLEXBUS SIGNAL AND POWER FLEXBUS S. Coelli, M. Monti - INFN MILANO

  10. MECHANICAL DESIGN OF A BASELINE GEOMETRY GEOMETRY CONCEPT FOR SIGNAL AND POWER FLEXBUS POSITIONING CONNNECTED TO THE HYBRID BONDING? PRESHAPED FLEX INCLUDING HYBRID CONNECTION? DETAILS TO BE DEFINED SENSOR CONNECTION TO THE ASICs BONDING? (SKETCH) S. Coelli, M. Monti - INFN MILANO

  11. STAVE INTEGRATION PROCEDURE THE GOAL IS TO DESIGN A REALISTIC STAVE INTEGRATION PROCESS TAKING INTO ACCOUNT EVERY STEP THE FOLLOWING IS A BASELINE APPROACH TO BE STEPS OR CHANGED EVERYWHERE NEEDED ASSEMBLING OF A TILE MODULE OPERATION TO BE REPEATED FOR EACH MODULE 4 PLANES X 16 STAVES X 7 MODULE ON EACH SIDE (14 SENSORS) = 896 UNITS GEOMETRICALLY IDENTICAL WITH SENSOR AND ASSOCIATED ELECTRONICS CHANGING ACCORDINGLY TO THE POSITION WHITIN THE TRACKER THE UNIT INCORPORATES A CARBON FIBER REINFORCED PLATE SUPPORT : BASELINE STACKING SEQUENCE (O/90/0), EPOXY MATRIX, VOLUM FIBER ~70% MECHANICAL STABILITY AND THERMAL CONDUCTION ASSURED BY DEDICATED GLUE LAYERS S. Coelli, M. Monti - INFN MILANO

  12. STAVE INTEGRATION PROCEDURE BONNDING AND TESTING OF A TILE MODULE THE SEQUENCE OF PROCESS OPERATIONS NEED TO BE DEFINED IN DETAIL THE UNIT CAN BE MOVED AROUND DURING THE OPERATIONS HAVING SMALL GEOMETRY (approx 10 cm X 15 cm) AND A SELF CONSISTENT MECHANICAL SUPPORT AFTER PASSING THE QUALIFICATION PROCESS EACH UNIT IS READY TO BE INTEGRATED IN A STAVE S. Coelli, M. Monti - INFN MILANO

  13. STAVE INTEGRATION PROCEDURE PREPARATION OF A STAVE UNIT THE CARBON FOAM HALF BOTTOM IS MACHINE WORKED WITH SEMI-CYLINDICAL GROOVES TO EMBED THE COOLING PIPES NOTE THAT THERE ARE SEVERAL PIECES LONGITUDINALLY DUE TO STARTING RAW MATERIAL DIMENSION (30cm long i.e.) CFRP LONGERONS COMPOSITE CURED POSSIBLY IN FULL LENGTH (~1 m) 1 OR 2 STRAIGHT COOLING PIPES (TITANIUM / STAINLESS STEEL / ..) LENGTH (~1,5 m) WITH THE RELEVANT CONNECTION FITTING ALREADY WELDED, PRESSURE TESTED AND QUALIFIED GLUING ALL THE PARTS WITH ACCURACY ON A REFERENCE TOOL REFERRED TO A GRANITE TABLE S. Coelli, M. Monti - INFN MILANO

  14. STAVE INTEGRATION PROCEDURE PREPARATION OF A STAVE UNIT GLUING THE PART WITH ACCURACY USING A REFERENCE TOOL REFERRED TO A GRANITE TABLE THE CARBON FOAM HALF TOP IS MACHINE WORKED WITH SEMI-CYLINDICAL GROOVES TO EMBED THE COOLING PIPES AFTER THE MECHANICAL QUALIFICATION (METROLOGY AND MECHANICAL TEST TO BE DEFINED ) THIS «CORE» SUPPORT IS READY ACCEPT THE TILES MODULES, TO BE GLUED ON IT FLEXBUS CABLES LATERALPOSITIONING S. Coelli, M. Monti - INFN MILANO

  15. STAVE INTEGRATION PROCEDURE THE TILE MODULES ARE GLUED IN THE CORRECT POSITION GLUING THE MODULES WITH ACCURACY USING A REFERENCE TOOL OR A ROBOT REFERRED TO A GRANITE TABLE A STRUCTURAL GLUE LAYER ATTACHES THE COMPOSITE TILES TO THE LONGERONS • A GLUE CONDUCTIVE LAYER UNDERNEATH THE TILE THERMALLY CONNECTS THE MODULE TO THE CARBON FOAM THE FLEXBUS INTEGRATION NEED TO BE STUDIED IN DETAIL: ADDED BEFORE OR AFTER MODULES INTEGRATION? S. Coelli, M. Monti - INFN MILANO

  16. STAVE INTEGRATION PROCEDURE INTEGRATION WITHOUT OR WITH THE FLEXBUS CABLES ALREADY IN POSITION TO BE DEFINED ALL THE TILE MODULES ARE GLUED IN THE CORRECT POSITION COMPLETING THE INTEGRATION ON ONE SIDE OF THE STAVE S. Coelli, M. Monti - INFN MILANO

  17. STAVE INTEGRATION PROCEDURE OVERTURNING THE STAVE UNDER CONSTRUCTION USING A DEDICATED TOOL THE OTHER STAVE FACE IS ACCESSIBLE TO ATTACH THE TILE MODULES BACK FACE TILE MODULE GLUING THE MODULES WITH ACCURACY USING A REFERENCE TOOL OR A ROBOT REFERRED TO A GRANITE TABLE BACK FACE TILE MODULE INTEGRATION ON OTHER SIDE OF THE STAVE ALL THE TILE MODULES ARE GLUED IN THE CORRECT POSITION S. Coelli, M. Monti - INFN MILANO

  18. STAVE INTEGRATION PROCEDURE TOWARD FINAL INSTALLATION AFTER THE INTEGRATION PROCESS THE TILES GLUED ON THE TWO SIDES TO THE LONGERONS MAKE THE STAVE TO BECOME A SANDWICH PANEL THAT HAS A MECHANICAL STABILITY AND RIGIDITY CONNECTION OF THE HYBRID CIRCUITS TO THE POWER/SIGNAL FLEXBUS IF NOT ALREADY PRESENT CAN BE MADE USING A DEDICATE TRANSPORTATION TOOL THE STAVE CAN BE CAREFULLY MOVED TO COMPLETE THE INSTALLATION PROCESS AND QUALIFICATION END OF STAVE PARTS (MACHINED PEEK POLYMER) ARE GLUED TO FIX THE STAVE TO THE TRACKER MECHANICAL SUPPORT, TO BE DEFINED STAVE UNIT FRONT AND BACK VIEWS OF A STAVE WITH ALL THE MODULES ON IT S. Coelli, M. Monti - INFN MILANO

  19. STAVE MECHANICS STRUCTURAL DETAILS • STAVE SECTION SHOWING ONLY THE STRUCTURAL PARTS: • CFRP (0/90/0) LONGERON => TO BE OPTIMIZED • CFRP (0/90/0) TILES => TO BE OPTIMIZED • GLUED TOGETHER • FILLING CORE MATERIAL CARBON FOAM ACTS AS THERMAL CONDUCTOR AND HELPS TO MAINTAIN GEOMETRICAL STABILITY S. Coelli, M. Monti - INFN MILANO

  20. STAVE MECHANICS STRUCTURAL DETAILS • STAVE SECTION SHOWING ONLY THE STRUCTURAL PARTS: • COMPOSITE CFRP (0/90/0) LONGERON => TO BE OPTIMIZED BY F.E.M ANALYSIS • COMPOSITE CFRP (0/90/0) TILES => TO BE OPTIMIZED BY F.E.M ANALYSIS • GLUING PROCESS => TO BE OPTIMIZED USING REAL PROTOTYPES • FILLING CORE MATERIAL CARBON FOAM (NOT SHOWN HERE) ACTS AS THERMAL CONDUCTOR AND HELPS TO MAINTAIN GEOMETRICAL STABILITY => THICKNESS TO BE OPTIMIZED • PIPE NUMBER AND DIMENSIONS (DIAMETER, MATERIAL, THICKNESS) => TO BE OPTIMIZED STRUCTURAL COMPOSITES GLUED CONTACTS S. Coelli, M. Monti - INFN MILANO

  21. STAVE MECHANICS STRUCTURAL DETAILS 3D MODEL EXTRACT SHOWING THE OVERLAP BETWEEN TILE MODULES ON OPPOSITE SIDES THE OVERLAP BETWEEN SENSOR IS 1,4 mm AS REQUIRED TILE DIMENSION IS DICTATED BY THE MODULE ELECTRONICS REQUIREMENTS MINIMIZATION OF MATERIAL IS A GUIDELINE TOGETHER WITH CORRECT THERMAL MANAGEMENT S. Coelli, M. Monti - INFN MILANO

  22. STAVE THERMAL ANALYSIS ANSYS FINITE ELEMENT METHOD ANALYSIS VIEW OF MESHED MODEL CROSS SECTION AND TOP VIEW S. Coelli, M. Monti - INFN MILANO

  23. UTAX plane sketch • Selected the «B» typestaveto start: • Ithassame maximum poweras the centralstave «A» type • Chosen to start a detailed full lenghtstave design avoiding the beam pipe interferenceproblemsin the first phase S. Coelli, M. Monti - INFN MILANO

  24. STAVE THERMAL ANALYSIS THERMAL ANALYSIS IS PERFORMED OVER A REPRESENTATIVE THREE MODULE STAVE SECTION USING THE MAXIMUM THERMALLY LOADED SECTION WHERE THERE ARE 16 ASIC POWER SOURCES IN EACH TILE MODULE S. Coelli, M. Monti - INFN MILANO

  25. STAVE THERMAL ANALYSIS • MESHING DETAIL NOTES • DUE TO SMALL (GLUE) THICKNESS LAYERS • ATTENTION MUST BE PAYD ON THE MODELIZATION • TO OBTAIN MODEL RUNNABLE IN A REASONABLE TIME • CONTACT ELEMENTS ARE ANOTHER PROBLEMATIC ISSUE: • LARGE NUMBER AND NODES LOCATION INSIDE ACTIVE ELEMENTS (UNDER THE ASICs) S. Coelli, M. Monti - INFN MILANO

  26. STAVE THERMAL ANALYSIS BOUNDARY CONDITIONS: ASICs THERMAL POWER (~1,4 W/ASIC) S. Coelli, M. Monti - INFN MILANO

  27. STAVE THERMAL ANALYSIS BOUNDARY CONDITIONS: SENSOR THERMAL POWER (~0,5 W) S. Coelli, M. Monti - INFN MILANO

  28. STAVE THERMAL ANALYSIS BOUNDARY CONDITIONS: PIPE INTERNAL WALL TEMPERATURE FIXED TO 0 °C FOR AN EVALUATION OF THE THERMAL GRADIENTS MATERIAL THERMAL PROPERTIES ARE NON TEMPERATURE DEPENDANT THE SIMULATION OUTCOME CAN BE TRANSLATED TO THE REAL FIGURES SUBCTRACTING THE REAL INNER COOLANT TEMPERATURE FOR EVAPORATING CO2 -25 °C CAN BE USEDA SA A GUIDELINE S. Coelli, M. Monti - INFN MILANO

  29. STAVE THERMAL ANALYSIS SIMULATION CALCULATION RESULT GENERAL BEHAVIOUR IMAGE SHOWING EXTERNAL ASICs TEMPERATURE WITH LOCAL MAXIMUM DT OF 25 °C ITERATIONS ALREADY HAS BEEN DONE MOVING THE PIPES LATERALLY TO REDUCE THE MAX T AND REDUCING THE LATERAL SPACE LEFT TO THE FLEXBUS CABLES ACCORDINGLY TO INDICATION FROM M. CITTERIO THAT IS WORKING ON THIS ITEM S. Coelli, M. Monti - INFN MILANO

  30. STAVE THERMAL ANALYSIS • SIMULATION CALCULATION RESULT • DETAIL OF THE TEMPERATURES IN ASICs REGION AND OVER THE SENSOR • ITERATIONS HAS BEEN DONE ON THE DISTANCE SENSOR-ASIC FROM 0.5 TO 2 mm TO REDUCE A LOCAL T PEAK CAUSED ON THE CORNER OF THE SENSOR BY THE POWER OF EXTERNAL SENSOR • OPTIMIZATION GOALS ARE TO REDUCE ASIC T PEAK AND LEVEL T OVER THE SENSOR • WORK IN PROGRESS MANAGING THERMAL PATHS: • CARBON FOAM COULD LOCALLY EMERGE TROUGHT THE TILE CFRP TO BETTER CONTACT POWER SOURCES, TAKING INTO ACCOUNT THE DESIGN FEASIBILITY I.E. CARBON FOAM MACHINING AND GLUING ON THE FOAM MATERIAL TECHNICAL PROBLEMS => PROTOTYPES DEMONSTRATION NEEDED S. Coelli, M. Monti - INFN MILANO

  31. GENERAL CONSIDERATIONS THE PROPOSED GEOMETRY LOOKS PROMIZING IN SOLVING THE DESIGN PROBLEM COLLABORATION COMMENTS ARE WELCOME TO POINT OUT ANY INADVERTENCE AND PROPOSAL TO BE STUDIED A MATERIAL DATABASE HAS BEEN CREATED CONTAINING ALL THE MATERIALS USED IN THE SIMULATION (SEE FOLLOWING PAGE) MATERIALS TO BE USED IN REAL PROTOTTYPES HAVE TO BE CHARACTERIZED WHEN NEEDED BY DEDICATED MEASUREMENT THIS IMPLIES A MATERIAL PROCUREMENT PLAN TO BE DISCUSSED INTO THE COLLABORATION TO OPTIMAZIZE TIME AND COST CARBON FOAM CAN BE GRAPHITIC OR RCV-BASED MATERIAL AND COMES INTO ROW BLOCKS TO BE MACHINED THE NECESSARY PRELIMINARY STEP IS A DESIGN APPROVAL AFTER SOME OPTIMIZATION TO PRODUCE THE TECHNICAL DRAWINGS FOR TEST PROTOTYPES PRODUCTION S. Coelli, M. Monti - INFN MILANO

  32. GENERAL CONSIDERATIONS THE PROPOSED GEOMETRY LOOKS PROMIZING IN SOLVING THE DESIGN PROBLEM COLLABORATION COMMENTS ARE WELCOME TO POINT OUT ANY INADVERTENCE AND PROPOSAL TO BE STUDIED A MATERIAL DATABASE HAS BEEN CREATED CONTAINING ALL THE MATERIALS USED IN THE SIMULATION (SEE FOLLOWING PAGE) MATERIALS TO BE USED IN REAL PROTOTTYPES HAVE TO BE CHARACTERIZED WHEN NEEDED BY DEDICATED MEASUREMENT THIS IMPLIES A MATERIAL PROCUREMENT PLAN TO BE DISCUSSED INTO THE COLLABORATION TO OPTIMAZIZE TIME AND COST CARBON FOAM CAN BE GRAPHITIC OR RCV-BASED MATERIAL AND COMES INTO ROW BLOCKS TO BE MACHINED THE NECESSARY PRELIMINARY STEP IS A DESIGN APPROVAL AFTER SOME OPTIMIZATION TO PRODUCE THE TECHNICAL DRAWINGS FOR TEST PROTOTYPES PRODUCTION S. Coelli, M. Monti - INFN MILANO

  33. S. Coelli, M. Monti - INFN MILANO

  34. RADIATION LENGTH EVALUATION THE % X/X0 OF THIS BASELINE DESIGN NEEDTO BE REFINED (STAVE THICKNESS I.E.) REDUCTION OF MATERIAL BUDGET IS POSSIBLE BUT SOME MARGIN IS NECESSARY S. Coelli, M. Monti - INFN MILANO

  35. S. Coelli, M. Monti - INFN MILANO

  36. FUTURE WORK GOALS FOR FUTURE OPTIMIZATION AND EVOLUTION PROBLEM OF HIGH VOLTAGE ACROSS CFRP TILE UNDER THE SENSOR NEED TO BE ADRESSED, A SOLUTION IMPLEMENTED IN SIMILAR HEP TRACKERS IS A PARYLENECOATING COMPOSITE PARTS PRODUCTION NEEDS SPECIALIZED COMPANY EXPERTIZE TEST PROTOTYPES CAN BE DESIGNED AD HOC FOR THE TEST SHORT PROTOTYPE STAVELETS CAN BE DESIGNED FOR MECHANICAL PRODUCTION TEST AND THERMAL TEST (NUMBER? => MATERIAL PROC.) FULL LENGTH STAVE PROTOTYPES CAN BE DESIGNED AND USED FOR MECHANICAL TEST, FULLY LOADED THERMAL TEST AND THERMOMECANICAL DEFORMATION MEASUREMENT HYBRID AND FLEXBUS MATERIALS ARE RESONABLE HYPOTESIS TO BE CONFIRMED USE OF COPPER OR ALUMINUM AND THEIR % HAVE BIG IMPACT ON THERMAL PROPERTIES AND RADIATION LENGTH VERY SMALL DIAMETER PIPE PRODUCTION IS MATERIAL DEPENDENT: USE OF TITANIUM OR S.S. IMPACTS THE ACTIVITY, A CHOICE HAS TO BE MADE S. Coelli, M. Monti - INFN MILANO

  37. FUTURE WORK • GOALS FOR FUTURE OPTIMIZATION AND EVOLUTION • F.E.M. ANALYSIS WORK PLAN SHOULD FORESEE: • THERMAL OPTIMIZATION • MECHANICAL ANALYSIS, GRAVITY LOADS AND KINEMATICS OF A FULL LENGTH STAVE ATTACHEMENT: DESIGN OF THE END OF STAVE HAS TO TAKE IN ACCOUNT THERMAL EXPANSION/CONTRACTION AND FIXING TECHNIQUE (PEEK WITH PINS AND SLOTS SUGGESTED) • THERMO-MECHANICAL ANALYSIS OF FULL LENGTH STAVE NEEDED TO OTIMIZE THE SHAPE AND LAY-UP OF THE STRUCTURAL COMPOSITE MATERIALS: GIVEN THE ACCEPTABLE DEFORMATION AND THE COOLING DOWN RANGE THE ITERATION ON THE COMPOSITES WITH ANSYS IS A VERY TIME CONSUMING AND DELICATE PROCESS • PIPING MATERIAL AND DIMENSION HAS AN IMPACT: DRIVING FORCE FOR THE LONGITUDINAL STAVE CONTRACTION AND RELEVANT SENSORS DEFORMATION • DYNAMIC ANALYSIS? NEED TO KNOW THE BOUNDARY CONDITIONS (VIBRATION INPUTS..) • LOADED EPOXY GLUES OR CFRP COMPOSITES R&D => TO IMPROVE THERMAL CONDUCTIVITY, EXPERIENCE MADE IN SIMILAR HEP TRACKER IS USEFUL AND MANDATORY NO TO SPEND TIME WITH WRONG TECHNIQUES, GLUE PROCESS IS A VERY SESIBLE ITEM FOR THE STAVE PRODUCTION S. Coelli, M. Monti - INFN MILANO

  38. FUTURE WORK GOALS FOR FUTURE OPTIMIZATION AND EVOLUTION THERMAL TEST INFRASTRUCTURE: COULD START USING A CHILLER TO TEST COOLING PERFORMANCES OF PROTOTYPES AND TO SET FUTURE MEASUREMENT THERMAL PERFORMANCE DEMONSTRATION IS MANDATORY USING A CO2 PLANT CERN LABORATORY CONTACT: WE’RE COLLABORATING WITH CERN DPT . TO SHARE EXPERIENCES IN THE COMMON EFFORT OF USING CO2 COOLING TECHNOLOGY MECHANICAL METROLOGY UNDER COOLING AND OTHER TEST TO BE CAREFULLY PLANNED NEEDED THE REQUIREMENT IN THE FORM OF FIGURES: NOMINAL, MAXIMUM ACCEPTABLE UNDER SEVERAL SCENARIOS LIKE SWITCHING OFF PART OF THE SENSORS ETC.. => MAYBE USEFUL TO WRITE A REFERENCE DOCUMENT? S. Coelli, M. Monti - INFN MILANO

  39. BACKUP SLIDES S. Coelli, M. Monti - INFN MILANO

  40. Half TRACKER planes are Supposed to movehorizontally opening like in the actualLHCb TT tracker S. Coelli, M. Monti - INFN MILANO

  41. Calculation of the stavethermalpowerto be dissipated with the coolingcircuit • supposing to have a modularity with the 4 UT planesdivided in: • 1 right halfplane • 1 lefthalfplane • To start thinking on the connectivity of the coolingsystemexploiting CO2 evaporationsystem • Proposal: use for each «halfplane» • 1 lowerinletmanifold, distributingliquid CO2 to the staves • 1 uppermanifold, collectinghexaust CO2 (partiallyevaporated) from the staves From the Mechanical requirements document for UT Upgrade Tracker => ASIC power estimate ~ 0.768 W/ASIC Number of ASICs in the «B» stave =28 * 4 = 112 ASICs • Total «B» stavepower ~ 90 W • Total «halfplane» power ~ 500 W «lefthalfplane» «right halfplane» CO2 (~ 50%) X := thermodynamictitle Saturatedliquid = 0% Saturatedvapour =100% CO2 (X = 0) S. Coelli, M. Monti - INFN MILANO

  42. CO2 colingplantpower first estimate The CO2 coolingplantshould be a 2PACL system with coolingcapacity: 4000 Watt@-30°C => Need a specificplant design For comparison Actual LHCb- VELO Cooling capacity: 1500 W@-30°C Simone Coelli, Mauro Monti

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