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Roman Pot Mechanical Assembly Status Report Today

The pre-series Roman Pot successfully tested with validation of mechanical assembly, vacuum tests up to 10-6mbar, and spectrum analysis of cleaning. Learn about internal alignment, metrology, RF testing, and more. See the progress on motors, mechanisms, electronics, and collaboration efforts.

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Roman Pot Mechanical Assembly Status Report Today

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  1. Roman Pot Status Report Today

  2. Roman Pot pre-series successfully tested • Validation of the mechanical assembly • Vacuum tests done up to 10-6mbar • Spectrum analysis of the cleaning done by VakuumPraha • Internal alignment and metrology • Final RF test

  3. Test of the cleaning done by the company One vertical vacuum chamber tested, no baking

  4. Metrology Scanning of the position of the pots w.r.t. the nominal axis and the BPMs Final motors installed First measure without vacuum Measure under vacuum only when a flange window is available Laser Tracker Reflecting prism

  5. Motors and mechanisms Received from the collimator group three final stepper motors and hree LVDT sensors The final electronics will be soon ordered: resolvers and LVDTs are read via a NI system to enhance the precision, i.e. slightly cost increase. Provisional electronics for Motors and revolvers has been set up for the preseries test Old LEP collimators system, not rad-hard but good enough for the test Capability to control up to 6 axis independently, needed 3 Strategy for the test: start with the LEP collimators motors (1.5 Nm torque) then install the final motors with high torque

  6. TOTEM Assembly hall at blg.182 300 m2 are available for the mechanical assembly of the Roman Pots, the T1 and the T2 telescopes Facilities: 1 crane with 20tons and 2tons Compressed air circuit Water circuit Small mechanical workshop available on kindly request to Saclay group Internet connections (by wire) At present the space is busy with the assembly of 8 the Roman pots Prendere una foto !

  7. BPM Buttons measurement (done by the AB-BI group) Lower capacitance due to an improved design 50% of the production delivered by CERAMTEC

  8. The first 3 pots • They are the very first full pots • Planarity is not so good as the summer prototypes • Potential error source: the assembly and manufacturing procedure

  9. Waiting for the next 24…. 3 pots just in time for the preseries The final manufacturing and assembly procedure has been changed and agreed with the experts The drawings have been modified accordingly and transmitted to the main workshop

  10. Roman Pot Status Report Critical path Today

  11. LHC Tunnel Main design requirements: Coolant C3F8 Expected heat load per single Pot 25 W Design individual dissipation 50 W Total design cooling capacity 1200 W Maximum ΔT between sensors and fluid 10 °C Silicon sensor operation temperature -15 °C Fluid evaporation temperature -30 °C Total design mass flow 40 g/s USC cavern

  12. RP Cooling Plant • Engineering specification approved on EDMS, Document No.778214 • Integration of the cooling pipes in the LHC tunnel are approved and archived in CDD, Drawing No. LHCF35000019 • Installation in tunnel done • Procurement of materials, commitment for 215kCHF: • 2 Km Copper Pipes with connectors ordered and delivered at CERN (26 kCHF) • Installation Contract placed with external company (30 kCHF) • Two oil-free compressors have been ordered from HAUG AG (60 kCHF) • 1 Tank with condenser 400 liters, ordered at ONDA (3 kCHF)

  13. The evaporation method Pressure reduction valve are not common practice for micro-mass flows and are not rad-hard Orifices and injectors have same limitation for the mass flow The best candidates are capillary tubes: Advantages: Simple and robust, low cost, rad hard + Pressure Throttling = Evaporator Technology know-how is well established at CERN for the ATLAS SCT tracker Capillary

  14. Thermo-mechanical prototype Conceptual Design frozen Verification with Finite Elements Procurement started: Delivered: CE7 card, Silicon Dummy, connector feed through, heaters In fabrication: Detector flange, support mechanics, Kapton circuit Detector flange Capillary in vacuum

  15. Thermo-mechanical prototype

  16. Thermo-mechanical prototype Test results are very satisfactory The concept is proven (both the CE7 card and the capillary) Small thermal gradient along the card < 3o Good agreement with finite element analysis Final design and optimization ready at end of January A sizeable successful effort carried over a short time with a lot of enthusiasm, many complicated technology issues THE DREAM TEAM !!! Eric, Luc, Andre, Vic, Vaclav, Michal, Michal, Jihao, Gennaro, Radi, Christian, Ian

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