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Microstation Prototype

Microstation Prototype. Progress Report Jaak Lippmaa Manchester, December 12, 2005. Introduction. Microstation concept proposed for the FP420 in August 2005 Roadmap proposed and approved by the FP420 collaboration We report the development to date To Do List Renewal

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Microstation Prototype

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  1. Microstation Prototype Progress Report Jaak Lippmaa Manchester, December 12, 2005

  2. Introduction • Microstation concept proposed for the FP420 in August 2005 • Roadmap proposed and approved by the FP420 collaboration • We report the development to date • To Do List Renewal • Newcomers to the design team Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  3. Microstation Concept Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  4. Microstation Mechanics Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  5. New Requirements • Several detector planes have to be accommodated • Must have flanged interconnect to beam pipe • Must be bakeable • Should be one sided • Detectors should preferably be in beam vacuum Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  6. Implications • Thorough design review was conducted • Present detector frame design cannot accommodate hybrid mounted detectors or multiple detector planes • Increased thermal load not compatible with the original design • Use of detector hybrids imposes changes in detector mounts and the number of wires needed and amount of power that needs to be fed to the vacuum chamber • Vacuum chamber design has to be changed to accommodate flanges and bigger detectors and rigid mount • Relational co-ordinate system has to replaced by the ”cavern reference system” Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  7. Vacuum Chamber • Original vacuum chamber was designed as a lightweight self sustaining pre-tensioned structure suitable for volume production • Manufacturing just one unit is very costly! Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  8. Detector mounts • Detector mounts could not handle the added strain on the inch-worm motors and frames • Cold fingers are inadequate for added thermal load of several detector planes and readout electronics Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  9. Implications cont’d BACK TO THE DRAWING BOARD Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  10. Where will the protons be? Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  11. Vacuum Chamber cont’d • We redesigned the vacuum chamber • Along traditional vacuum design principles using cylindrical components and flanges • All moving parts can be housed in a rigid secodary vacuum chamber elmiminating air/vacuum boundary at bellows • To accommodate detectors on one side of the beam pipe • Detector movement is facilitated by bellows bridging vacuum/air interface, double bellows for added protection to primary vacuum can be accommodated in this case • Detectors are between the beam pipes – careful with the interpipe space budget ! Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  12. New Concept BASIC IDEA - MICROPOT Beam pipe Heat Exchanger Emergency stop and calibration position UHV bellows Detector array Air Cavity -Can be sealed and pumped for secondary vacuum option • Step-Motor • Stiff contact with detector frame • Operates in air or vacuum UHV cavity Rigid (flanged) coupling to the beam pipe • Detector frame • Acts as cooling conduit • Supports rigid cabling Fiducial Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa Cable UHV feedthrough

  13. New Concept Cont’d Beam Pipe Interface Stepper Motor Vacuum Chamber Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  14. New Concept Cont’d Air Pressure Detector Detector Frame Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  15. New Concept Cont’d Heat Exchanger and Cable Feedthroughs Bellows Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  16. New Concept Cont’d Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  17. Advantages of the updated design • Precision adjustable stepper motors are readily available for air or vacuum operation with 5 micron accuracy • Components for the vacuum chamber are available, relatively small amount of welding is needed • Cooling can be handled by simple ethylene-glycol system or LN • COTS components can be used for most of the design other than the detector frame/hybrid • This should keep the cost down and facilitate cost sharing Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  18. To Do List • Requirements set by the transfer cryostate still unclear • Selection of detectors • Need detector pack dimensions and weight • Need accurate bill of materials for vacuum outgassing study • Need to co-ordinate hybrid design – wiring and power requirements (heat exchange) • Selection of readout electronics • Whose DAQ? • How many wires have to cross air/vacuum interface • Selection of mounting • how many degrees of freedom for the mount • How many degrees of freedom for the detector assembly? Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  19. Project Team Expansion Newcomers • Institute for Solid State Physics, University of Tokyo, Japan • National Institute of Chemical Physics and Biophysics, Estonia • Institute of Physics, Tartu University, Estonia (under negotiations) Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

  20. Thank You ! Manchester 11-13 Dec 2005 Microstation Update Jaak Lippmaa

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