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E. Métral

ENGINEERING DESIGN REVIEW (EDR) FOR THE TOTEM ROMAN POTS ( Thursday 24 Nov. 2005 ). E. Métral. Charge to the Review Committee (from E. Tsesmelis, TS/LEA) Check that the TOTEM Roman Pots perform according to the intended specifications

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E. Métral

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  1. ENGINEERING DESIGN REVIEW (EDR) FOR THE TOTEM ROMAN POTS (Thursday 24 Nov. 2005) E. Métral • Charge to the Review Committee (from E. Tsesmelis, TS/LEA) • Check that the TOTEM Roman Pots perform according to the intended specifications • Endorse the general scenario for the engineering design, assembly and mounting of the TOTEM Roman Pots • Approve the TOTEM Roman Pot concept to allow detailed engineering drawings and technical specifications to proceed • Check the project organization, safety issues and compatibility with neighboring (machine) systems

  2. AGENDA

  3. The TOTEM Experiment at LHC Forward Physics at Interaction Point 5 • Elastic p-p scattering • Total p-p cross section • Diffractive physics • Absolute luminosity measurement • Needs detection of leading protons with very small scattering angles (few μrad)

  4. ROMAN POT DESIGN (1/13)

  5. ROMAN POT DESIGN (2/13) • The Roman Pot, an historically proven technique for near beam physics: ISR, SPS, TEVATRON, RICH, DESY • A CERN in-house technology: ISR, SPS-UA4, CDF CERN for CDF CERN for SPS (UA4)

  6. ROMAN POT DESIGN (3/13) Constraints/Requirements for TOTEM • Very close to the beam operation (10σ ~ 0.8mm) • Secondary vacuum separation for detectors and cables (no outgassing) • High mechanical reliability of the thin window on the pot • Shielding of RF pick-up on the detector/electronics • High resolution, precision and repeatability of the movements

  7. ROMAN POT DESIGN (4/13) • Roman Pots are in many aspects identical to the LHC collimators • Movable devices in the LHC beam • Almost the same requirements for vacuum and RF • Close to the beam operation ~ 10σ • Same Engineering Team (TS-MME group at CERN) • Same movements (motors, resolvers, positioning detectors, drivers) • Same controls hardware/software through the LHC Control room

  8. ROMAN POT DESIGN (5/13)

  9. ROMAN POT DESIGN (6/13)

  10. ROMAN POT DESIGN (7/13)

  11. ROMAN POT DESIGN (8/13)

  12. ROMAN POT DESIGN (9/13)

  13. ROMAN POT DESIGN (10/13)

  14. ROMAN POT DESIGN (11/13)

  15. ROMAN POT DESIGN (12/13)

  16. ROMAN POT DESIGN (13/13)

  17. RF ISSUES (1/2)

  18. RF ISSUES (2/2) Ferrite

  19. VACUUM ISSUES • Synchrotron radiation is the main gas source (referring to a paper by FZ: There is indeed SR in the outgoing line of the beam as well, due to reflection along the beam pipe)  Bakeout (150o C) mandatory  NEG coating on the RP chamber (requires activation at 200o C)

  20. PLANNING AND INSTALLATION (1/3)

  21. PLANNING AND INSTALLATION (2/3)

  22. The installation procedure PLANNING AND INSTALLATION (3/3)

  23. ATLAS ROMAN POTS AT IR1 (1/3)

  24. ATLAS ROMAN POTS AT IR1 (2/3)

  25. ATLAS ROMAN POTS AT IR1 (3/3)

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