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nTOF11 Hg System Design Status

nTOF11 Hg System Design Status. Van Graves Tony Gabriel, Phil Spampinato Collaboration Meeting – Princeton University 29-30 Apr 2005. Access Restrictions. Prior to CERN trip, assumed component footprint restriction was 1.3m X 3m Measurements indicate additional length available

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nTOF11 Hg System Design Status

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  1. nTOF11 Hg System Design Status Van Graves Tony Gabriel, Phil Spampinato Collaboration Meeting – Princeton University 29-30 Apr 2005

  2. Access Restrictions • Prior to CERN trip, assumed component footprint restriction was 1.3m X 3m • Measurements indicate additional length available • New size restriction 1.3m X 4.4m Princeton Meeting– 29-30 Apr 2005

  3. Experiment Layout TT10 Shield Blocks TT2 Access Floor Step ISR (Control Room Location) nTOF11 TT2A TT2 Princeton Meeting– 29-30 Apr 2005

  4. Baseline Concept Presented at Berkeley Collaboration Meeting • Hg piston pump actuated by dual hydraulic cylinders • Hg capacity for 20sec jet duration (35 liters) • Hg system length required assembly inside TT2A tunnel Princeton Meeting– 29-30 Apr 2005

  5. Design Work Since CERN Meetings • Pistons resized to eliminate in-tunnel assembly of target module • Hg jet duration decreased from 20sec to 12sec • Maximum volume required decreased from 35 liters to 23 liters • Baseplate reconfigured to stay within facility size constraints • Target/solenoid integration details • Hg delivery system size reduction • Target cart design optimization • Magnet base support Princeton Meeting– 29-30 Apr 2005

  6. Hg Delivery System • Reduced length • Changed sump design • Refined cart details Princeton Meeting– 29-30 Apr 2005

  7. Stray Field Effects • Initial discussions with ORNL Fusion Division engineers indicate stray fields will tend to pull iron pistons toward magnetic center • Effects need to be quantified Princeton Meeting– 29-30 Apr 2005

  8. Carrier Baseplate • Transports Hg system inside tunnel • Rollers removed once in position • Rails for Hg system cart wheels • Will have mechanism to lock cart in place Princeton Meeting– 29-30 Apr 2005

  9. Common Baseplate • Same design as carrier baseplate, just longer • Rollers used to grossly align solenoid to beam • Provides lateral movement of solenoid for alignment to beam once rollers removed Princeton Meeting– 29-30 Apr 2005

  10. Baseplate Mobility Issues • Method needed to remove rollers from baseplates • Lift from end or underneath? • CERN/MIT or nTOF11 provide? • How to interface to CERN "turtle" • How accurately can baseplate be aligned to beam using rollers? • Lifting method TBD Princeton Meeting– 29-30 Apr 2005

  11. Target Cart Design • Hg system shipped on cart and carrier Princeton Meeting– 29-30 Apr 2005

  12. Cart Details • High capacity track rollers can withstand vertical & side loads • UHMW sheet provides sliding surface for lateral movement of Hg system using jackbolts • Hg system fixed to top plate, final position locked using nut/bolt Princeton Meeting– 29-30 Apr 2005

  13. Installation Sequence Part 1 (Out-of-beam) Princeton Meeting– 29-30 Apr 2005

  14. Installation Sequence Part 2 (In-beam) • Common baseplate can go in beam line prior to Hg system install if beam attenuator is far enough away • Hg system pulled onto common baseplate using strap winch • Jacking system needed to remove rollers • Blocks under leveling feet to provide adequate elevation Princeton Meeting– 29-30 Apr 2005

  15. Baseplate Still Too Long • Adding sliding plate and leveling jacks under solenoid has pushed baseplate closer to floor Princeton Meeting– 29-30 Apr 2005

  16. Alignment Adjustments • Nominal nozzle position relative to secondary containment will be measured at ORNL • CERN beam locating devices should precisely position system relative to beam • Propose using initial beam shot(s) to refine jet position • Optical diagnostics will show beam/jet interaction location • Cart lock plates have jackscrews to provide fine adjustment of target insertion depth • Lateral adjustment of magnet & Hg system also available Princeton Meeting– 29-30 Apr 2005

  17. Current Design Issues • Length optimization • Baseplate interface with CERN "turtle" • Lifting methods, lift points • Stray field effects on pistons & cylinders • Beam alignment details Princeton Meeting– 29-30 Apr 2005

  18. Remaining Work • Lateral restraints • Winch assembly • Alignment fiducials • Replaceable nozzle • Plenum optimization • Beam window integration Princeton Meeting– 29-30 Apr 2005

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