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nTOF11 Hg System Design - Status Update and Design Optimization Discussion

This document provides an update on the design status of the nTOF11 Hg System, presented at a collaboration meeting at Princeton University in April 2005. It discusses the design work since the previous CERN meetings, including changes to the Hg delivery system, target cart design, and baseplate mobility. It also highlights remaining design issues and future work.

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nTOF11 Hg System Design - Status Update and Design Optimization Discussion

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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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