Target System Design Update

Information about Target System Design Update

Published on November 7, 2007

Author: Miguel

Source: authorstream.com

Content

MERIT Hg System Design Update:  MERIT Hg System Design Update V.B. Graves P.T. Spampinato T.A. Gabriel MERIT Collaboration Meeting Princeton University Nov 17-18, 2005 Outline – Design Issues:  Outline – Design Issues Design changes since last meeting Syringe piping Sump tank In-situ nozzle replacement Beam window fabrication Optic window materials Hg jet distortion Hg Syringe System at Design Review:  Hg Syringe System at Design Review Baseplate Discharge manifold Relief valve Rectangular sump tank Multiple Hg cylinder ports Latest Syringe System:  Latest Syringe System No baseplate No manifold No relief valve Vent & Hg discharge are same pipe Drain & Hg inlet are same pipe Lugs on cylinders not representative More of the Latest System:  More of the Latest System Circular sump tank Drain at back Ports for Hg fill, Hg extraction, cylinder vent, overpressure, Hg level sensor Will support vacuum operations Sump tank supported by Hg cylinder Hg pressure transducer on supply pipe Effects of Syringe Changes:  Effects of Syringe Changes Real cylinder models not available yet Overall syringe height decreased Length will increase Magnet Model Changes:  Magnet Model Changes In-situ Nozzle Replacement:  In-situ Nozzle Replacement Extend secondary sleeve past end of magnet to expose screws Plenum might be accessible from end, non-plenum more difficult Risk of spilling Hg into secondary sleeve much greater Details of design not initiated Replaceable Nozzle Recommendations:  Replaceable Nozzle Recommendations Magnet end not readily accessible with all utility lines connected Proposed MIT testing Conduct integrated tests with level baseplate until nozzle finalized Changeouts better controlled, less risk of Hg spill if Hg system extracted from magnet Tilt baseplate for final tests Beam Windows:  Beam Windows Currently have a simple, flexible beam window concept Welded attachments provide more usable space for beam (greater tilt capacity) Discussions with ORNL welding expert did not lead to proven welding process Welding may be feasible but require development (and $$) Mechanical attachment possible but at expense of reducing tilt accommodation Resolution needed now to finish design Optic Windows:  Optic Windows Current: fused silica backed by lexan Alternative: Sapphire instead of silica Silica vs. Sapphire:  Silica vs. Sapphire Mechanical properties of sapphire generally exceed those of silica Design tensile strength Silica: 48 MPa Sapphire: 400 MPa Use sapphire without lexan??? Fused Silica Properties Fused Silica GE Hg Jet Distortion:  Hg Jet Distortion Discussions indicating that jet distortion in field is real and potentially serious effect Alternatives Move nozzle closer to high field (changes angle) Decrease nozzle/solenoid angle & put nozzle above beam Would simplify Hg supply & lend itself to non-plenum approach Would not be able to decrease magnet tilt angle without changing nozzle because nozzle would intercept beam Hg System Costs:  Hg System Costs Syringe ~$80K Remaining items Common baseplate Target transporter Target cart Primary / secondary containment Controls hardware ~$5K Integration & testing More accurate fabrication cost estimate to be initiated next week Conclusions:  Conclusions Final design details of Hg system must be decided Tilt angle Nozzle position Beam window fabrication & attachment Fabrication drawings must be completed soon so procurement process can begin Go-forward design approach must be decided now

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