cms radioactive source driver systems status and action items paul debbins university of iowa...
TRANSCRIPT
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CMS Radioactive Source Driver SystemsStatus and Action Items
Paul Debbins
University of Iowa
October 14, 2005
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Table of Contents
• Status of Electric Drivers– Modifications Implemented
– Delivery Schedules
– Ongoing Work
• Evaluation/Recommendations for Air Drivers– HE type– HB type
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Electric Diver – Modifications Implemented
• Source Wire Reel and Wire Support system– Source Wire Reel. Reel is mounted on captive roller bearings. Provides stable
low-friction operation of reel. Allows monitoring of drive motor current to serve as a useful diagnostic tool of system health. Reel manufactured of MDS Nylon for low friction and excellent abrasion resistance.
– Lower Support Wire/Spring fingers. Provide even support underneath source wire. Eliminate escape holes in reel base plate. Isolate source wire from seam between reel and reel base plate.
– This set of modifications work together to prevent the most serious form of driver failure: source wire ejection and destruction. Testing so far is promising, but more is needed, particularly regarding wear of the lower support wire.
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Electric Diver – Modifications Implemented
• General Mechanical Modifications
– A variety of mechanical improvements were implemented to enhance the overall long-term reliability of the units. Some examples are:
• Elimination of unnecessary mechanical linkages and adjustment points
• Spring Centering mechanism on reel end-stop mechanism
• Guard plates for sensitive mechanisms
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Electric Driver Delivery
• 2 Modified Drivers delivered to CERN; Icarus01, Icarus02– Icarus01 currently sourcing HE-
– Icarus02 currently sourcing HB+
• 2 more drivers to ship Nov.1; Icarus03, Icarus04– Icarus03 to be used in HF fingerprinting
– Icarus04 as spare on site
• More Drivers are in shipment to Iowa to receive modifications
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Electric Drivers – Ongoing Work
• HE/HB/HF fingerprinting in Fall 2005 constitutes an extensive ‘on site’ testing phase of the modified drivers.
• After fingerprinting drivers should be torn down and evaluated.– Identify wear and establish normal service interval and procedures
– Identify any further mechanical refinements needed
• Continue to develop support infrastructure– Spare parts, tools, documentation
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HE type Air Driver
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Air Drivers - General
• Air drivers are quite different from electric drivers
• Some Electric Driver improvements directly extend to Air devices– Reel System, adaptations for non-magnetic bearing and vert. clearance
– Lower support wire and spring finger system
• Pneumatic Drive, Indexer, and mechanical layout are very different– There are immediately apparent improvements
• Replace plastic air lines with copper and more permanent connectors
• Mount loose components solidly
• Tie down wiring
• Reel end stop centering system
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Air Drivers - General
• Other refinements will require more experience with the driver
– Air Drivers have very different operational behaviors.• Air motor torque/speed
• Pecking behavior
• How to monitor reel/wire friction and forces?
– Long Term testing needed to flush out potential problems
• Long term testing in Magnetic Field
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• Deliver one HE and one HB type driver for Magnet Test– Time only to implement core improvements
• Reel/Support Wire system
• Secure loose components
• Stronger pneumatic system
– HE driver delivered to CERN Dec 5,2005
– HB driver to CERN no later than Feb. 1, 2006
• Exercise Drivers in B field
• Continue to study driver behaviors with units in workshop
• After Mag. Test incorporate additional refinements
Air Drivers – Action Plans
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Air Drivers - Misc
• Iowa Currently has 1 HE driver– 3 more in shipment to Iowa, sufficient for current needs
• 2 HB drivers are needed at Iowa– 1 outfitted for mag. Test
– 2 remains at Iowa for testing
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