CMS Radioactive Source Driver Systems Status and Action Items

1
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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Air Drivers Action Plans

• 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

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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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