CMS Radioactive Source Driver SystemsStatus and Action Items

Paul Debbins

University of Iowa

October 14, 2005

Table of Contents

• Status of Electric Drivers– Modifications Implemented

– Delivery Schedules

– Ongoing Work

• Evaluation/Recommendations for Air Drivers– HE type– HB type

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.

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

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

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

HE type Air Driver

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

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

• 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

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