ca Main Bullet #1 Main Bullet #2 Main Bullet #3 HXMA WIGGLER MAINTENANCE REVIEW Linda Lin June 2010

ca HXMA WIGGLER MAINTENANCE REVIEW HXMA Wiggler Overview  Installed 2004  Started operation January 2005  Has been operated for about 6.5 years

ca HXMA WIGGLER MAINTENANCE REVIEW Maintenance scheduled 1.Top cold heads (re-condenser) exchange - once a year 2.Bottom cold heads (shield cooler) exchange - depending on temperature rise 3.Compressor - replace absorber after about 18,000 hours of operation 4.Charge helium gas to compressor as needed 5.Check and clean water cooling system as needed 6.Service cold head valve as needed 7.Refill wiggler with liquid helium about every 1.5 month (two runs).

ca HXMA WIGGLER MAINTENANCE REVIEW Maintenance occurred (2005) TimeMaintenance itemReasonScheduledEmergency repair  Replaced two top cold heads.  Replaced compressor ( top right)  Replaced & purged associated flex lines  First maintenance.  Oil leak on compressor (top right) Yes

ca HXMA WIGGLER MAINTENANCE REVIEW Maintenance occurred (2006) TimeMaintenance itemReasonScheduledEmergency repair  Replaced two top cold heads.  Changed absorbers  Purged flex lines  Purged compressors  Changed motor drive speed from 120 rpm to 90 rpm.  Routine maintenance  Reduce wear yes

ca HXMA WIGGLER MAINTENANCE REVIEW Maintenance occurred (2007) TimeMaintenance itemReasonScheduledEmergency repair  Replaced top right cold head with top mid cold head.  Started to use only four cold heads for HXMA wiggler cooling  Routine maintenance  Reduce annual maintenance cost yes

ca HXMA WIGGLER MAINTENANCE REVIEW Maintenance occurred (2008) TimeMaintenance itemReasonScheduledEmergency repair  Replaced two top cold heads.  Replaced two absorbers  Purged flex lines  Replaced power module  Moved HXMA wiggler to down stream Position  Routine maintenance  Improve Injection Efficiency Yes (Schedule changed)

ca HXMA WIGGLER MAINTENANCE REVIEW Maintenance occurred (2008) TimeMaintenance itemReasonScheduledEmergency repair  Replaced compressor (bottom right)  Compressor stopped working, used the spare one yes

ca HXMA WIGGLER MAINTENANCE REVIEW Maintenance occurred (2009) TimeMaintenance itemReasonScheduledEmergency repair  Replaced two top cold heads.  Replaced two compressors (top)  Replaced flex line (top left)  Purged flex lines  Purged bottom compressors  Routine maintenance  Oil contamination on compressors and flex lines yes

ca HXMA WIGGLER MAINTENANCE REVIEW Maintenance occurred (2009*) TimeMaintenance itemReasonScheduledEmergency repair  Replaced top left cold head  Replaced top left compressor  Replaced flex line  Top left cold head stop working. Tried spare compressor to run, still no good.  Oil contamination in compressor & flex lines yes *Wiggler stopped running in July.

ca HXMA WIGGLER MAINTENANCE REVIEW Maintenance occurred (2010) TimeMaintenance itemReasonScheduledEmergency repair  Replaced two top cold heads.  Replaced compressor (top left)  Replaced three absorbers  Replaced flex line (top left)  Purged all flex lines  Purged bottom compressors  Routine maintenance  Oil contamination on compressor (top left) and associated flex lines yes

ca HXMA WIGGLER MAINTENANCE REVIEW Summary of replacement: Items/serviceTop leftTop rightBottom left Bottom right Middle (spare) Cold head Compressor Transfer lines Absorber 22221

ca HXMA WIGGLER MAINTENANCE REVIEW Observations:  Cold heads worn in specific area

ca HXMA WIGGLER MAINTENANCE REVIEW Cold head wear on one side –

ca HXMA WIGGLER MAINTENANCE REVIEW Cold head wear on one side –

ca HXMA WIGGLER MAINTENANCE REVIEW Cold head was fine on the other side

ca HXMA WIGGLER MAINTENANCE REVIEW Cold head wear on one side –

ca HXMA WIGGLER MAINTENANCE REVIEW Cold head wear on one side –

ca HXMA WIGGLER MAINTENANCE REVIEW Wiggler stands with two top cold heads housing sit in 30 degree angle

ca HXMA WIGGLER MAINTENANCE REVIEW Cold heads are mounted with 30 degree angle to wiggler vertical position

ca HXMA WIGGLER MAINTENANCE REVIEW  Observations (Continued):  Oil contamination on cold heads, compressors and transfer lines

ca HXMA WIGGLER MAINTENANCE REVIEW Oil appeared in the surface of the cold head –

ca HXMA WIGGLER MAINTENANCE REVIEW Observations (continued):  Compressor’s internal settings were configured for automatic re-start.  The top right compressor was only able to be started at 120 rpm – would not start at a lower rpm.  Ion pump is difficult to be changed  Gaskets may become stiff during liquid Helium refill - heat tape used.

ca HXMA WIGGLER MAINTENANCE REVIEW There is no isolation valve between ion pump and wiggler

ca HXMA WIGGLER MAINTENANCE REVIEW We have to plug the heat tapes to prevent leak from frost of rubber gasket

ca HXMA WIGGLER MAINTENANCE REVIEW Conclusion  The wiggler runs at 1.9 Tesla successfully with the annual maintenance/emergency repair and regular refill.  The total times of cold heads’ replacement were met with the schedule in 6.5 years.  Compressors and transfer lines had lot more replacements than we expected.  The 30 degree angle seems to be a problem.  Extra work on heat tape – each refill and maintenance.

ca HXMA WIGGLER MAINTENANCE REVIEW Conclusion (continued):  Average maintenance cost is more than 3 times the maintenance cost of the BMIT Wiggler*  Frequency of maintenance is approximately 3 times that of the BMIT Wiggler*  Liquid Helium consumption is much higher than the BMIT Wiggler* *BMIT Wiggler has seen limited operation

ca HXMA WIGGLER MAINTENANCE REVIEW Acknowledgements: Xiaofeng, Shen Terry Johnson Ning Chen Mark Besse Harley Berndt Larry Wiebe Alex Sitnikov

ca HXMA WIGGLER MAINTENANCE REVIEW Questions?

ca HXMA WIGGLER MAINTENANCE REVIEW Thank you