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

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Main Bullet #1 Main Bullet #2 Main Bullet #3

HXMA WIGGLER MAINTENANCE REVIEW

Linda LinJune 2010

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HXMA Wiggler Overview Installed 2004 Started operation January 2005 Has been operated for about 6.5 years

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Maintenance scheduled1. Top cold heads (re-condenser) exchange - once a year2. Bottom cold heads (shield cooler) exchange - depending on

temperature rise3. Compressor - replace absorber after about 18,000 hours of

operation4. Charge helium gas to compressor as needed5. Check and clean water cooling system as needed6. Service cold head valve as needed7. Refill wiggler with liquid helium about every 1.5 month (two

runs).

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Maintenance occurred (2005)Time Maintenance item Reason Scheduled Emergency

repair

2005-10 Replaced two top cold heads.

Replaced compressor ( top right)

Replaced & purged associated flex lines

First maintenance. Oil leak on

compressor (top right)

Yes

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repair


Changed absorbers

Purged flex lines Purged

compressors Changed motor

drive speed from 120 rpm to 90 rpm.

Routine maintenance

Reduce wear

yes

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repair

2007-10 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

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repair


Replaced two absorbers

Purged flex lines Replaced power

module Moved HXMA

wiggler to down stream Position

Routine maintenance

Improve Injection Efficiency

Yes(Schedule changed)

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repair

2008-05 Replaced compressor (bottom right)

Compressor stopped working, used the spare one

yes

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repair


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

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Maintenance occurred (2009*)Time Maintenance item Reason Scheduled Emergency

repair

2009-09 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.

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repair


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

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Summary of replacement:

Items/service Top left Top right Bottom left

Bottom right

Middle (spare)

Cold head 6 6 1 1 0

Compressor 3 2 0 1 2

Transfer lines 3 2 0 0 0

Absorber 2 2 2 2 1

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Observations: Cold heads worn in specific area

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Cold head wear on one side – 2009-09

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Cold head was fine on the other side -2009-09

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Wiggler stands with two top cold heads housing sit in 30 degree angle

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Cold heads are mounted with 30 degree angle to wiggler vertical position

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Observations (Continued): Oil contamination on cold heads, compressors and

transfer lines

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Oil appeared in the surface of the cold head – 2009-09

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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.

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There is no isolation valve between ion pump and wiggler

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We have to plug the heat tapes to prevent leak from frost of rubber gasket

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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.

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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

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Acknowledgements: Xiaofeng, Shen

Terry Johnson

Ning Chen

Mark Besse

Harley Berndt

Larry Wiebe

Alex Sitnikov

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Questions?

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Thank you

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