Loss Viewer 2 - XAL application

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Loss Viewer 2 - XAL application

• Alexander Zhukov
• SNS

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BLMs at SNS

• How we use BLMs
• Prevent instant loss high power
• Limit activation
• Tune the machine
• Measure residual activation during down time
• Measure intentional loss

Total number gt 360!
BLM system is a crucial part of MPS the last
line of defense against uncontrolled beam loss
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What are operator/physicist requirements?

• Overall bar-plot view of the whole machine
• BLM must be labeled on bar-plot with its name
  (not some number)
• MPS Limits
• Different normalizations (over beam charge,
  limit etc)
• Export losses to a file
• IOC software is hard to change due to formal
  administrative procedures
• History in some form

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LossViewer2 application

• Client side - no IOC modifications
• XAL application shares common LAF with
  other apps
• Standard XAL optics file
• Configurable detector sets (DnD)
• JFreechart for plotting
• Axis dedicated to detector type
• Show/hide button for limits

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Table pane and DragnDrop
Plot pane
Table pane for selection and details
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Dynamic table view
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Normalizations

• Normalizations can be reasonably combined
  (e.g. charge and distance)
• User can select to use rolling average instead
  of signal itself

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Weighed history
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Waterfall plot
Custom widget not Jfreechart
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MPS limits for RTBT
Limit selection startegy
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BLM statistics

• XAL service collects data into ORACLE
• Web application loads it and generates
  report
• Constant time for generating report
  regardless time period covered by report
  less than 15 seconds
• Data available since Jan 2007
• Time resolution one minute
• History plot available as well

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Summary

• LossViewer2 is an XAL application that displays
  losses in different forms
• Good example of using XAL framework
• Currently it is one of the most used applications
  in Control Room
• Satisfies (more or less) both physicists and
  operators