Beam Based Survey and Alignment of Ring Magnets
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Beam Based Survey and Alignment of Ring Magnets
David Rubin
Cornell Laboratory for
Accelerator-Based Sciences and Education
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July 8, 2008 ILCDR08 2
Beam based alignment
- Measure zero vertical corrector orbit- Use analysis tools to identify offset quadrupoles and tilted bends and to quantify - Move magnets and repeat.
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July 8, 2008 ILCDR08 3
Zero corrector orbit
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July 8, 2008 ILCDR08 4
Wave analysis
Interaction region
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July 8, 2008 ILCDR08 5
Identify misaligned magnet
“Correct” for misalignment in IR with nearby steerings (1E,1W)
Identify 17E as source of vertical orbit error (y_offset = +300 microns)
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July 8, 2008 ILCDR08 6
Move magnet and remeasure
After 300 micron move
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July 8, 2008 ILCDR08 7
Change in vertical orbit
Orbit difference data: after move ref: before move
(data-ref)-modelThe model is the orbit with a 300 micron offset of Q17E
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July 8, 2008 ILCDR08 8
Optimize IR correction
We managed to reduce RMS from 0.805mm to .771mm
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July 8, 2008 ILCDR08 9
Conclusions
-With wave analysis we can effectively identify “biggest” misalignments
-Combination of wave analysis, fitting, and survey data can identify more subtle errors
-Magnet moves have predictable outcomes
Future plans SVD analysis to identify misaligments? Include dispersion as a constraint (insensitive to BPM offset)
Limited by performance of BPM system so looking forward to upgrade