Beam Based Survey and Alignment of Ring Magnets David Rubin Cornell Laboratory for Accelerator-Based Sciences and Education.

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Presentation transcript:

Beam Based Survey and Alignment of Ring Magnets David Rubin Cornell Laboratory for Accelerator-Based Sciences and Education

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.

July 8, 2008 ILCDR08 3 Zero corrector orbit

July 8, 2008 ILCDR08 4 Wave analysis Interaction region

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)

July 8, 2008 ILCDR08 6 Move magnet and remeasure After 300 micron move

July 8, 2008 ILCDR08 7 Change in vertical orbit Orbit difference data: after move ref: before move (data-ref)-model The model is the orbit with a 300 micron offset of Q17E

July 8, 2008 ILCDR08 8 Optimize IR correction We managed to reduce RMS from 0.805mm to.771mm

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