Temperature distribution Vertical displacement

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Presentation transcript:

Temperature distribution Vertical displacement (1) (2) Boundary condition Temperature distribution Vertical displacement Magnetic center vertical offset ~0.3mm. (3)

Causes for vertical orbit drift Source Time scale Tunnel drift Magnet alignment Optics change Magnet & structure thermo- expansion. Power supplies drifts / electronic components change Run-to-run (3-4 months) ~1-2mm 1-2mm ~5mm 1mm ~1mm Day-to-day 1day - 0.2-0.3mm Fill-to-fill 1-4 hrs ~0.1mm How to fix Often survey in drifting areas Modeling of the magnets displacement (Clean leaving) Optics modeling Better tunnel temperature control, one save set and constant current operation. Regular PS calibrations. PS calibration after component change.