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Definitions: angles related to magnetic field direction

Definitions: angles related to magnetic field direction. Database values update. Updates about ~1 mrad: 1006: ~ 1 mrad GEOREF discrepancy 1007, 1013, 2004: original error in IPT mole data analysis 2003: original error in 15m shaft data analysis 3002: probable measurement error

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Definitions: angles related to magnetic field direction

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  1. Definitions: angles related to magnetic field direction

  2. Database values update • Updates about ~1 mrad: • 1006: ~ 1 mrad GEOREF discrepancy • 1007, 1013, 2004: original error in IPT mole data analysis • 2003: original error in 15m shaft data analysis • 3002: probable measurement error • Updates about 0.1-0.3 mrad: • 1003, 1009, 1010, 1015, 1017, 2008, 3009, 3034, 3044 • (variations in GEOREF, analysis or measurement errors)

  3. Rotational stability of CM inside cryostat RMS average = 0.49 mrad(only 30 magnets for which field direction measurement exists considered here)

  4. Field direction: overall average

  5. Parallelism between apertures

  6. Warm-cold correlation Slope = 1.09  0.08 mrad/mrad Offset = -0.31  0.05 mrad

  7. Rotation of field direction vs. rotation of cryostat Avg field rotation = 1.01∙cryostat_rotation - 0.01 (mrad)

  8. Rotation of end covers vs rotation of cryostat Avg end rotation = 0.99∙cryostat_rotation + 0.03 (mrad)

  9. Mechanical tilt of end plates Alstom -0.14 ± 0.19 mrad Ansaldo 0.02 ± 0.27 mrad Noell 0.38 ± 0.22 mrad All 0.02 ± 0.22 mrad

  10. Conclusions • Average field direction and parallelism error well within specifications • Field rotation correlates well with cryostat tilt and cold mass end tilt • Warm/cold correlation appears to be feasible within the prescribed tolerance. Larger sample needed to establish it more precisely • Measurements suggest small systematic effects, different for each manufacturer, which may need to be investigated • Further measurements should be done for: - 1002, 1022, 3002: low accuracy of magnetic measurement - 1003, 1006, 1008, 2003: large change in GEOREF • ID card values will be updated shortly

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