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SSS GA calculated on MQ magnetic axis and consequences on beam lines

MO/MQS/MQT. MS/MSS. MCBH/MCBV. SSS GA calculated on MQ magnetic axis and consequences on beam lines. MQ. In industry  SSS assembly is based on inertia tube system (alignment of magnets following their magnetic axis) : BPM support flanges are aligned and welded from this system.

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SSS GA calculated on MQ magnetic axis and consequences on beam lines

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  1. MO/MQS/MQT MS/MSS MCBH/MCBV SSS GA calculated on MQ magnetic axis and consequences on beam lines MQ In industry  SSS assembly is based on inertia tube system (alignment of magnets following their magnetic axis) : BPM support flanges are aligned and welded from this system. At CERN  mechanical measurement of cold bore tubes are performed and the GA is calculated from this measurement. BPM support and flanges are expressed in this system. Magnetic measurements are also done and also put in this system. Idea  Recalculate the GA from magnetic measurement of the MQ and then expressed BPM support and flanges in this new system which should be closer of the one used in industry. Jerome Beauquis

  2. Comparison of the whole population (160 SSS measured mechanically and magnetically) The most important difference between the two GA computation in average is 0.04 mm  non significant. Jerome Beauquis

  3. Difference of the positions of beam lines extremities between the two GA computation For the different movements, we are close of a Gaussian distribution with a mean close of 0 and sigma about 0.1mm  In most of the case, displacement is low. Jerome Beauquis

  4. Non Conformities Due to the difference of measurement system between industry and CERN? BPM support : ten NC’s disappear Flanges : stable Conclusion : there is not a systematic improvement of beam lines extremities positions due to the GA calculation. In some cases there is a real gain. Jerome Beauquis

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