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Unit 20 Field models versus measurements

Unit 20: Field models versus measurements 20.2. QUESTIONS. What is our capability of forecasting the field harmonics ?We compare field model to magnetic measurementsin absolute (built magnet vs model)in relative (impact of design variations)How can we steer the systematic components ?With wh

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Unit 20 Field models versus measurements

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    1. Unit 20 Field models versus measurements Soren Prestemon and Paolo Ferracin Lawrence Berkeley National Laboratory (LBNL) Ezio Todesco European Organization for Nuclear Research (CERN)

    2. Unit 20: Field models versus measurements – 20.2 QUESTIONS What is our capability of forecasting the field harmonics ? We compare field model to magnetic measurements in absolute (built magnet vs model) in relative (impact of design variations) How can we steer the systematic components ? With what precision can we forecast the random components ? What is our capability of forecasting beam dynamics parameters based on measurements ?

    3. Unit 20: Field models versus measurements – 20.3 CONTENTS 1 – Systematic components: model vs measurements (absolute) in the example of the LHC dipoles 2 – Systematic components: model vs measurements (relative), and how to perform corrections 3 – How to estimate random component: models vs measurements 4 – A glimpse on beam behavior vs measured field quality

    4. Unit 20: Field models versus measurements – 20.4 1 – SYSTEMATIC COMPONENT, ABSOLUTE: THE CASE OF THE LHC DIPOLE Special features of the LHC dipole Two layers ? large coil deformations Thick stainless steel collars (iron gives only 20% of stress) ? small collar deformations Two-in-one collars ? even multipoles b2, b4, … are allowed ones, but we will not discuss them Thin filament and energy swing of 16 ? persistent current component not so large Data relative to 1200 magnets A good statistics … We will follow the sequence of the magnetic measurements To have an idea of the size of the different terms To see what is the agreement between model and measurements

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