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Controlling Magnets at Jefferson Laboratory

Controlling Magnets at Jefferson Laboratory. The Magnet Record. Provides two dependent settable fields for controlling magnet’s effect Magnet current (“S”) Magnet field (“BDL”) Magnet hysteresis loop control Magnet field map kept in each record. Magnet Hysteresis. Managing Hysteresis.

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Controlling Magnets at Jefferson Laboratory

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  1. Controlling Magnets at Jefferson Laboratory

  2. The Magnet Record • Provides two dependent settable fields for controlling magnet’s effect • Magnet current (“S”) • Magnet field (“BDL”) • Magnet hysteresis loop control • Magnet field map kept in each record

  3. Magnet Hysteresis

  4. Managing Hysteresis • Beam reproducibility requires magnet reproducibility • Keep Magnet On Loop (KMOL) mode forces magnets to stay on the curve • High-level applications must work with alarm handlers and other tools

  5. Setting a Magnet’s Strength • “Engineering” control: current • Useful when no field map is available • When running through the hysteresis curve • Optice control: field of the magnet • So applications can control magnets in an energy-independent manner • Magnet fudge factor

  6. Magnet Alarms • Difference alarm • Alerts operations to a mismatch on current • Outside range alarm • Alerts operations to a current being clipped • On-loop alarm • Alerts operations to a non-reproducible magnet

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