Magnet measurement for the hall a compton dipole
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Magnet Measurement for the Hall A Compton Dipole. Ken Baggett. [email protected] Measurement System Quality. The stretched wire measurement system utilizes hardware that are “industry standard” for the magnet measurement “world” Stretched wire: Newport controllers

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Magnet measurement for the hall a compton dipole

Magnet Measurementfor the Hall A Compton Dipole

Ken Baggett

[email protected]


Measurement system quality
Measurement System Quality

  • The stretched wire measurement system utilizes hardware that are “industry standard” for the magnet measurement “world”

    • Stretched wire: Newport controllers

      • Positioning accuracy: 0.5μM

    • Voltage reading: HP3458A digital voltmeter with up to 100,000 point memory buffer.

      • dcV accuracy up to 8ppm

    • Power supplies: Danfysik or locally utilized powering system

      • 10 ppm stability

  • The system utilizes cross-checks to a stepper system to validate ∫Bdl:

    • Positioning:

      • Actual position is checked against set position and rotary encoder and calibrated using interferometer.

    • Hall probes:

      • NMR probes will be used on regular basis to accurately calibrate the Hall probe field strength curve.

    • Power supplies:

      • Currents checked with transducers

        Component quality, cross-checks, and process tests provide a high degree of confidence in the system’s performance.


Mmf measurement systems
MMF Measurement Systems

SW System

Rotating Coil System

3m Stepper Stand

5.5m Stepper Stand


Compton mapping
Compton Mapping

  • Measurements were taken in the Hall A line using the stretched wire measurement system and the power supply used to power the magnet in the hall.

  • Testing was done to verify repeatability of the stretched wire system in situ.

    • SW measurements are sensitive to vibration and wind.

    • Results show acceptable performance based on the requirements


Compton mapping1
Compton Mapping

  • Both shim plates show increase in BL

  • Mapping along hysteresis curve shows that previous Saclay map used a “top-down” approach

    • “top-down” agreement ~0.2%

    • Differences possibly tied to different length mapping coverage.




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