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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Presentation Transcript
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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