Measurement and Characterization of a 5T Solenoid Field

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Presentation transcript:

Measurement and Characterization of a 5T Solenoid Field Jason Morgan April 2018

CLAS12 CEBAF Large Acceptance Spectrometer for 12 GeV 3.58T toroidal magnet 5T Solenoid

5T SOLENOID Shields the detectors from the background Gides high angle particles to the detector 5 coils, 4 main + 1 shield coil 5T central field at 2416A Installed September 2017 Magnetic field mapped September – October 2017

FIELD MAPPING

FIELD MAPPING Template board with hole to mount probe tube 38 runs of data were looked at at r=0, r=1.25cm and r=30cm Runs were conducted with various angles of rotation for r = 1.25cm and r=30cm runs Probes were rotated in the holder at angles of 90, 180 and 270 degrees Long runs were performed in steps of 2cm spanning a total distance of 200cm Short fine integral runs were performed in 1mm steps spanning a total distance of 10 cm Hall probes were inserted in the tubes and pushed down the z axis

FINDING THE CENTER Found the center by reflecting the data about various z values Performed a χ2 test and selected the minimum χ2 Calculated χ2 for surrounding z values and fit with a quadratic model Projected this model in 0.01cm steps and selected the minimum to establish the center point for each run Center z long runs is 89.8  2.3 cm, short runs is 53.4 mm  5.0 mm.

TRANSLATIONS Probe Rotation (pr) NormalizedBx = NormalizedBy = Bx By Bx By 90 -Bx 180 -By 270

RESULTS

RESULTS

RESULTS

RESULTS

RESULTS

RESULTS

RESULTS

RESULTS

RESULTS

Conclusions and Outlook Center z values vary by ±2.3cm between long runs Center z values vary by ±0.50cm between short runs There appears to be motion on the probe holders other than along the z axis Isolate contribution of probe motion Parameterization of the deviations from the model