Calculation detail:
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We had a vertical field, Long. RF, run 10:31:19 this morning: http://www.jlab.org/~bbsoftw/TargetReports/GenericLog/NMRField_02-11_10- 31-19.html The pumping chamber pickup coil reads 40mV. And base on EPR calibration last night(1.5%/mV), the pol at that time is 60%.
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Then at 10:49:19 this morning, target is lowered to Pickup Coil location. An NMR is performed at Long. Holding Field, Vert RF, and target chamber pickup coil: http://www.jlab.org/~bbsoftw/TargetReports/GenericLog/NMRField_02-11_10- 49-19.html The pickup coil reading are:
UpStream =240mV
DownStream =250mV
So the calib constant for target chamber pickup coils are roughly: 0.12%/mV * (UpStream NMR+ DownStream NMR)
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At 15:58:10, the target is lowered to pickup location again, and a same NMR is performed: Long. Holding Field, Vert RF, and target chamber pickup coil: http://www.jlab.org/~bbsoftw/TargetReports/GenericLog/NMRField_02-11_15- 58-10.html The pickup coil reading are:
UpStream =155mV
DownStream =160mV
Therefore the Pol at 4PM is ~38%