g2n Analysis Meeting
Kevin Kramer gave an update on the
QE and False Asymmetry Studies:
-
Discrepancy between Kevin's and Wolfgang's analysis
-
Attempt to resolve differences and discovered Wolfgang
wasn't using
spectrometer
survey corrections
-
After correction, Wolfgang and Kevin's analysis agreed
on 1 run
-
Both will do analysis independently and check afterwards
-
Collaboration concerned, since spectrometer survey
corrections
should have
no effect on false asymmetry, Wolfgang should check
to see
what caused the problem
-
Kevin did a preliminary check by cutting on the end
windows for
the false
asymmetry. Need a more in depth check
Kevin gave an update on the target analysis:
-
NMR analysis:
-
Challenges include: lousy water signals, 4 different
pick-up
coil positions, and gradient coils used for masing
-
Advantages: 10 water calibrations, sufficient
parallel EPR data
-
Need good value for H1 and field gradient to calibrate
NMR
using gradient
coils
-
Measured H1 inconsistent with width of NMR signals
-
Created a shape generator that takes H1 and gradient
as input and
outputs
signal corrected for lock-in time constant, H1 and gradient
broadening
-
"Works" for helium and water, but data does not fit
correctly
-
Q-curve analysis:
-
Q-coil deteriorated during course of experiment
-
Gain doesn't seem to change with configurations
-
Water calibrations: 4 configurations, all consistent
except for 1 number
-
Target polarization:
-
Shapiro is ok, but Va1 is off from EPR (grad. coil
on)
-
Water calibration constant from EPR comparable with
NMR
-
Relative error on temperature ~ 5 degrees C
-
Summary of NMR analysis:
-
New approach not working too well
-
Need to fit it. Zein-Eddine suggested that maybe
the side points should be given more weight
-
g2n results summary:
-
Preliminary results shown at UVa Spin Conference and
APS meeting
-
Keith Griffeon responsible for RC
-
Use EPR data for target polarization
Kevin's future work:
-
Replay data w/ new ESPACE (bpm data, new optics)
-
Resolve QE data
-
Dilution factor
-
Elastic data
-
Study RC
-
Finish NMR analysis
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Target holding field analysis
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