g2n Analysis Meeting





    Kevin Kramer gave an update on g2n analysis:
        Kevin and Wolfgang Korsch have been checking the carbon asymmetries.
    They are agree on the QE data, but the results are not final.  Corrections
    need to be made to scalers and cuts.  Conclusion: false asymmetry is small
    and consistent with zero.

        Kevin worked on a simulation to study errors associated with data
    that has prescale factors.  Concluded that the error on the asymmetry
    is less than the "scaler" asymmetry, but more than the raw asymmetry
    (due to correlation).

        Kevin continued his work on understanding how the gradient coils
    affect the NMR signal fit.  Part of the problem comes from the fact that
    he does not know the gradient or H1 very well.  To solve the problem,
    Kevin plotted the log of Chi squared for the gradient vs H1.  Using this
    technique, H1 appear to be about 60 mG without the gradient coils on, and
    H1 appears to decrease with increasing gradient.   To fit the NMR signals,
    with gradient on, Kevin used a scaling factor he got from an empirical fit.

        Kevin checked the water calibration constants with the constants obtained
    from EPR measurements.  The two methods have reasonable agreement for
    each of the cells used.

        For the future experiment, Kevin will work with Vince Sulkosky to
    optimize the RF power by checking the capacitors from the RF capacitor
    box.  Also the effect of the preamplifier filters on the NMR shape will be
    studied.
 

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