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User name jroche
Log entry time 19:04:32 on November18,2010
Entry number 340693
This entry is a followup to: 340505
keyword=Tiefenbach energies at 4 passesTrying to look a bit more at the differences in beam polarization measured between 10/25:11/01 and 11/12:11/16, the question was raised of the beam energy stability. Below is the Tiefenbach energies reported during this period. The signal is somewhat noisy but in average the beam energy for these two periods is the same at the 0.1 MeV level.
Note: the beam polarizations measured in these two time periods should be the same but they differ by 2% on a systematic way. For DVCS this is not a big deal, the beam polarization is what it is. Yet this systematic difference is unexpected because though the injector Wien angles are differents during those two period the claim was that the beam polarization (or orientation) should be the same.
FIGURE 1
