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User name paschke
Log entry time 11:40:46 on October19,2005
Entry number 157413
keyword=Beam Intensity noise, Run 5741
There is a lot of beam intensity noise in Run 5741. I don't think this is a
big problem for us, although in general we'd like to be a little cleaner than
this... one can worry about non-linearities in position monitors, for instance.
Anyway, our laser still claims to be locked, with reasonable phase noise,
according to the MCC general tools screen. Sometimes this noise appears before
the laser loses lock... other times the noise just goes away without
intervention.
The apparent multipeak in charge asymmetry is not helicity correlated, and the
charge asymmetry and position differences are non-zero in the injector
suggesting that there is not a problem with the Pockels cell voltage or
helicity sequence. Just in case you were wondering.
Figure 1 shows asym_bcm1 vs time, Figure 2 shows the charge asymmetry for the
run (through event ~75k) and the same plot for events >60000.
FIGURE 1
FIGURE 2