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User name paschke
Log entry time 16:50:37 on January 9,2003
Entry number 91221
keyword=Rotating Waveplate setpoint (source)
Hall C has requested that the rotating halfwave plate (RWP) in the source optics be set to 129.8 degrees (or close, depending on the digital encoder). This should be near the second "zero crossing", and they do this as a favor to us. We will measure the charge asymmetry at this point and at a couple of nearby RWP setpoints when beam returns. We expect to be better than the ~2400 ppm charge asymmetry we saw at the previous setpoint.