User name paschke
Log entry time 19:24:39 on June14,2004
Entry number 125754
keyword=phase advance near target very good
Jay Benesch installed new optics today, and the phase advance is all
we need and more. Very nice.
Shown below in Figure 1 are the responses in the 12x (dispersive),
4A and 4B x and y bpms. The third x coil and 2nd y coil have moment
in 4A but not in 4B.
Also below in Figure 2 are the detectors and lumi monitor responses,
which are pretty cool to see. I guess one can conclude that we need
to change the coil strengths, and possibly select a subset of these
magnets, to maximize our sensitivity without driving the detectors
If there is a downside to the new optics, than it comes from the
Compton front. Reports are that the background in the Compton
was significantly larger today than yesterday, although there was
no indication on whether the problem was really the optics or some
other change to the machine.