Log entry time 01:36:14 on April 04, 2010

Entry number 316050

We used Seamus' much improved optics to replay the lead counting mode
data from last night.  The "magic" cut doesn't seem to work for the
better replayed data.  I did try moving it around a bit, perhaps I didn't
implement it correctly.

Anyway, since the replay is much better we can look for A_T events at the
collimator where they ought to be reconstructed.

Figure 1 shows the reconstructed sieve for carbon and a proposed new cut.
 The only cut.  
Figure 2 shows the slices of the focal plane (A_T candidates visible)
Figure 3 shows the reconstructed sieve for carbon and the symmetrical cut. 
Figure 4 shows the slices of the focal plane (distinct lack of A_T
candidates)
Figure 5 shows lead data and the proposed cut. 
Figure 6 shows the slices of the focal plane (A_T candidates visible)
Figure 7 shows lead data and the symmetrical cut. 
Figure 8 shows the slices of the focal plane (no A_T candidates)

I think this data seems like pretty strong evidence for seeing the A_T.

When this analysis is blindly applied to the runs that Bob suggested,
neither run shows any A_T candidate events.  This technique does require
good reconstruction though, so perhaps it will work when we can get the
Tune A sieve pattern looking this good.  As it is, Figure 9 shows the
reconstruction for run 26864 which is a Tune A.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9