The bunch crossing QA have been done for run13 period 2 data.  The procedure are same with that used for period one. 

1.  Expect for some very low luminosity runs, all the bxing spectrum look good.  For bX7, all the offset values equal to zero as expected. For bX48, the offset values randomly distributed in range 0-119. 

2. From the chi squared minimum distribution, we can see several peaks, which indicate there may be some unexpected empty bunches.  After checking the bX7 spectrum run by run, expecially, the runs under the peaks, 7 fills contain bad bunches which should be masked out.

 

 

This is the plot of the chi squared Minimum distribution.  

The following 7 plots show the bX7 spectrums for 7 example runs from 7 fill which have bad bunches.