Make New Entry, Make Followup Entry
User name R. Michaels
Log entry time 03:47:47 on September19,2009
Entry number 290465
This entry is a followup to: 290456
keyword=Compton Edet AsymmetriesCompton Electron Detector in ETROC-Only DAQ config.
A preliminary asymmetry analysis of run 19509 is shown.
The helicity is delayed by 8 windows and I use the 40 Mhz
clock to shift forward. This might need some more work,
plus background subtraction etc. Nevertheless an asymmtry
is seen which flips with laser state. This is a 25 minute
run. The statistical errors are 0.6 % per strip for each
laser state. We took 2 hours of data in this config but I have
not analyzed it all yet. In 4 hours we can achieve 0.2% per strip
per laser state.
As an "idiot check" I re-analyzed the run 19509 with the helicity
delayed by 7 instead of 8 windows. The asymmetry should disappear
(see fig 2).
Plane D will be posted shortly. More details in Compton Elog.
FIGURE 1
FIGURE 2
