User name Jin Huang
Log entry time 01:55:56 on October 08, 2008
Entry number 243566
This entry is a followup to: 243394
Followups:
keyword=Target Spin State in AnalyzerNew analyzer class has been coded to read in and process spin state
signal of he3 target.
New code includes
THaHe3Target : General He3 target
THaADCHe3Spin : Spin signal read in with a ADC
THaHe3SpinModule : Common module for any class supplying spin state
information
Above classes are temporarily included in bigbitlib
In goonlana directory, there is an example replay code for target:
replay_target.C. Also new database file, db_he3.dat are added.
2 copy of hardware spin state signal are send to Bigbite and Left HRS
DAQ respectively. signal read out from Bigbite is stable (see plot
below). However, 1% of ADC signal from left HRS would be randomly
missing (in run 1576 & 1577).
But since the target state only change every 20 min, it's safe to use
spin state in last event as the state for current one. Besides double
check between Bigbite and Left HRS signal will be performed in
THaHe3Target.
Following is a plot of spin state VS event number for run 1666. The
hardware spin signal source is simulating a spin flip every 10 second,
with 5 second transaction time (spin = 0 = unknown)
A copy of this log entry has been emailed to: yqiang@jlab.org, jpchen@jlab.org , ole@jlab.org
Spin signal look in Bigbite DAQ