Log entry time 14:41:01 on February28,2006

Entry number 164518

I don't know if this is old news, or new news, but I'm gonna answer the 
questions I've been asked, anyway.

The parity DAQ has not detected any problems with helicity, or with the QRT 
signal.  (This DAQ has not been running continuously, so intermittent problems 
are not fully ruled out.)  

Run 7041 is ~140k helicity windows (about 1.3 hours) long. In this run, there 
were zero detected "sequence" errors, which check both pairsynch and helicity 
signals.  Below, I attach figure 1 to show that the QRT is _always_ 4 windows 
separated from the last.

Just to be clear: the charge asymmetry plots in the halog have also 
demonstrated that the helicity information is good.  Bad helicity control 
signals create pathological multi-peak, which are not observed in the large 
charge asymmetry checks performed this morning.

So, I do not believe that there is any problem with helicity.  If we continue 
to suspect intermittent problems, we should run the HAPPEX DAQ continuously to 
verify the integrity of the helicity board.  For now, suspicion should be 
focused downstream of the separation of helicity signals in the counting house.