User name R. Michaels
Log entry time 12:23:45 on April23,2007
Entry number 199761
keyword=T5, T6 overlap check
I made some checks of the T5 and T6 overlap with pulser.
Of course, we had done this before the experiment too.
There is some concern that perhaps one of these triggers
becomes inefficient due to wrong timing.
The picture shows the R-arm signal with 'RRRRR' and the
L-arm signal with "LLLLL", and the horizontal direction
is time (length of string proportional to time).
The L-arm is T3 in each case, and T3 always defines the timing.
T5 = T1.and.T3
RRRRRRRRRRRRRRRRRRRRRRRRRR T1, 132 nsec wide
........LLLLLLLLLL............ T3, 52 nsec wide, delayed 23 nsec
T6 = R-arm-RT .and. T3
RRRRRRRRRRRRRRRRRRRRRRRRRRRRRR R-arm RT, 158 nsec wide (fluct to 198)
..........LLLLLLLLLL.............. T3, 52 nsec wide, delayed 34 nsec
These pictures are stable with pulser down to a He4 momentum of
about 1000 MeV/c. Below that we have dynamic range problem
of the EDTM (pulser), and the L-arm slides later but is always
making a trigger. For physical signals the picture should be
stable, of course. The R-arm can have a range of 20 nsec across
the focal plane but will always make a trigger.
I double checked that the delays don't run out of dynamic range.
Conclusion: everything is fine.