Main INDEX
Monthly INDEX
PREV
NEXT
User name R. Michaels
Log entry time 00:54:22 on January17,2004
Entry number 115904
keyword=Comments on coinc time and T7
Figs 1 and 2 show the coincidence time for trigger T7.
First comment is that the way to pick out a trigger N is
D.evtypebits&(1 < < N).
Do not use D.evtype.
Second comment is that the online analysis GUI emphasizes T5
since mostly T5 appear in the data with a bump. Few T7 have
a bump. There is a hint, however, that they may be good kaons,
but this needs further check.
Thirdly, the L-arm measure of the coinc. time is dangerously
close to the limit (12 bits = 4096). Since the S2m TDCs have
a minimum value at 1500 channels, we can easily afford to add
25 nsec to the start of the TDC that serves to measure both
S2m TDCs and coinc. time. (Of course this requires a short
access and would require a new timing calibration.)
Finally, given the uncertain nature of T7 it would be wise
to keep more T5, which we will do. Prescales adjusted.
FIGURE 1
FIGURE 2