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User name Howell
Log entry time 15:06:14 on January 7,2001
Entry number 32549
keyword=COSMIC runs
The present timing in NPOL trigger circuit requires one adjust to switch between
cosmic runs (in which rear TDC timing is needed) and production running. Cosmic
data for the front detectors and vetos can be made without the adjustment, i.e., with
the same time settings as for production running.
The width of the gate and delay generator (NIM crate = 5, slot=4, channel=1) should be adjusted for the two types of runs:
Run Type G&D width
production 130 ns
cosmic 45 ns
A pocket pulser is attached to the NIM crate. To make the adjustment disconnect the
input to the G&D and use the pocket pulser to trigger it. Don't forget to reconnect
the input after the adjustment is done. The NIM crate #5 is locate in rack CH03B19.
Warning: You should check the delta TOF histogram after making the adjustment for production data. A good DTOF spectrum has one smooth peak. A bad
DTOF spectrum has a lot of sharp structures.