[BLAST_TOF] evening shift Oct 5

From: Peter Karpius (karpiusp@einstein.unh.edu)
Date: Sun Oct 06 2002 - 00:06:21 EDT


Tried to help Doug get Cerenkov's in the trigger.

Using trigger: elastic_tof_wire_cerenkov.settings
Saw Cerenkovs on the scalers but physics trigger rate was ~1Hz with wire
in halo giving 4 minute lifetime ~20-40mA. (i.e. plenty of beam to give
coincs)

Cerenkov box analog signal looks good on scope (> 110mV with scope on avg)
for forward boxes. Thresholds at 25mV.

Checked Cerenkov timing on scope wrt TOF's at input to sector MLU's.
Saw that TOF pulses were clearly inside Cerenkov pulses.

Tried asking for singles trigger only with Cerenkov and TOF on left only
and an X for right and vice versa - this gave a good rate of 200-300Hz for
each sector physics trigger.

Checked sector MLU inputs to XMLU. Trigger scope on left -> sector saw no
right
sector, trigger on right sector saw no left. Spoke with Tancredi about
this and tried checking and double checking but in the end let Doug go
back to his data taking with Cerenkovs in X.

Next step: use flasher to check timing again with Cerenkovs in trigger?

                                                Pete
                                                
-------------------------------
Pete Karpius
Graduate Research Assistant
Nuclear Physics Group
University of New Hampshire
phone: (603)862-1220
FAX: (603)862-2998
email: karpiusp@einstein.unh.edu
http://pubpages.unh.edu/~pkarpius/homepage.htm



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