YES, keep the NC unplugged. The neutron OR sum is giving again problems
although last time we had this we traced it a bad "card" in the ecl
trigger panel (the one where you input bit 16 to the L-sector MLU). It
seems we are having the same problem !!
After taking the card out, we concluded that it was fine, maybe
the jumpers were not all the way in. There might be something else.
remember, when the Wch take data forget about the NC.
In general we should have NC data in the data stream even if we do not
connect it to the trigger as they will make it to the ADC anyways. So if
you prefer, do nothing and leave the neutron OR's unplugged.
Else, one solution is to take NC data with the left NC plugged in RMLU
but that's ugly.
If you are brave enough, try replace the 4516. The problem could
also be with the 2->1+1 ecl cable. It of course, has no 17th pin
but that is fine for all others.
-- ________________________________________________________________________________ Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124 research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^On Fri, 8 Nov 2002, Adrian T Sindile wrote:
> Last night people reported problems with first 8 left TOF signals. > We have been taking cosmics data all day and no problem was found with > those TOFs (except that LTOF 9 seems to give a little less events than its > neighbors). However, we could see a lot of problems with the right sector > TOF signals. > > Taking runs 2665, 2666, 2667 with cosmicTOF_CC.settings we saw lots of TDC > and ADC spectra missing (for the same detectors). > RTOF4 was traced to an unplugged cable - that is not plugged all the way > at the PMT after the mu-metal job, we think... we fixed it. > > Next, we changed the trigger to cosmicTOF.settings (putting Cerenkovs in > X-mode): RTOF0,1 and 2, missing before completely were back now! The > number of events was also improved for other detectors (run 2668). > > We were still missing completely RTOF14 and 15, and were still having low > number of counts in others... > > We went to the D-tunnel and started troubleshooting; we went through all > the trigger, nothing was wrong, we could trace all the signals and all > were making sense from the BNC cables to the TDC inputs... > > The only significant thing we did after two hours of plugging and > unplugging cables was to disconnect the twisted pair cable that seemed to > come from the back of the NC retiming unit into the input of the trigger > supervisor (the orange wire). It was not being used anyway, but nothing > else was looking weird... > > We took run 2670 and all spectra were back now!!! > > Conclusions: > - plugging and unplugging cables changes things completely (unless that > unused wire created somehow all the trouble, which is unlikely); > - the Cerenkovs seemed to have been denying lots of events again - see the > difference between runs 2667 and 2668; > - the TOFs should be now ready to take data - if there is something wrong, > it is probably because of the trigger settings (beam etc.) > > Jason and Adrian > > ------------------------------- > Adrian Sindile > Research Assistant > Nuclear Physics Group > University of New Hampshire > phone: (603)862-1691 > FAX: (603)862-2998 > email: asindile@alberti.unh.edu > http://einstein.unh.edu/~adrian/ > >
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