My (very simple!) analysis of last night shows that
the TOF efficiency is ca. 90 % (L1&L2) and is ca. 80% (L0 andL3)
at the edge of a cerenkov box. I require the Cerenkov to be hit.
Conversely, the LC0 (cerenkov) efficiency was 70-75 %
However last night we ran without the slits. It is possible that this
can explain part of the missing efficiency (see logbook). The last slit
setting is one page 150 logbook 3.
Abbi also replaced the low counting paddle with a better one.
We are ready for beam.
*Note: instructions to load a new mysql HV database are on pg9, logbook 4
(!)
--tancredi
________________________________________________________________________________
Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124
research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949
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