btw,
the retiming-or tdc value is filled in the field "tnr0"
that was not clear from the previous email
-- ________________________________________________________________________________ Tancredi Botto, phone: +1-617-253-9204 fax: +1-617-253-9599 research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^On Fri, 9 Aug 2002, Tancredi Botto wrote:
> > Hello, > I did make some changes to ntuple.C > a) The retimeOR is not C-box 0, I think it should be clear > to most that it was *never* plugged into that channel > b) Therefore ntuple.C was still filling the "rtOR" field with > a wrong value. Fixed > c) Changed slightly eep. Note we don't have (or need) a start > counter for the definition of time left, time right > > Having the retimeOR in ntuple allows me to plot it. Indeed L and R > sector are very well timed together, the retimeOR always come on the > some 10 channels!!!! > > The run in question here was with no field and there are no cuts. The > S/N (fast fast peak vs proton peak) has improved from the last runs > because of the slits. UNFORTUNATELY the blast power supply is down and I > only have little data (indeed very little) to show with field on. > > ----------- > c1.ps (1st attach) is "t_proton - t_electron".. > > Rows are 12L, 12R, 13L, 13R in coinc with paddles 2,3,4,5 of opposite > sector (columns). > > You can judge for yourself if protons hit symmetrically the L and R > sectors. Not very much so. The right sector detector subframe was aligned > today so having an asymmetrically closed detector should not be an excuse > anymore. Clearly this issue needs investigation > > ----------- > c5.ps (2nd attahc). For the boxes above (wich are LR, RL coincs) the > retime channel value. => Retiming is OK, amen. > > ------------- > > If you blow this up in a 2D plot "T-electron vs t_proton" you can > also see the region of the coinc windo were events are effectively well > strobed (ca. 45 ns, but I did not check for all paddles) > There are some issues also over here. SOme events may not be strobed > (then they should not be there!!) or may be strobed by a third channel > (triples, which are possible in the bckg). > > Careful when you analyze the "fast fast" coincs. These are > background/shower events which may not be so obvious > > Have a nice weekend > ________________________________________________________________________________ > Tancredi Botto, phone: +1-617-253-9204 fax: +1-617-253-9599 > research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949 > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >
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