double GetSCtdc_left(int i=0) {
return 0.5*(Det->tof[0][i].tdc[0] + Det->tof[0][i].tdc[1]); }
double GetSCtdc_right(int i=0) {
return 0.5*(Det->tof[1][i].tdc[0] + Det->tof[1][i].tdc[1]); }
we have the * 0.5 !
the current BlastLib2 on dblast07 has the v2_5_fixes branch
save a copy of your current BlastLib2 and from your
cvs directory then do
cvs up -d -r v2_5_fixes BlastLib2
however v2_5 is just as fine (changes are minimal and do not affect
you)
-- ________________________________________________________________________________ Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124 research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^On Wed, 11 Dec 2002, Peter Karpius wrote:
> No beam tonight. > > I spoke with Genya early on in the shift and he showed me some tdc offset > analysis he had done by hand. Genya's method is similar to mine in that > it still requires median values of sum and position histograms. It > however, does not require the length of the TOF in channels. I think > (Genya please correct me if I am wrong) the requirement of this length > factor is circumvented by specifying not only a central position target > (of zero - which my codes also does) but additonally specifying a target > sum channel (in this case I picked 2000 as it is in the middle of the tdc > range) This may reduce errors by alleviating the req for getting a median > of the diff histogram. > > I have been using two macros to run this algorithm. One cuts all paddles > on the opposite paddle 6 as this paddle can have coincs with all others. > >From the ttl:ttr plot, as Genya explained, we can easily cut on 6 for only > those events where the retiming signal provided the trigger. > > The second macro is the one I spoke about at the analysis meeting which > cuts on paddle combos with the highest statistics for backward angle > protons. (I am using this just as a comparison) > > Almost ready to show some results but I am confused by one thing (forgive > me if someone has said this before) > from eep: > I have taken ptl = (top - bot)/2 and ttl = (top + bot)/2 > is this correct? > > In TBLCut_coda.h it looks like the pos definition is missing a 0.5 out > front thus making it a diff and not distance from center. > > > 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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