Dear Flemming, Claus and Ian,
Andrei had been worried that changes in
the ZDC setup had caused the shifts in the setup. However it
seems to me that the 10cm shifts in the ZDC -TPC vertex must
be due to termal effects since it is unreasonable to get 2
cables that differ by 3ps. The ZDC cables are rather long and
have quite different path lengths left and right so they may
not even be at the same temperature.
I would 2nd Flemmings suggestion of waiting a little while
for run 5383 and then we will work on the earlier runs.
Yours Michael
Quoting Flemming Videbaek <videbaek@sgs1.hirg.bnl.gov>:
> Claus,
> I think some slewing is needed otherwise the zdc vertex is only good to
> about 10 cm, which is not very good.
> My recommendation will be for Andrei to checkin slewings + vertex info
> for
> run 5383 and up and process those for
> globaltracks and give Andrei one or two more days to figure out the cal
> for
> the lower runs.
>
> Flemming
>
> ------------------------------------------------------
> Flemming Videbaek
> Physics Department
> Brookhaven National Laboratory
>
> tlf: 631-344-4106
> fax 631-344-1334
> e-mail: videbaek@bnl.gov
> ----- Original Message -----
> From: "Claus O. E. Jorgensen" <ekman@nbi.dk>
> To: <brahms-dev-l@bnl.gov>
> Sent: Tuesday, June 18, 2002 5:09 PM
> Subject: Re: your mail
>
>
> >
> > Hi Andrei
> >
> > Did you read Flemmings mail about the missing adc1 signal in the
> earlier
> > runs? Maybe it has something to do with that? Anyway, I dont think
> it's
> > very important to get the best zdc vtx achievable, if we just can get
> a
> > reasonalbe one to check the consistency with the bb counters. Maybe
> it's
> > not even necessary with slewing, have you checked how it looks
> without?
> > Is it possible to turn it off in the rdo module?
> >
> > Claus
> >
> > +-------------------------------------------------------------+
> > | Claus Jørgensen |
> > | Cand. Scient. Phone : (+45) 33 32 49 49 |
> > | Cell : (+45) 27 28 49 49 |
> > | Niels Bohr Institute, Ta-2, Office : (+45) 35 32 53 07 |
> > | Blegdamsvej 17, DK-2100, E-mail : ekman@nbi.dk |
> > | University of Copenhagen Home : www.nbi.dk/~ekman/ |
> > +-------------------------------------------------------------+
> >
> > On Tue, 18 Jun 2002, Andrey Makeev wrote:
> >
> > > Hi,
> > >
> > > there is some delay with calibraions for
> > > runs 4640, 4713, 5361-5368, since I have
> > > problems with slew-correction:
> > >
> > > for some reason in my BrZdcSlewCalModule.cxx
> > > code when I do fit of the profile hist with a
> > > specified fitting range (option "R" in Fit() method),
> > > for some reason ROOT? just ignores it and makes
> > > fit in the arbitrary range...
> > >
> > > Have anybody had something like this?
> > >
> > > Andrei.
> > >
> > >
> > >
> >
> >
> >
>
Michael Murray, Cyclotron TAMU, 979 845 1411 x 273, Fax 1899
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