Djam et others,
The jump in dang for MRS is related to the fact that run 5738-5748 are all
MRS zero field run and shows how
nicely the geometry is. The non-zero value for MRS has to do with the mom
dependent dang as we know about but do not understand. This effect is also
present in FS if you look at a profile for dang vs p.
The deviation in FS from 0 also comes from the magnet geometry you use (2.1
deg vs correct 1.95 for D2)
see e.g. 3aand40.mag where you have [5.10 rather than 4.95]. Of course we
hope to have the geom settled in the near future.
Flemming
------------------------------------------------------
Flemming Videbaek
Physics Department
Brookhaven National Laboratory
tlf: 631-344-4106
fax 631-344-1334
e-mail: videbaek@bnl.gov
----- Original Message -----
From: "Ian Bearden" <bearden@nbi.dk>
To: <brahms-l@bnl.gov>
Sent: Tuesday, February 05, 2002 4:21 AM
Subject: RE: Track matching offsets
> Hi Djam, others,
> I think that one of the reasons that the deltaY fluctuates in the MRS more
> than in the FFS is that TPC drift velocities have been calibrated for the
> FFS. I don't think that it was done for the MRS. Of course, Peter did
all
> the work, so I am sure that he will correct me if I am wrong.
> Cheers,
> Ian
>
> > -----Original Message-----
> > From: owner-brahms-l@bnl.gov [mailto:owner-brahms-l@bnl.gov]On Behalf Of
> > Djamel Ouerdane
> > Sent: 4. februar 2002 20:05
> > To: brahms-l@bnl.gov
> > Subject: Track matching offsets
> >
> >
> > Hi all,
> >
> > During some analyses, I had to determine track matching offsets
> > in the MRS
> > and FFS (BFS is on its way) for a big bunch of runs. In order not to get
> > bored, I made a script to do it fast. You can check the result here:
> >
> > http://www.nbi.dk/~ouerdane/match
> >
> > You will notice some funny behaviours in dY and dAng as a function of
run
> > number.
> >
> > The FFS tracking shows that it's fairly stable, despite a few jumps (I
> > checked the histograms and it really did that!)
> >
> > The MRS is not as stable. Notice also how dAng goes to zero for the
> > later runs (after 5730).
> >
> > Of course, these runs have different field settings and background
> > conditions. But it's nice to see the behaviour of these offsets over
this
> > long period of time.
> >
> > Djam
> >
> > --
> > Djamel Ouerdane ------------------------------------------o
> > | Niels Bohr Intstitute | Home: |
> > | Blegdamsvej 17, DK-2100 Ø | Jagtvej 141 2D, |
> > | Fax: +45 35 32 50 16 | DK-2200 Copenhagen N |
> > | Tel: +45 35 32 52 69 | +45 35 86 19 74 |
> > | http://www.nbi.dk/~ouerdane |
> > | ouerdane@nbi.dk |
> > o---------------------------------------------------------o
> >
> >
> >
>
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