Dear Djamel,
I think Flemming is right about the
2 offsets and also the width of the distributions.
Since the ZDCs are sensitive to upstream stuff the
width of the distribution gives us some handel of
the signal to background. As the vacuum gets better
the ZDC vertex distribution should get better.
Yours Michael
Quoting Flemming Videbaek <videbaek@sgs1.hirg.bnl.gov>:
> Djamel,
>
> We need this, but also a breif discussion on this.
>
> On the ZDC you need two offsets one for the 'regular discrimintarors'
> and
> one for the
> offsets determined by the constant fraction discriminators.
>
> Possible you also want to store the deduced values of sigma's between
> TPM1,
> BB, ZDC,.. since these
> values have to be used in analysis later for data selections
>
> Since you admit beeing ignorant maybe you should have waited createing
> the
> entry - but since done
> please change once we have agreed on the content.
>
> Flemming
>
>
> ------------------------------------------------------
> Flemming Videbaek
> Physics Department
> Brookhaven National Laboratory
>
> tlf: 631-344-4106
> fax 631-344-1334
> e-mail: videbaek@bnl.gov
> ----- Original Message -----
> From: "Djamel Ouerdane" <ouerdane@nbi.dk>
> To: <brahms-soft-l@bnl.gov>
> Sent: Friday, November 02, 2001 6:22 AM
> Subject: new brat version 2.1.20
>
>
> > Hi all,
> >
> > Since I'm on night shift but don't need to be focused on the machines
> (cf
> > latest shift report), I've added a couple of new things in brat,
> therefore
> > tagged it BRAT-2-1-20, and bumped the version number to 2.1.20
> >
> > Changes:
> >
> > added new class BrVertexCalibration, that deals with the offsets.
> >
> > I think it is rather important to have this information in the SQL db
> > since it needs some revisions like other things. In that purpose,
> I've
> > created a new entry in the SQL db (rcas0005 only), called VERTEX
> > (the type is BEAM).
> >
> > It has 3 parameters:
> > tpcVertexOffset (mainly for TPM1 in the Y direction)
> > bbVertexOffset (3 elements: bug, small and fastest tubes)
> > zdcVertexOffset (1 element - but I confess my ignorance on the ZDC
> > vertex, needs to be checked further).
> >
> > The BB and ZDC offsets are deternmined with TPM1 tracks, therefore in
> the
> > Z direction.
> >
> > The modules/calib dir has a new subdir: vertex
> > The classes are (so far):
> > BrVertexCalModule (base class)
> > BrBbVertexCalModule
> >
> > (the TPC and ZDC are not yet available)
> >
> > The scripts/calib/bb dir. has 2 new scripts:
> > BbVtxOffset.C
> > CommitVtxOffset.C
> >
> > There usage is very simple but requires you have the latest
> > BrBbCalHitsModule and BrBbVertexModule that I've updated to deal with
> the
> > calibration (minor changes but necessary to be able to do it).
> >
> > I had to update configure.in and config/config.mk so that the
> makefiles
> > are generated and so on.
> >
> > I've tested it and it gave me very nice results. I inserted into the
> sql
> > DB as a test the BB offset values for run 5036.
> >
> > There are still a couple of things to update but it will come soon
> (since
> > I won't have many shifts now).
> >
> > I must confess one thing: I couldn't test the thing from a new version
> of
> > brat since my own brat has a lot of new things that will be committed
> this
> > week-end (tracking thing and tof cal.)
> > So, if you check out a new brat and can not compile and run the stuff,
> I
> > am the one to blame and I'll fix your problem asap.
> >
> > Ciao
> >
> > 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
> >
>
Michael Murray, Cyclotron TAMU, 979 845 1411 x 273, Fax 1899
This archive was generated by hypermail 2b30 : Fri Nov 02 2001 - 13:34:20 EST