Dear Flemming and Djamel;
Let me add something to this discussion.
The digitization in DCs is done by applying BrDrivierDC which knows everything
about the DCs geometry. If e.g., the geant track, at some plane, is out of the
plane
active volume the DC hit is not produced. So, it could happen that for track
close to the
edge of the active volume, only some fraction of the track will be digitized.
There is also a simple way to check whether a gean track is within a DC volume
even
you don't do digitization.
In case of T5 just do :
BrDriverDC *T5Driver = new BrDriverDC("T5",T5");
......
Int_t TrackStatus = T5Driver->LineAcceptanceStatus(ghit->GetLocalLine(),0);
where ghit is a T5 geant hits associated with a given geant track. Second
integer
in LineAcceptanceStatus refer to the number of the most side wires (in x and y
view)
excluded from the acceptance. LineAcceptanceStatus returns
0 - track out of the acceptance;
2- track accepted at DC entry and at DC exit.
1- track accepted only at DC entry or only at DC exit.
Regards Pawel.
Flemming Videbaek wrote:
> Djam;
>
> Sometime what you see is correct. In this case the is no problem.
> In Brag the T4 size is the mastervolume of T4 the width of the sub-modules
> are
> in fact correct 50 cm so do not worry about this. You see the same feature
> for T5 and T3.
>
> Flemming.
>
> ------------------------------------------------------
> Flemming Videbaek
> Physics Department
> Brookhaven National Laboratory
>
> tlf: 631-344-4106
> fax 631-344-1334
> e
>
> > Hi Kris,
> >
> > I noticed another thing with the width of T4 (X direction):
> >
> > the DB says 50 cm, brag says 69 cm.
> >
> > If the DB is wrong, that could explain why I don't see many tracks
> > pointing to the first slats of H2 but I honestly don't know which number
> > is right.
> >
--
----------------------------------------------------------------------
| Pawel Staszel |
| Niels Bohr Institute Tb 8 email: staszel@nbi.dk |
| Blegdamsvej 17 phone: (+45) 35 32 53 51 |
| København Ø FAX: (+45) 35 32 50 16 |
| Danmark |
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