TOFW

From: Djamel Ouerdane (ouerdane@nbi.dk)
Date: Wed Apr 26 2000 - 07:21:44 EDT

  • Next message: Flemming Videbaek: "Fw: geant and TOFW" 

    Hi Christian and others,

A comment and a question about the changes in write_geom_defs.F (that
creates
the gbrahms geometry file):
as far as I understood, the TOFW (or TFVV volume) is so far composed of
4 subvolumes
called TFP1. The main difference between these 4 volumes is the
orientation relative
to the mother volume TFVV (in other words, I think they are oriented so
as to face the
collision point).

The number 4 is the content of the variable tofw_no_panels,
The number 1 in TFP1 comes from the variable tofw_no_panel_types which
is set to 1.

So, these 4 TFP1 volumes have exactly the same name but  gbrahms makes
the
difference thanks to an internal unique number (given at volume creation
time I think).
But what we have now in the geometry file is just one set of TFP1
parameters and
I would rather think that we need 4 sets of TFP1 parameters.

But then, the question is: at reconstruction time (with brat stuff), how
can we make
the difference between one panel of type TFP1 and another of the same
kind?
So far, when the geometry file was read, a unique name corresponded to a
unique module
(e.g. TOF1 for hodoscope H1)

So, I suggest we rename these subvolumes TFP1 for the geometry filename
in the
spirit of the drift chambers: T3 and then T3A1 T3A2 and so on.
We could have:

Name: TFP1  Type: TOF
parameters

Name: TFP1A1 Type: TOF
parameters

and so on

We should also think about the DetectorParameters.txt file.

If all of this makes sense to you, tell me and I'll try to do the
changes...

Thanks,
Djamel

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             Djamel Ouerdane
             EMAIL  : ouerdane@nbi.dk
             OFFICE : Tb1 @ NBI
             PHONE  : +45 353 252 69
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