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The module geometry was designed trying to profit of the big degree of
symmetry of the calorimeter structure. The first version of this geometry was
realized in rectangular shape [Implementation to FLUKA package was done
by: G. Battistoni, B. Di Micco, A. Ferrari, A. Passeri
and V. Patera ] with the material description given in the previous
section.
FLUKA allows to define a symmetric geometric structure as recursive isometric
transformations of a base structure. The base structure (referred to as base cell in the
following) has to be defined in its shape and material composition, while the
transformed regions (referred to as replicas in the following) are defined as void boxes whose boundary surfaces can be
overlapped to the boundaries of the base cell. At the tracking level each time
a particle enters in a replica region a transformation is performed in the
base cell. The particle is propagated in the base cell and transformed back to
the replica when it reachs the boundary of the base cell. These
transformations, forward and backward, have to be provided by the user in the
lattic.f routine whose code is reported in source code area .
In the reference system shown in Fig. 3
(the blue axis denote the frame which was used for
simulations with FLUKA, the red coordinate system
presents the coordinate frame of the KLOE detector) the base cell
has dimensions of
52 cm x 1.2 mm x 430 cm, it consists of a lead block filled with
385 scintillating fibers and
glue cylinders (Fig. 4).
Figure 3: The coordinate systems used in simulations. |
Figure 4: Details of the implementation of the calorimeter layers [3]. |
Figure 5: Cross section of the EmC module with rectangular and trapezoid geometry. Visualization by the FLAIR program [4] using as an input a geometry setup files of FLUKA. |
Figure 6: The KLOE fibers schematic view. |
Figure 7: Structure of the single module with trapezoid shape. |
Figure 8: Distribution of energy deposits in scintillating fibers of a single unit of the electromagnetic calorimeter. |
Giuseppe Battistoni; INFN, Milano
Jaroslaw Zdebik; UJ, Cracow
Last updated: 26th of October, 2010