Last version:
FLUKA 2021.2.8, November 20th 2022
(last respin 2021.2.8)
flair-2.3-0c 11-Sep-2022

News:

-- Fluka Release
( 20.11.2022 )

FLUKA 2021.2.8 has been released.


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  The energy deposits are computed by FLUKA [6] taking into account the Birks effect [7] (see equation 1), that is the saturation of the light output (L) of a scintillating material when the energy release is high [6]. For high densities of energy deposition, due to the quenching interactions between the excited molecules along the path of incident particles, the light output is not changing linearly with the energy deposition but instead it can be described as [8]:

Birk [1]
This law describes the light output of (organic) scintillators [8]. The luminescence at low specific ionisation density depends on the particle type and the material, and the parameters c1 and c2 are equal to [3]:
c1 = 0.013 cm2MeV-1
c2 = 9.6 x 10-6 cm3MeV-2
A proper attenuation length parameter for fibers material in order to calculate a light intensity at each side of the module was taken into account. The attenuation function of fibers was described with the following formula:
attenuation [2]
where y is distance between the place of deposited energy and the photocathode. The attenuation factor B is the ratio between detected and generated light signal which changes as a function of the distance (on y axis) from the generation point to the photocatode. The module consists of two types of scintillating fibers: "Kuraray" and "Pol.hi.tech" [2]. The first are implemented until a depth of 12 cm and the remaining part of the module is built with latter type of fibers. The value of the parameters for "Kuraray" and "Pol.hi.tech" are shown in Table 2.

Table 2: Fibers parameters.

A lambda_1 [cm] lambda_2 [cm]
Kuraray 0.35 50 430
Pol.hi.tech 0.35 50 330


Giuseppe Battistoni; INFN, Milano
Jaroslaw Zdebik; UJ, Cracow


Last updated: 26th of October, 2010

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