CERN homepage INFN homepage
FLUKA: 12.2.4} Input Example no. 2: Only Scintillation light is concerned Previous Index Next

12.2.4} Input Example no. 2: Only Scintillation light is concerned


 Here it is necessary to point out that, at present, FLUKA can generate
 scintillation lines only for monochromatic lines. A maximum number of 3
 different lines is possible. The value inserted here (128 nm) is the correct one
 for Liquid Argon. The fraction of deposited energy going into scintillation light
 depends on the degree of recombination after ionisation.

 Again, the value used here is a parameter justified in the framework of the Icarus
 collaboration, where about 20000 photons/MeV of deposited energy have been
 measured for the electric field of 500 V/cm (the field used in
 Icarus). A different electric field intensity will change the degree of
 recombination and therefore the light yield.

 TITLE
 Test of scintillation light production in Liquid Argon
 DEFAULTS                                                              PRECISIO
 BEAM      -0.5000                                                     MUON+
 BEAMPOS    0.0        0.0      199.0                                  NEGATIVE
*
DELTARAY -1.0 18.0 18.0 PAIRBREM -3.0 18.0 18.0 MUPHOTON -1.0 18.0 18.0 PHOTONUC -1.0 3.0 100.0 IONTRANS -6.0 DISCARD 27.0 28.0 43.0 44.0 5.0 6.0 GEOBEGIN COMBINAT Test
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+
* A large box for the blackhole
RPP 1 -9999999. +9999999. -9999999. +9999999. -9999999. +9999999.
* A SMALLER BOX FOR FOR LIQUID ARGON
RPP 2 -200.0 +200.0 -200.0 +200.0 -200.0 +200.0 END
*== Region Definitions =================================================
* 1) Blackhole
BL1 +1 -2
* 2) Liquid Argon
LG3 +2 END GEOEND
*
EMF EMF-OFF
*
MATERIAL 18.0 0.0 1.400 18.0 ARGON LOW-MAT 18.0 18.0 -2.0 87.0 ARGON ASSIGNMAT 1.0 1.0 500. 1.0 0.0 ASSIGNMAT 18.0 2.0 2.0
*
* Set Light production/transport properties: from 100 to 600 nm in all materials
OPT-PROP 1.000E-05 1.280E-05 6.000E-05 3.0 100.0 WV-LIMIT
* Set all materials to "metal" with 0 reflectivity:
OPT-PROP 1.0 3.0 100.0 METAL
* resets all previous properties for material n. 18 (Liquid Argon)
OPT-PROP 18.0 RESET
* switches off Cherenkov light production in material n. 18 (Liquid Argon)
OPT-PROD 18.0 CERE-OFF
* defines Scint. light production for material n. 18 (Liq. Argon). Parameters:
* a) wavelength (cm) of first scintillation line.
* b) fraction of deposited energy going into scint. light
* (in Liquid Argon ~ 2 10**4 photons/MeV)
OPT-PROD 1.280E-05 9.686E-02 18.0 SCINT-WV
* The following card restores the wave-length limits for material n. 18
OPT-PROP 1.000E-05 1.280E-05 6.000E-05 18.0 WV-LIMIT
* The following card, for material n. 18:
* a) calls the RFRNDX user routine (to define the refraction index
* vs wave-length (
WHAT(1)
< -99)
* b) sets to 1000 cm the mean free path for absorption.
* c) sets to 90 cm the mean free path for Rayleigh scattering
OPT-PROP -100.0 0.001 0.01111 18.0
* The following card defines the "Sensitivity" in order to introduce the
* maximum Quantum Efficiency at generation level. Here 1/10 of photons are
* actually generated.
* Fluctuations are properly sampled
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+
OPT-PROP 0.1 0.1 SENSITIV SCORE 208.0 211.0 201.0 210.0 RANDOMIZ 1.0
*
USRBDX 1.0 -1.0 -55.0 2.0 1.0 Opt.Phot USRBDX 12.0E-09 0.0 120.0 & USERDUMP 111. 2. MGDRAW START 10000. STOP

Previous Index Next