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FLUKA: 12.2.3} Input Example no. 1: Only Cherenkov light is generated Previous Index Next

12.2.3} Input Example no. 1: Only Cherenkov light is generated

 Cherenkov light generation depends on the refraction index. Among the
 different possibilities, here we have chosen to give the refraction
 index by means of the user routine shown above.

 The relevant data cards are commented.

 The value inserted for light absorption in this example is arbitrary, while
 the mean free path for Rayleigh scattering is the result obtained
 from measurements performed in the framework of the Icarus collaboration.

 TITLE
 Test of Cherenkov light production in Liquid Argon
 DEFAULTS                                                              PRECISIO
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+
BEAM -10.000 MUON+ BEAMPOS 0.0 0.0 190.0 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
* Switch off electron and photon transport
EMF EMF-OFF
*
MATERIAL 18.0 0.0 1.400 18.0 ARGON
* Select neutron cross sections at liquid argon temperature
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 3.500E-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 scintillation light production in material n. 18 (Liq. Argon)
OPT-PROD 18.0 SCIN-OFF
* defines Cherenkov production for material n. 18 (Liq. Argon)
OPT-PROD 1.100E-05 5.500E-05 18.0 CEREN-WV
* The following card restores the wave-length limits for material n. 18
OPT-PROP 1.000E-05 3.500E-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 is actually generated.
* Fluctuations are properly sampled
OPT-PROP 0.1 0.1 SENSITIV SCORE 208.0 211.0 201.0 210.0 RANDOMIZ 1.0
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+
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 10000.0 STOP

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