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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