Last version:
FLUKA 2021.2.2, September 25th 2021
(last respin )
flair-2.3-0b 30-Jul-2021

News:

-- Fluka Release
( 25.09.2021 )

FLUKA 2021.2.2 has been released.
Fluka Release 30.07.2021 FLUKA 2021.2.1 has been released.
Fluka Major Release 18.05.2021 FLUKA 2021.2.0 has been released.
Congratulations from INFN: ,
Dear Paola,
I wish to congratulate you and all the authors and collaborators for this new Fluka release, which looks at the future and confirms the support of INFN in the development and continuous improvement of this code.
best regards
Diego Bettoni
INFN Executive Committee


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OPT-PROD

requests and controls production of Cherenkov, Transition and Scintillation Radiation in specified materials

See also OPT-PROP, Chap. (12).

For SDUM = CERE-OFF: switches off Cherenkov production

     WHAT(1-3): not used
     WHAT(4-6): assignment to materials, see below
     SDUM     = CERE-OFF

For SDUM = TRD-OFF: switches off Transition Radiation production

     WHAT(1-3): not used
     WHAT(4-6): assignment to materials, see below
     SDUM     = TRD-OFF

For SDUM = SCIN-OFF: switches off Scintillation light production

     WHAT(1-3): not used
     WHAT(4-6): assignment to materials, see below
     SDUM     = SCIN-OFF

For SDUM = CERENKOV: switches on Cherenkov production and defines photon energy range

     WHAT(1)  = minimum Cherenkov photon emission energy in GeV
                Default: 2.07E-9 GeV (2.07 eV, corresponding to 600 nm)
     WHAT(2)  = maximum Cherenkov photon emission energy in GeV
                Default: 4.96E-9 GeV (4.96 eV, corresponding to 250 nm)
     WHAT(3) :  not used
     WHAT(4-6): assignment to materials, see below
     SDUM     = CERENKOV

For SDUM = CEREN-WV: switches on Cherenkov production and defines photon wavelength range

     WHAT(1)  = minimum Cherenkov photon emission wavelength in cm
                Default: 2.50E-5 cm (250 nm, or 1.2E6 GHz)
     WHAT(2)  = maximum Cherenkov photon emission wavelength in cm
                Default: 6.00E-5 cm (600 nm, or 5.E5 GHz)
     WHAT(3) :  not used
     WHAT(4-6): assignment to materials, see below
     SDUM     = CEREN-WV

For SDUM = CEREN-OM: switches on Cherenkov production and defines photon angular frequency range

     WHAT(1)  = minimum Cherenkov photon angular frequency omega
                = 2 x pi x frequency (in rad/s)
                Default: 3.14E15 rad/s (corresponding to 600 nm)
     WHAT(2)  = maximum Cherenkov photon angular frequency omega
                = 2 x pi x frequency (in rad/s)
                Default: 7.53E15 rad/s (corresponding to 250 nm)
     WHAT(3) :  not used
     WHAT(4-6): assignment to materials, see below
     SDUM     = CEREN-OM

For SDUM = TR-RADIA: switches on Transition Radiation production and defines its energy range

     WHAT(1)  = minimum TRD photon emission energy
     WHAT(2)  = maximum TRD photon emission energy
     WHAT(3) :  not used
     WHAT(4-6): assignment to materials, see below
     SDUM     = TR-RADIA

For SDUM = SCINTILL: switches on Scintillation Light production and defines photon energy

     WHAT(1)  = i-th scintillation photon emission energy in GeV (i_max =3,
                see Note 4)
     WHAT(2)  > 0: fraction of deposited energy going into i-th scintillation
                   photon emission
          =< -100: forces to use a user routine (NOT YET IMPLEMENTED)
          >= -99.0 and =< 0.0: ignored
     WHAT(3) :  time constant of scintillation light in seconds
     WHAT(4-6): assignment to materials, see below
     SDUM     = SCINTILL

For SDUM = SCINT-WV: switches on Scintillation Light production and defines photon wavelength

     WHAT(1)  = i-th scintillation photon emission wavelength in cm (i_max =3,
                see Note 4)
                Default: 2.50E-5 cm (250 nm, or 1.2E6 GHz)
     WHAT(2)  > 0: fraction of deposited energy going into i-th scintillation
                   photon emission
          =< -100: forces to use a user routine (NOT YET IMPLEMENTED)
          >= -99.0 and =< 0.0: ignored
     WHAT(3) :  time constant of scintillation light in seconds
     WHAT(4-6): assignment to materials, see below
     SDUM     = SCINT-WV

For SDUM = SCINT-OM: switches on Scintillation Light production and defines photon angular frequency range

     WHAT(1)  = i-th scintillation photon emission angular frequency omega =
                2 x pi x frequency (in rad/s), (i_max =3, see Note 4)
                Default: 3.14E15 rad/s (corresponding to 600 nm)
     WHAT(2)  > 0: fraction of deposited energy going into i-th scintillation
                   photon emission
          =< -100: forces to use a user routine (NOT YET IMPLEMENTED)
          >= -99.0 and =< 0.0: ignored
     WHAT(3) :  time constant of scintillation light in seconds
     WHAT(4-6): assignment to materials, see below
     SDUM     = SCINT-OM

For all previous SDUM's:

     WHAT(4) = lower bound of the indices of materials in which the indicated
               Cherenkov, Scintillation or TRD photon emission range is defined
               From material WHAT(4)...
               Default = 3
     WHAT(5) = upper bound of the indices of materials in which the indicated
               Cherenkov or TRD photon emission range is defined
               ...To material WHAT(5)...
               Default = WHAT(4)
     WHAT(6) = step length in assigning indices
               ...in step of WHAT(6)
               Default = 1

     Default: (option OPT-PROD not given): no Cherenkov, scintillation or TRD
              photon production

Notes:

  • 1) Optical photons such as those produced by Cherenkov effect are distinguished by their FLUKA name (OPTIPHOT) and by their FLUKA id number (-1), as shown in (5).

  • 2) To transport optical photons, it is necessary to define the optical properties of the relevant materials by means of option OPT-PROP. Users can also write their own routines USRMED (which is called at every step and at boundary crossings when activated with MAT-PROP) and FRGHNS (which defines surface roughness).

  • 3) The energy/wavelength/frequency range as defined by OPT-PROD for Cherenkov photon production is not necessarily the same as that defined for transport by means of OPT-PROP. The default values, however, are the same.

  • 4) In case of scintillation light, only monochromatic photons are considered for the moment, with a maximum of 3 different lines. The lines can be defined repeating i times the OPT-PROD card with SDUM = SCINTILL

Example:

 * Request production of Cherenkov photons with energies between 2 and 3 eV in
 * materials 16, 17, 19 and 20, with wavelengths between 300 and 600 nm in
 * materials 18, 20 and 22, and with frequencies between 0.5 and 1 million GHz
 * in material 21
 *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
 OPT-PROD       2.E-9     3.E-9       0.0      16.0      17.0       0. CERENKOV
 OPT-PROD       2.E-9     3.E-9       0.0      19.0      20.0       0. CERENKOV
 OPT-PROD       3.E-5     6.E-5       0.0      18.0      22.0       2. CEREN-WV
 OPT-PROD     3.14E15   6.28E15       0.0      21.0       0.0       0. CEREN-OM
 * Optical photon transport requested between 300 and 500 nm for all materials
 * with number between 16 and 21
 OPT-PROP       3.E-5     5.E-5     6.E-5      16.0      22.0       0. WV-LIMIT
 * User routine USRMED called when an optical photon is going to be transported
 * in materials 17 and 21
 MAT-PROP         1.0       0.0       0.0       17.       21.       4. USERDIRE

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