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....+...
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
