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[ <--- prev -- ] [ HOME ] [ -- next ---> ] ## OPT-PRODrequests and controls production of Cherenkov, Transition and Scintillation
Radiation in specified materials
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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