Optical Transition Radiation

Hello FLUKA team,

Could you please help me to figure out about Transition Radiation simulation in FLUKA.
I’m trying to get Transition Radiation from Al disk irradiated by 40MeV electrons.
An input is below - but always gives empty USRBIN output …

Thank you,
Andrei

TITLE

  • Set the defaults for precision simulations
    DEFAULTS PRECISIO
    PHYSICS 3. EVAPORAT
    PHYSICS 1. COALESCE
  • Define the beam characteristics
    BEAM -0.04 -1.2 -1.2 ELECTRON
  • Define the beam position
    BEAMPOS -2.
    GEOBEGIN COMBNAME
    0 0
  • Black body
    SPH blkbody 0.0 0.0 0.0 100000.
  • Void sphere
    SPH void 0.0 0.0 0.0 10000.
  • Cylindrical target
    RCC target 0.0 0.0 0.0 0.0 0.0 0.1 1.7
    END
  • Black hole
    BLKBODY 5 +blkbody -void
  • Void around
    VOID 5 +void -target
    TARGET 5 +target
    END
    GEOEND
  • …+…1…+…2…+…3…+…4…+…5…+…6…+…7…

DELTARAY 1E-9 VACUUM @LASTMAT NOPRINT
EMFCUT -1E-09 1.E-7 BLKBODY @LASTREG
*

  • OPTICAL PHOTONS
  • E[eV] = 1.2398 / lambda [um]
  • i.e. E=1eV → lambda = 1.2398um (microns)

OPT-PROD HYDROGEN @LASTMAT TR-RADIA
OPT-PROP 0.5 ALUMINUM METAL
OPT-PROP 3.E-5 5.0E-5 6.E-5 VACUUM 0.WV-LIMIT
OPT-PROP 0 0.0 0 VACUUM 0.
*
ASSIGNMA BLCKHOLE BLKBODY
ASSIGNMA VACUUM VOID
ASSIGNMA ALUMINUM TARGET
USRBIN 10. OPTIPHOT -24 2. 2. 2.Opt_3
USRBIN -2. -2. -2. 40 40 40 &

  • Set the random number seed
    RANDOMIZ 1.
  • Set the number of primary histories to be simulated in the run
    START 1000.
    STOP

Dear Andrei Patapenka,

Unfortunately transition radiation is not implemented in FLUKA. Instead, what’s you saw in FLAIR or on the FLUKA card OPT-PROD is merely a placeholder for a future implementation of this process. You OPT -PROD card has therefore no effect on your simulation.