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Constant-Field QED, i.e., the beamstrahlung and coherent pair creation.
Both the effects of the beam field and the external field are
included. The angular distribution of the final particles
is not included.
When the polarization flag (see below) is on, all the
polarization effects (longitudinal and transverse spin of electron/positron
and linear and circular polarization of photon) are included.
CFQED
BEAMSTRAHLUNGPAIRCREATION[,]
[POLARIZATION,]
[PMAX=,]
[WENHANCE=,] ;
- BEAMSTRAHLUNGPAIRCREATION
-
Specifies which parameters to define here.
Only one of these may be specified by one
CFQED command.
- POLARIZATION
- Flag to take into account all the
polarization effect. (default=No). Note that
the flag SPIN (FLAG command) must also
be on for polarization calculation.
-
- Maximum probability of events per one time
step. (Default=0.1). When the probability exceeds
, CAIN stops with a message.
-
- Enhancement factor of radiation rate. .
When (default), macro-photons are created
such that
When (<1), macro-photons are created more
(less) by the factor , each having less (more)
weight. When , no photon is created (but
the recoil of electron is taken into account.)
This operand is introduced in order to
avoid poor statistics due to too less macro-photons or memory
overflow due to too many macro-photons.
See Sec.5.8 and Sec.5.9 for the formulas
and algorithm and for more detail on the enhancement factor.
Toshiaki Tauchi
Thu Dec 3 17:27:26 JST 1998