CAIN normally produces macro-photons such that the expected number of
macro-photons per macro-electron is equal to the expected number of
real photons per real electron. In some cases, however, too many macro-photons
are created causing the memory overflow, or the statistics is too poor
due to a small number of macro-photons. To solve this problem, a variable
WENHANCEMENT=
is introduced in the CFQED command.
When 
, more macro-photons are created. They have the weight
smaller than that of the parent electron/positron by the factor 1/.
However, the recoil of electron/positron is taken into account only
with the probability 1/ so that their statistical property does
not depend on .
When 
, the event generation goes the same as in the case
=1, but the final photons are stored in the memory only with
the probability . The recoil of electron/positron is taken
into acount regardless the photon is stored or not.
Thus, if there is no bug, does not cause any physical change.