From: Francesco Cerutti (Francesco.Cerutti@cern.ch)
Date: Fri Jan 18 2008 - 01:12:29 CET
Dear Jeff,
you might benefit from biasing.
To increase the efficiency of bremsstrahlung photon production, you can
reduce the interaction mean free path for electron bremsstrahlung in your
target (EMF-BIAS card with SDUM = LAMBBREM).
Moreover, to get rid of electrons escaping the target, you can assign
lower importance to regions downstream from the target, for electrons
only. In order to do this, you need to include few BIASING cards. With
WHAT(1)=2.0 and WHAT(2)=0.0 you can set a reduced importance for the
mentioned regions (regions not indicated will have a default importance
equal to 1.0). With WHAT(1)<0.0 and WHAT(2)=0.0 you can switch off
importance biasing for particles other than electrons. Please refer to the
manual for more biasing details.
As you pointed out, increasing the transport threshold in vacuum regions
is not effective, since there electrons cannot stop and deposit their
energy.
Hope this helps
Best regards
Francesco
**************************************************
Francesco Cerutti
CERN-AB
CH-1211 Geneva 23
Switzerland
tel. ++41 22 7678962
fax ++41 22 7668854
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