Dear Zhanglu,
for low-energy neutrons, the correct place of the output file where to look the applied settings is the table named
"Weight Profile for Low Energy Neutrons Groups #”, as per Note 3 of WW-FACTO in the manual.
The value reported in the output file for "Cut-off kinetic energy for WWLOWNEU RR/splitt” do not have a particular meaning for the low-energy neutrons, that are treated by the multi-group technique.
About how to implement the biasing efficiently, I can recommend you to give a look at the slides of the last FLUKA course
https://indico.cern.ch/event/604018/contributions/2435673/attachments/1395461/2242764/13_Biasing_2017.pdf
The last 3 slides in particular describe a recipe to select the WW.
The problem is not simple, as comment in slide 28 of the same presentation: WW "...is more an art than a science” (Quote from the MCNP manual)
Good luck, luigi
On 23 Oct 2017, at 09:43, 张璐 <zhanglu_at_impcas.ac.cn<mailto:zhanglu_at_impcas.ac.cn>> wrote:
Dear FLUKA's user and developer;
I'm now using fluka to do something about the low-energy neutron shielding, but during my work, i can find efficient way to active the weight window for low-energy neutrons by WW-FACTOR.
there is a simple example in the attachment.
In this example, Iused the WW-FACTOR , the WW-THRES (wwlowneu) and a WW-PROFI CARD, but it seems that the RR/SP never happens.
Is there still something absent？ How to active the WW-Factor efficiently？
By the way，in the fluka output， it shows as following：
Cut-off kinetic energy for WWLOWNEU transport: 1.000E-02 GeV
Cut-off kinetic energy for WWLOWNEU RR/splitt: 0.000E+00 - 0.000E+00 GeV , WW ext. width: 1.000E+01, Bot&Top X 1.000E+00
Does above information means the Weight window for low-neutron didn't be actived?
Thank you very much！
<eee1.inp>
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Received on Wed Oct 25 2017 - 13:38:46 CEST