Date: Fri, 4 Jun 2010 16:46:32 +0100
Dear Fluka Experts,
I have found an issue with FLAIR that has resulted in me modelling a
rectangular beam when I thought I was modelling a Gaussian beam.
I think the best way to describe it is by looking at the attached snap
shot of the Flair screen.
You can see that I have selected Gauss, hence why I thought I had a
Gaussian beam but on closer inspection in the BEAM card you can see that
what(5) is positive. IF what 5 is positive that means the value is the
width of a rectangular beam instead of the FWHM of a Gaussian profile
that I was expecting! Interestingly what(4) is negative so am I
modelling a beam that is Gaussian in x and rectangular in y? Anyway it
seems if I select rectangular and then Gauss again the problem goes
away. However I wasn't expecting to have to do that so I have modelled
several cases where I thought the beam was Gaussian but the results
showed that not to be the case.
Thanks
Tristan
Tristan Davenne BEng PhD CEng MIMechE
STFC Technology
G19 R65
Rutherford Appleton Laboratory
Chilton, Didcot, Oxfordshire OX11 0QX, UK
Tel: +44 (0)1235 445485
Email: tristan.davenne_at_stfc.ac.uk <mailto:t.r.davenne_at_rl.ac.uk>
