LP_factor

btrump1

I'm curious, I've been using the Topas wiki a lot recently, and I noticed that it claims LP_factor should be 90 for unpolarized (standard X-ray) sources and 0 for polarized (such as synchrotron) sources. However, the Argonne 11-BM standard Topas *.inp file seems to use 90 even though it is a synchrotron source. Also, Topas Commercial seems to claim 0 for polarized and 90 for unpolarized.

Which is right?

Thanks!
-Ben
Ph.D. Candidate
McQueen Lab
Department of Chemistry
Department of Physics and Astronomy
Institute of Quantum Matter

alancoelho

Try the PDF file at http://topas.dur.ac.uk/topaswiki/doku.php?id=lorentz_and_polarisation_factors

btrump1

Thanks! That *.pdf make sense and seems to follow what I thought the answer should be. However, it appears that the Topas wiki (manual_part_2 under Intensity corrections) has this backwards. It appears I cannot edit this even though I have an account. Who do I need to contact to have this fixed?

johnsoevans

The manual part of the wiki is a snapshot of the "official" topas manual. I therefore left it as non-edit. The best thing is to put any corrections elsewhere on the wiki.