[mcstas-users] sigma_inc issue

[Peter Kjær Willendrup]

Hi Tom,

In McDoc -> component library index you can find the short documentation for every McStas component, including PowderN. (Also available here: http://mcstas.org/download/components/samples/PowderN.html - from McStas 2.0).

A quick look at the table in that documentation will reveal the 'frac' parameter in McStas 1.12c or the 'p_inc' parameter in McStas 2.0, which should be used to assign at fraction of your statistics to scatter incoherently.

Best,

Peter

Technical University of Denmark



Department of Physics
Neutrons and X-rays for Materials Physics
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Den 28/04/2013 kl. 04.44 skrev "陈彦舟" <wokaoyan1981 at 126.com<mailto:wokaoyan1981 at 126.com>>:

Hi all,
  I set the parameter “sigma_inc” of  PowderN component as 0.4, but no platform background is found!
  Then I set it much more larger as 400 on purpose, no platform background is found either ( In this case, more peaks are observed.)

  Could you please shed light on it?

  SPLIT 10 COMPONENT sample = PowderN(
   reflections = "Fe.laz", radius = 0.005,
   yheight = 0.1, Vc = 23.55, sigma_abs = 2.56, sigma_inc = 0.4)
 AT (0, 0, 0.05) RELATIVE virtual_out

Best wishes,
Tom








<sigma_inc400.bmp>
<ATT00001.c>
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