Thanks. It seems I should learn how to use the search function in my PDF reader. Searching on "beta" turns up the same reference you gave that I could not find by manually scanning the manual for an hour.
From: Matthew Rowles [mailto:rowle...@gmail.com] Sent: Thursday, December 19, 2013 3:31 PM To: Allen, Douglas R. Cc: rietveld_l@ill.fr Subject: Re: "N Beta" in TOPAS Full Axial Model From the Tech Ref: [axial_n_beta #20]: Define the number of rays emanating from a point X-ray source in the axial plane. Larger values for axial_n_beta increases both accuracy and calculation time. Looks like Alan is doing some sort of ray tracing to calculate the peak profiles. On 20 December 2013 09:18, Allen, Douglas R. <douglas_al...@fmi.com<mailto:douglas_al...@fmi.com>> wrote: Can anyone tell me the meaning and possible setting for the "N Beta" item in the Full Axial Model on the Instrument Parmeters page of TOPAS. We have always used a setting of 20 but I have no idea why or what it means. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Please do NOT attach files to the whole list <alan.he...@neutronoptics.com<mailto:alan.he...@neutronoptics.com>> Send commands to <lists...@ill.fr<mailto:lists...@ill.fr>> eg: HELP as the subject with no body text The Rietveld_L list archive is on http://www.mail-archive.com/rietveld_l@ill.fr/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Please do NOT attach files to the whole list <alan.he...@neutronoptics.com> Send commands to <lists...@ill.fr> eg: HELP as the subject with no body text The Rietveld_L list archive is on http://www.mail-archive.com/rietveld_l@ill.fr/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
