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<div style="word-wrap:break-word">Hi Tom,
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<div>Is it correctly understood that your first instrument is run with 1e8 neutrons? - Doing so gives me only ~ 8000 neutrons in the virtual output file, which in any case is a very low number. As a rule of thumb, I would never go below ~ 1e5-1e6 events in
a virtual input/output file, you risk imposing bias on your results because of the poor statistics. </div>
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<div>I the attached, I have improved on your instrument files</div>
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<div>pdc1:</div>
<div>* To follow loss of the neutrons through the instrument, I have added various PSD's and wavelength-monitors.</div>
<div>* The bandwidth of a Monochromator Bragg reflection is a few percent - so simulating the full range of 1-2 Å kills a lot of your neutrons. I suggest using [1.57 1.63] - then 1e8 neutrons produces ~ 135000 events in your virtual_output file</div>
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<div>pdc2:</div>
<div>* Using both a SPLIT and repeat_count is meaningless - they do the same, namely repeat incoming neutrons. This means that you repeated your 8000 neutrons above 10000 times each. I would rather look at the number of reflections in your Fe.laz and use that
number as an over bound on the repetition ~ 50.</div>
<div>* I have used the d_phi parameter of PowderN to restrict the Debye-Scherer cones to what the detector sees (180*atan(30/120)/PI ~ 14 degrees - have made it 30 for safety. </div>
<div>* I have put frac and tfrac parameters of PowderN to zero, thereby suppressing incoherent scattering and description of the "direct beam".</div>
<div>* I have added another banana-shaped detector BEFORE the radial collimator, with restore_neutron=1.</div>
<div>* I have added the input parameter Div that parametrizes the collimator divergence.</div>
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<div>The added banana-shaped detector shows that your radial collimator is what suppresses the peak, see attached graphics for the r=2 mm sample case</div>
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<div>My feeling is that 12 minutes of arch becomes much to restrictive when you are studying the small sample - the natural divergence from the 4 mm wide sample is 180*atan(0.4/120)/PI ~ around 11 minutes of arch, which is around what your collimator accepts,
so only the strongest reflections stand a chance.</div>
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<div>Hope this helps,</div>
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<div>Peter</div>
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<div>On May 27, 2013, at 11:53 , 闄堝溅鑸?<<a href="mailto:wokaoyan1981@126.com">wokaoyan1981@126.com</a>> wrote:</div>
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<div style="margin:0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">Hi all,</font></span></div>
<div style="margin:0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">I am conducting a virtual experiment by McStas. The sample is a column-shaped alpha-Fe. I change the radius of it and compare the diffraction patterns. The diffraction patterns
change along with the varied radius value. For example the peak around 8</font></span><span lang="EN-US" style="font-family:瀹嬩綋">5</span><span style="font-family:瀹嬩綋">掳<span lang="EN-US">in figure 1 (radius=10mm,in enclosure) vanishes in figure 2 (radius=2mm)
while other diffraction peaks are still visible. This phenomenon is not expected.You may have a look at the pdc1.instr and pdc2.instr in enclosure.</span></span></div>
<div style="margin:0cm 0cm 0pt"><span style="font-family:瀹嬩綋"><span lang="EN-US"></span></span> <span><radius2mm.JPG></span><span><radius10mm.JPG></span></div>
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<div style="margin:0cm 0cm 0pt"><span lang="EN-US" style="font-family:瀹嬩綋">The other question is that we can find dozens of small peaks besides the diffraction peaks(See
<a href="http://banana.th">banana.th</a> file).What are they? The background?</span></div>
<div style="margin:0cm 0cm 0pt"><span lang="EN-US" style="font-family:瀹嬩綋">The Ncount=10E8 and nrepeat=1000.</span></div>
<div style="margin:0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">I鈥檓 looking forward your reply. Thank you.</font></span></div>
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<div style="margin:0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">Best wishes,</font></span></div>
<div style="margin:0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">Tom</font></span></div>
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