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<P style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><SPAN lang="EN-US"><FONT face="Times New Roman">Hi all,</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><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 style="FONT-FAMILY: 宋体" lang="EN-US">5</SPAN><SPAN style="FONT-FAMILY: 宋体">°<SPAN lang="EN-US">in figure 1 (radius=<st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="10" UnitName="mm" w:st="on">10mm,in enclosure</st1:chmetcnv>) vanishes in figure 2 (radius=<st1:chmetcnv TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="2" UnitName="mm" w:st="on">2mm</st1:chmetcnv>) 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></P>
<P style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><SPAN style="FONT-FAMILY: 宋体"><SPAN lang="EN-US"><SPAN style="FONT-FAMILY: 宋体; FONT-SIZE: 10.5pt; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US"><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f"><v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"></v:path><o:lock v:ext="edit" aspectratio="t"></o:lock></v:shapetype></SPAN></SPAN></SPAN> <IMG style="WIDTH: 350px; HEIGHT: 234px" src="cid:2beeb04$8$13ee5681df4$Coremail$wokaoyan1981$126.com" width="547" height="352" orgWidth="612" orgHeight="460"><IMG style="WIDTH: 417px; HEIGHT: 235px" src="cid:44375504$9$13ee5681df4$Coremail$wokaoyan1981$126.com" width="527" height="382" orgWidth="625" orgHeight="455"></P>
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<P style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><SPAN style="FONT-FAMILY: 宋体" lang="EN-US">The other question is that we can find dozens of small peaks besides the diffraction peaks(See banana.th file).What are they? The background?<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><SPAN style="FONT-FAMILY: 宋体" lang="EN-US">The Ncount=10E8 and nrepeat=1000.<o:p></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><SPAN lang="EN-US"><FONT face="Times New Roman">I’m looking forward your reply. Thank you.</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><SPAN lang="EN-US"><o:p><FONT face="Times New Roman"> </FONT></o:p></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><SPAN lang="EN-US"><FONT face="Times New Roman">Best wishes,</FONT></SPAN></P>
<P style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><SPAN lang="EN-US"><FONT face="Times New Roman">Tom</FONT></SPAN></P>
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