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<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'>Hello all,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'>I’m having a little bit of trouble with the
single_crystal component.<span style='mso-spacerun:yes'> </span>I’ve
created a .lau file in Crystallographica to simulate <span class=GramE>an</span>
Si analyzer crystal.<span style='mso-spacerun:yes'> </span>I simply want to
reflect a neutron beam of wavelength 2.866 A using the 311 plane (d = 1.637) of
Si.<span style='mso-spacerun:yes'> </span>So I’ve set up the crystal to
satisfy the Bragg condition, giving theta = 61.823, and thus 2theta =
123.646.<span style='mso-spacerun:yes'> </span>I put a banana shaped detector
around this 2theta, and I get no reflections.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'>Here is the crystal:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'>COMPONENT analyzer = Single_<span class=GramE>crystal(</span><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><span style='mso-spacerun:yes'> </span><span
class=GramE>reflections</span> = "Si.lau", xwidth = 0.1, yheight =
0.1,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><span style='mso-spacerun:yes'> </span><span
class=GramE>zthick</span> = 0.01, delta_d_d = 0, mosaic = 18, order = 0,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><span style='mso-spacerun:yes'> </span>p_transmit
= 0, absorption = 0, incoherent = 0, ax = 5.430530,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><span style='mso-spacerun:yes'> </span><span
class=GramE>by</span> = 5.430530, cz = 5.430530, aa = 90, bb = 90, cc = 90)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><span style='mso-spacerun:yes'> </span>AT (0, 0, 0)
RELATIVE a1<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><span style='mso-spacerun:yes'> </span>ROTATED <span
class=GramE>( 0</span>, theta311, 0) RELATIVE sample_arm<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'>Where theta311 = 61.823 relative to the incident beam.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'>Can any one offer any suggestions as to why this
might not be working?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'>I’ve also attached the Si.lau file.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'>Thanks, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'>Aaron<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-CA style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span lang=EN-CA
style='font-size:10.0pt;font-family:"Courier New";mso-no-proof:yes'>*************************************************</span></font><font
face="Courier New"><span lang=EN-CA style='font-family:"Courier New";
mso-no-proof:yes'><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face="Courier New"><span style='font-size:
10.0pt;font-family:"Courier New";mso-no-proof:yes'>Aaron M. Percival<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 face="Courier New"><span style='font-size:
10.0pt;font-family:"Courier New";mso-no-proof:yes'>M.Sc. Candidate<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span lang=EN-CA
style='font-size:10.0pt;font-family:"Courier New";mso-no-proof:yes'>Dept. of
Physics, Engineering Physics & Astronomy<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span lang=EN-CA
style='font-size:10.0pt;font-family:"Courier New";mso-no-proof:yes'>Queen's
University<o:p></o:p></span></font></p>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=2
face="Courier New"><span lang=EN-CA style='font-size:10.0pt;font-family:"Courier New";
mso-no-proof:yes'>Kingston</span></font></st1:City><font size=2
face="Courier New"><span lang=EN-CA style='font-size:10.0pt;font-family:"Courier New";
mso-no-proof:yes'>, <st1:State w:st="on">Ontario</st1:State>, <st1:country-region
w:st="on">Canada</st1:country-region></span></font></st1:place><font size=2
face="Courier New"><span lang=EN-CA style='font-size:10.0pt;font-family:"Courier New";
mso-no-proof:yes'>, K7L 3N6<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span lang=EN-CA
style='font-size:10.0pt;font-family:"Courier New";mso-no-proof:yes'>Office:
613-533-6000 ext. 74789<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span lang=EN-CA
style='font-size:10.0pt;font-family:"Courier New";mso-no-proof:yes'>Fax:
613-533-6463<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Courier New"><span lang=EN-CA
style='font-size:10.0pt;font-family:"Courier New";mso-no-proof:yes'>*************************************************<o:p></o:p></span></font></p>
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style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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