<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<div class="moz-cite-prefix">Hi Saed,<br>
<br>
you are right the 220 reflection has zero intensity in the Si.laz
file as you can see here<br>
<a class="moz-txt-link-freetext"
href="http://www.mcstas.org/download/components/data/Si.laz">http://www.mcstas.org/download/components/data/Si.laz</a><br>
<br>
I believe that is not correct for the diamond structure of Si (F
-d 3m)<br>
<br>
S_Si(hkl)=S_fcc(hkl)[1+exp(i pi /2)(h+k+l)]<br>
where S_fcc(hkl)=4b_Si for h,k,l all odd or even, else
S_fcc(hkl)=0<br>
<br>
hence<br>
<br>
S_Si(220) = 2 * S_fcc(hkl)= 8 b_Si<br>
<br>
( but S_Si(hkl) = 0 if [h+k+l=2(2n+1)] )<br>
<br>
A solution would be to generate your own reflection list (h,k,l,
Intensity) from e.g. crystallografica and input that as datafile
to the component where you have used Si.laz before. When you have
generated a better reflection list for Si I'm sure the McStas
developers would be happy if you contribute it to the next McStas
distro :)<br>
<br>
Best wishes<br>
Linda<br>
<br>
On 11/22/2017 09:21 AM, 새드하셈 wrote:<br>
</div>
<blockquote type="cite"
cite="mid:20171122082144.14738.jxmail@kaeri.re.kr">
<div style="background-color:#ffffff;">
<style>P {font-size:10pt;font-family:굴림,Gulim,Helvetica,serif;margin-top:7px;margin-bottom:0px;}</style>
<p><br>
Hello everyone, </p>
<p>Here is Mr. Saed Almomani from KAERI, I'm working
on conceptual design of HRPD for the Jordan Research &
Training Reactor JRTR. I'm using McStas software to test and
verify my design, and when I used the Si.laz sample in my
code I found that some of reflection planes are not shown in
the diffraction pattern such as (220) !! then I tried to use
D2B HRPD code (built-in McStas) to test the Si.laz sample and
the problem was the same " the 220 reflection plane was not
shown" !! then I tried to use the Al.laz sample and I got a
perfect diffraction pattern !<br>
So what is the problem and why is that ? is there any error in
the (Si.laz) predefined sample of McStas ? and what is the
best way to solve this problem? </p>
<p> </p>
<p>Thank you in advance <br>
<br>
<br>
</p>
<div id="uSign"> </div>
<br>
<img
src="http://mail.kaeri.re.kr/skina2/img/kaeri_footer_hybrid.jpg"
moz-do-not-send="true"><br>
</div>
<br>
<p><img
src="http://mail.kaeri.re.kr:80/jxmail/ko/jsp/mail/readCheck.jsp?read=saed_send_mime_1511338904171_Thread-1003_0"
moz-do-not-send="true" height="1" border="0" width="1">
<br>
</p>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
mcstas-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:mcstas-users@mcstas.org">mcstas-users@mcstas.org</a>
<a class="moz-txt-link-freetext" href="http://mailman.mcstas.org/cgi-bin/mailman/listinfo/mcstas-users">http://mailman.mcstas.org/cgi-bin/mailman/listinfo/mcstas-users</a>
</pre>
</blockquote>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
----------~oOo~----------
Dr. Linda Udby
Associate Professor
X-ray and Neutron Science
Niels Bohr Institute
University of Copenhagen
tel: +45 23 83 98 77
webpage: <a class="moz-txt-link-abbreviated" href="http://www.e-neutrons.org">www.e-neutrons.org</a>
----------~oOo~----------</pre>
</body>
</html>