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<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D">Dear All,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><i><u><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D">Please ignore if you are not interested in imperfect crystal (monochromators, analysers etc) computations.<o:p></o:p></span></u></i></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D">I am sending a report written on the calculation of mosaic / bent / gradient crystal calculations a long time ago. This was part of a PhD thesis project – like the
paper you discussed in this thread: </span><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D">J Appl Crys 37 732+ (<a href="http://dx.doi.org/10.1107/S0021889804015390"><span style="color:#1F497D">http://dx.doi.org/10.1107/S0021889804015390</span></a>)</span><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D">The reflectivity code is included at the end of the report – unfortunately I could not find the Fortran version in my old files – but I’m sure it should be possible
to translate the code easily into any other language if of interest.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D">Feel free to send feedback<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D">Lucia<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Cambria","serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Cambria","serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-GB">Lucia Alianelli<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-GB">Senior Optics Scientist<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-GB">Diamond Light Source Ltd<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt;font-family:"Cambria","serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> mcstas-users [mailto:mcstas-users-bounces@mcstas.org]
<b>On Behalf Of </b>????<br>
<b>Sent:</b> 11 May 2018 10:36<br>
<b>To:</b> IversonErikB.; pkwi@; saed@<br>
<b>Cc:</b> mcstas-users@mcstas.org<br>
<b>Subject:</b> Re: [mcstas-users] Reflectivity and transmission files of Ge crystal<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p style="background:white">Dear Prof. Erik <o:p></o:p></p>
<p style="background:white">Thank you for your reply and for these valuable comments, I really appreciate it<o:p></o:p></p>
<p style="background:white"> <o:p></o:p></p>
<p style="background:white">Let me start from point #3 and 4 first;<o:p></o:p></p>
<p style="background:white">HANARO-HRPD is installed on thermal beam tube with Maxwellian spectrum, where the capture flux and particle flux are equal by definition as I know. And the input Temp in my code is 37 degree not kelvin and the code will change it
to 310 K while running, <o:p></o:p></p>
<p style="background:white">Point #2; I have checked the link that you sent, but the research paper investigates the peak reflectivity for (Ge 311) which has high integrated reflectivity comparing to (Ge 331) that used in HANARO-HRPD, so I think I shall not
use a peak reflectivity of 0.5 ~ 0.6 for 1.836 AA for (Ge 331), are you agree with me or there is something I miss?
<o:p></o:p></p>
<p style="background:white"> <o:p></o:p></p>
<p style="background:white"><strong><span style="font-family:"Gulim","sans-serif"">Point #1: </span></strong>I tried to find some data about the wavelength spread of Ge monochromator at HANARO-HRPD but unfortunately I couldn't find! <o:p></o:p></p>
<p style="background:white"><strong><span style="font-family:"Gulim","sans-serif"">But
</span></strong>I'm wondering about this point , therefore <strong><span style="font-family:"Gulim","sans-serif"">let's assume
</span></strong>that the measured wavelength spread is much larger than the calculated one by McStas, so what's next ? <br>
The wavelength spread is governed mainly by mosaicity of Monochromator, so in order to match the calculated wavelength spread (McStas) with the measured one I have to change the mosaic angle in McStas code which is a characteristic property of Mononchromator
that should not be changed at all, am I wrong?! <o:p></o:p></p>
<p style="background:white">I wonder if there is another way to match them without changing the parameters of Monochromator.<o:p></o:p></p>
<p style="background:white"> <o:p></o:p></p>
<p style="background:white">Thank you again for your efforts and looking forward to your response<o:p></o:p></p>
<p style="background:white">Best Regards<o:p></o:p></p>
<p style="background:white">Saed Almomani <o:p></o:p></p>
<p class="MsoNormal" style="background:white"><br>
<span style="border:solid windowtext 1.0pt;padding:0cm"><img border="0" width="100" height="100" id="_x0000_i1025" src="cid:~WRD000.jpg" alt="Image removed by sender."></span><br>
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<br>
-----Original Message-----<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt;background:white"><b><span lang="KO">보낸사람</span>(From) :</b> Iverson Erik B. <iversoneb@ornl.gov><br>
<b><span lang="KO">받는사람</span>(To) :</b> pkwi@fysik.dtu.dk <pkwi@fysik.dtu.dk>;saed@kaeri.re.kr <saed@kaeri.re.kr><br>
<b><span lang="KO">참조</span>(Cc) :</b> Iverson Erik B. <iversoneb@ornl.gov>;mcstas-users@mcstas.org <mcstas-users@mcstas.org><br>
<b><span lang="KO">보낸일자</span>(Sent) :</b> 2018-05-10 22:32:03<br>
<b><span lang="KO">메일제목</span>(Subject) :</b> Re: [mcstas-users] Reflectivity and transmission files of Ge crystal<br>
<br>
<o:p></o:p></p>
<div>
<p class="MsoNormal" style="background:white">Dear Saed,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white">At first glance, I think there are four things for you to check. You say that your value at the monochromator is what you expect, but the sample is down by a factor of eight - as you indicated earlier, this definitely
suggests issues with the monochromator (germanium) modeling. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white">1) Your measured flux on sample is 1.3E6 n/cm2/s at 1.836 AA. This is a little bit incomplete for diagnostic purposes- what is the wavelength spread? What is the divergence? If you can compare those bounds to that
produced by the calculation, you may find something informative. For example, it may be that your measured wavelength spread is larger than your modeled spread, and thus the calculation is missing something.
<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white">2) You use a reflectivity of 0.3 in the model (for 1.836 AA off of 331). While that will depend significantly on the thickness of the crystal as well as other factors, that seems low to me. Look at J Appl Crys 37
732+ (<a href="http://dx.doi.org/10.1107/S0021889804015390">http://dx.doi.org/10.1107/S0021889804015390</a>). There, they report peak reflectivity measurements of order 0.5 to 0.6, with a reflectivity FWHM half again larger than the intrinsic mosaic.
<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white">While not related to the monochromator per se, it is also worth asking:
<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white">3) Just to be paranoid - you quote a flux integral of 2.7E8 at the monochromator position - is that particle flux or capture flux? You're on a cold source (at least the Maxwellian temperature of 37 suggests that),
so the capture flux is numerically significantly higher than the particle flux integral. You've almost certainly got the right value - but it's easy enough to check that I claim it's worth checking. (The same would technically apply to the beam tube flux of
1.28E14 - if that's a measured capture flux, it's a specific factor higher than the particle flux, and that same factor would apply at the monochromator position.)
<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white">4) Most complicated - hydrogen cold sources don't necessarily have a spectrum well fit by a Maxwellian, and your sample flux really only runs just around that one wavelength. It's easy for the integral to match
with the value at one wavelength to be significantly different. Are there spectral measurements that support a 37-K Maxwellian?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
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<p class="MsoNormal" style="background:white">Good luck, <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white">Erik<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white">On Thu, 2018-05-10 at 16:43 +0900, <span lang="KO">
새드하셈</span> wrote:<o:p></o:p></p>
</div>
<blockquote style="border:none;border-left:solid #729FCF 1.5pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<p style="background:white">Dear Dr. Peter <o:p></o:p></p>
<p style="background:white">First of all thank you so much for your quick response, I appreciate your help and effort
<o:p></o:p></p>
<p style="background:white"> <o:p></o:p></p>
<p style="background:white">Regarding your request, you can find the attached file of my McStas code for the HANARO-HRPD with this email.
<o:p></o:p></p>
<p style="background:white">I would like to mention that I wrote almost all required descriptions and information as comments inside the code itself.<br>
I'm sure that you can follow the design without any conflict. But in case you need more information I will response quickly.
<o:p></o:p></p>
<p style="background:white"> <o:p></o:p></p>
<p style="margin-bottom:12.0pt;background:white">Thank you in advance for your efforts and cooperation<o:p></o:p></p>
<div id="uSign">
<p class="MsoNormal" style="background:white"> <o:p></o:p></p>
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<p class="MsoNormal" style="background:white"><br>
<span style="border:solid windowtext 1.0pt;padding:0cm"><img border="0" width="100" height="100" id="_x0000_i1026" src="cid:~WRD000.jpg" alt="Image removed by sender."></span><br>
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<br>
-----Original Message-----<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal" style="background:white"><b><span lang="KO">보낸사람</span>(From) :</b> Peter Kjær Willendrup <pkwi@fysik.dtu.dk><br>
<b><span lang="KO">받는사람</span>(To) :</b> <span lang="KO">새드하셈</span> <saed@kaeri.re.kr><br>
<b><span lang="KO">참조</span>(Cc) :</b> mcstas-users@mcstas.org <mcstas-users@mcstas.org><br>
<b><span lang="KO">보낸일자</span>(Sent) :</b> 2018-05-09 22:56:02<br>
<b><span lang="KO">메일제목</span>(Subject) :</b> Re: [mcstas-users] Reflectivity and transmission files of Ge crystal<br>
<br>
<br>
Dear Saed,<o:p></o:p></p>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><br>
<br>
<o:p></o:p></p>
<div>
<p class="MsoNormal" style="background:white">On 9 May 2018, at 11:30 , <span lang="KO">
새드하셈</span> <<a href="mailto:saed@kaeri.re.kr">saed@kaeri.re.kr</a>> wrote:<o:p></o:p></p>
</div>
<div>
<div>
<p style="background:white">Actually I have one question and one inquiry:<o:p></o:p></p>
<p style="background:white"><strong><span style="font-family:"Gulim","sans-serif"">Q:</span></strong><span class="apple-converted-space"><b> </b></span>I'm trying to simulate the HANARO_HRPD by using McStas software. <strong><span style="font-family:"Gulim","sans-serif"">But
after I inserted all required components and their parameters as designed/as they are on ground now</span></strong>, I found a kind of<span class="apple-converted-space"> </span><strong><span style="font-family:"Gulim","sans-serif"">difference</span></strong><span class="apple-converted-space"> </span>between
the McStas_flux magnitude and the Real_flux magnitude both at sample position in (n/cm2.s) !! and the difference is high enough to say there is something wrong I can't figure it ! {Real_flux is around (1.3e6) n/cm2.s where McStas_flux is (1.9e5) n/cm2.s.}
although I get almost exact matching result at monochromator position.<span class="apple-converted-space"> </span><o:p></o:p></p>
</div>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white">It is always easier to comment or correct if there is acces to the instrument file, as well as other necessary data.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white">I would therefor encourage you to send the instrument file, plus descriptive material about your beamline in response to this email.<o:p></o:p></p>
</div>
<p class="MsoNormal" style="background:white"><br>
<br>
<o:p></o:p></p>
<div>
<div>
<p style="background:white">And my concerns also increased when some experts (2 experts to be honest) told me that McStas doesn't show the flux magnitude as calculated or expected !! So is this True ?! and if yes, what is the accepted difference between McStas
and Real, i.e. the criteria or error margin to consider?<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal" style="background:white"><br>
I my experience McStas is reasonably reliable, and to a large extent simulates exactly what one parametrises. This of course means that if the source emission or certain material- or geometrical data are put in with values that are off, the simulation will
naturally also be off. :-)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="background:white">A rule of thumb is that with modest effort, one can arrive within 10% of what one would measure. Better agreement than that typically requires lots of more thinking, coding, simulating and benchmarking.<o:p></o:p></p>
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<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="background:white">But again, without access to what you are trying to simulate and how, it is hard to judge what is going on. We are "flying blind".<br>
<br>
<br>
<o:p></o:p></p>
<div>
<div>
<p style="background:white"><strong><span style="font-family:"Gulim","sans-serif"">Inquiry:</span></strong><span class="apple-converted-space"> </span>I tried to get the Reflectivity files of Ge crystal to define a curved Monochromator with four wavelengths
(1.54, 1.834, 1.866, 2.224 A), but unfortunately I couldn't find any source that provide a tabulated data of the wavelength and the absolute Ge crystal reflectivity. So is there anyone who could help me in this also?<span class="apple-converted-space"> </span><o:p></o:p></p>
</div>
</div>
</div>
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<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
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<div>
<p class="MsoNormal" style="background:white">I must admit I am not much of a monochromator-expert, but I would try looking among papers by Freund et. al from the 1970’s and 80’s.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white">Best regards,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal" style="background:white">Peter Willendrup<o:p></o:p></p>
</div>
<p class="MsoNormal" style="background:white"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Peter Kjær Willendrup<o:p></o:p></span></b></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#9B9B9B">Forskningsingeniør, Speciakonsulent<br>
Næstformand for DTU Fysik LSU<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Technical University of Denmark</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Department o</span><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1F497D">f</span><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black"> Physics</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Fysikvej</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Building 307</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">DK-2800 Kongens Lyngby</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Direct +45 2125 4612</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Mobil +45 2125 4612</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:black">Fax +45 4593 2399</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""><o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span class="apple-style-span"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif";color:black"><a href="mailto:pkwi@fysik.dtu.dk">pkwi@fysik.dtu.dk</a>
</span></span><o:p></o:p></p>
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<pre style="background:white">_______________________________________________<o:p></o:p></pre>
<pre style="background:white">mcstas-users mailing list<o:p></o:p></pre>
<pre style="background:white"><a href="mailto:mcstas-users@mcstas.org">mcstas-users@mcstas.org</a><o:p></o:p></pre>
<pre style="background:white"><a href="https://mailman2.mcstas.org/mailman/listinfo/mcstas-users">https://mailman2.mcstas.org/mailman/listinfo/mcstas-users</a><o:p></o:p></pre>
</blockquote>
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<pre style="background:white">-- <o:p></o:p></pre>
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<p class="MsoNormal" style="background:white"><span style="font-family:"Courier New"">Erik B. Iverson, PhD. Spallation Neutron Source<br>
Building 8600, MS6466 1 (865) 241-6970<br>
Oak Ridge National Laboratory 1 (865) 574-4140 (FAX)<br>
Oak Ridge, TN 37831 </span><a href="mailto:iversoneb@ornl.gov"><span style="font-family:"Courier New"">iversoneb@ornl.gov</span></a><o:p></o:p></p>
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<p align="justify">-- </p>
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