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<div>Hi again,</div>
<div><br>
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<div>Agreed, this is a good tip. Perhaps implemented as instrument input parameters Lmin and Lmax so that the range is variable (to be able to study if anything unwanted makes it through your complex chopper arrangement...).</div>
<div><br>
</div>
<div>Another few tips:</div>
<div><br>
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<div>You can find parameters for the HZB sources in Source_gen - see <a href="http://www.mcstas.org/download/components/sources/Source_gen.pure.html">http://www.mcstas.org/download/components/sources/Source_gen.html</a></div>
<div>- That should take you closer to the intensities that you will measure at the ESS test beam line.</div>
<div><br>
</div>
<div>As I understood you will likely soon add a sample description? In that case a SPLIT right before the sample position will boost your final detector statistics. Single_crystal and PowderN provide "guesses" at good SPLIT numbers, for other samples you will
currently have to make a good guess yourself. :-)</div>
<div><br>
</div>
<div>As far as I know the instrument is running a prototype of the DAQ and reduction software to be used at ESS? In that case you could at some point consider implementing Mantid event monitors, see <a href="https://github.com/McStasMcXtrace/McCode/wiki/McStas-and-Mantid">https://github.com/McStasMcXtrace/McCode/wiki/McStas-and-Mantid</a></div>
<div><br>
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<div>Best and good luck simulating,</div>
<div><br>
</div>
<div>Peter</div>
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<div><br>
Den 14. dec. 2016 kl. 07.22 skrev Kim Lefmann <<a href="mailto:lefmann@nbi.ku.dk">lefmann@nbi.ku.dk</a>>:<br>
<br>
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<blockquote type="cite">
<div>
<div class="moz-cite-prefix">Dear Alaa,<br>
<br>
A quick read through the modified code tells me that you can use a much smaller energy interval from the source (I take that you like to produce a monochromatic pulse eventually?). This will speed up your simulations a factor > 10.<br>
<br>
best, Kim<br>
<br>
<br>
On 12/13/2016 11:08 AM, Peter Kjær Willendrup wrote:<br>
</div>
<blockquote cite="mid:380424CE-1F0C-4B67-A42A-75A9C9EA944C@fysik.dtu.dk" type="cite">
<div class="" style="word-wrap:break-word">Dear Alaa,
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">Thank you for your email - I had a quick look at your instrument file and made some adjustments - see attached.</div>
<div class=""><br class="">
</div>
<div class="">1) I Assume that in cases where your DiskChoppers are AT the same place they make up an “assembly” or GROUP? In these cases you should also</div>
<div class=""><span class="x_Apple-tab-span" style="white-space:pre"></span>- Include the first of these choppers in the GROUP also - done in the attached</div>
<div class=""><span class="x_Apple-tab-span" style="white-space:pre"></span>- For each individual chopper assembly, there has to be a unique GROUP name, hence I created in total 5 GROUPS</div>
<div class=""><br class="">
</div>
<div class="">2) Are BC_1 and BC_2 maybe meant to be counter-rotating? In that case I think you are missing a sign-change on the frequency parameter of one of them?</div>
<div class=""><br class="">
</div>
<div class="">3) I added a new input parameter Chopper_in that via the WHEN keyword can disable all of the choppers beyond the first counter-rotating set.</div>
<div class=""><span class="x_Apple-tab-span" style="white-space:pre"></span>- I also had to put a “dummy” arm component pr. chopper group to make sure there is a SCATTER when the group is deactivated by the WHEN.</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">We are now in the situation that neutrons are transported both when the choppers are in and out - further optimisation quite likely necessary (only 8 rays out of 1e7 makes it to the sample when choppers are in…), but this at least gives you a
way forward. :-)</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">Hope this helps, and good luck moving further. </div>
<div class=""><br class="">
</div>
<div class="">Best,</div>
<div class=""><br class="">
</div>
<div class="">Peter Willendrup</div>
<div class=""><br class="">
</div>
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<div class="">On 13 Dec 2016, at 10:16 , Ala'a Al-Falahat <<a moz-do-not-send="true" href="mailto:alaa.falahat@gmail.com" class="">alaa.falahat@gmail.com</a>> wrote:</div>
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<div class="x_gmail_default">Dear users,</div>
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<div class="x_gmail_default">I have started to simulate the ESS Test Beam Line at HZB center (please find the attached files to show the instrument in details).</div>
<div class="x_gmail_default">I have generated proper code for it (see instrument file attached below) but I get a warning message that no neutron could reach to some component when I try to get a result, </div>
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</font></div>
<div class="x_gmail_default"><font class="" face="arial, helvetica, sans-serif">Hopefully, you can find a solution on that.</font></div>
<div class="x_gmail_default"><font class="" face="arial, helvetica, sans-serif">For more information don't hesitate to contact me.</font></div>
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</font></div>
<div class="x_gmail_default"><font class="" face="arial, helvetica, sans-serif"><font class="" color="#ff0000">The first attached
</font>you should find at the page number 2 the whole instrument. </font></div>
<div class="x_gmail_default"><font class="" face="arial, helvetica, sans-serif"><font class="" color="#ff0000">The second attached</font> in appendix A , you should find the instrument in details.</font></div>
<div class="x_gmail_default"><font class="" face="arial, helvetica, sans-serif"><font class="" color="#ff0000">The third attached</font> you will find the instrument file I did. </font></div>
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<div class="x_gmail_default" style="font-family:arial,helvetica,sans-serif">with many wishes </div>
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<p class=""><span class="" style="background-color:rgb(255,255,255)"><font class="" color="#9fc5e8">---------------------------------------------------------------------------------------------------------------------------</font></span></p>
<p class=""><font class="" size="2" color="#76a5af"><b class="" style="background-color:rgb(255,255,255)">Institute of Applied Materials<br class="">
Helmholtz-Zentrum Berlin for Materials and Energy<br class="">
Hahn-Meitner-Platz , 1<br class="">
14109 Berlin<br class="">
Germany</b></font><br class="">
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<span id="x_cid:55C9A105-AD43-4631-BF69-6F7AEC42C61B@fysik.dtu.dk"><(First attached)The wavelength frame multiplication chopper system for the ESS test beamline at the BER II reactor.pdf></span><span id="x_cid:158B94C3-AA87-4B63-8EC9-FF03D929EF09@fysik.dtu.dk"><(second
attached)The test beamline of the European Spallation Source – Instrumentation.pdf></span><span id="x_cid:0B4107BC-A139-456F-A82C-FCB2ECF16746@fysik.dtu.dk"><V20TestBeamLineV2.instr></span>_______________________________________________<br class="">
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