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<p>Hello Lingan</p>
<p>you should add dimensions to the Monitor_nD, e.g:</p>
<ul>
<li>Monitor_nD(xwidth=1, height=1, ...)<br>
</li>
</ul>
<p>Regarding the user1 value, as your guide section is very short
(l=0.3 m), the nbounce value will be 0 or 1. The monitor will
record the intensity vs nbounce, which does not brin much
information after all. Usually, one plots the nbounce vs
wavelength to get the transmission, e.g.:</p>
<ul>
<li>Monitor_nD(xwidth=1, height=1, options="signal=user1, lambda
limits=[0 20]", bins=210)</li>
</ul>
<p>Emmanuel.<br>
</p>
<div class="moz-cite-prefix">On 2/13/19 2:57 AM, Lingnan Shen wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAFfmUqnNvaZsWKtU=PLVV=i91J0QmtKApNxwV6K7-Q=ujNgf5A@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div dir="ltr">Hi all,</div>
<div dir="ltr"><br>
<div> I am interested in how many reflection happened
with one guide_gravity component. I am able to printf() the
number of bounces (<i>nbounces</i>) in the EXTEND section
after the guide_gravity. But the monitor_nD component is not
giving any data. It outputs only zeros. And on the
"variables" line in the output file it shows "I I_err N"</div>
<div><br>
</div>
<div> <b> COMPONENT UserMonitor = Monitor_nD(</b></div>
<div><b><span style="white-space:pre"> </span>user1 =
nbounces,</b></div>
<div><b><span style="white-space:pre"> </span>username1 =
"Number of bounces",</b></div>
<div><b><span style="white-space:pre"> </span>options = "auto
user1")</b></div>
<div><b> AT(......)</b></div>
<div><b><br>
</b></div>
<div><b> </b> How should I use the Monitor_nD component
for displaying the number of bounces in the guide?</div>
<div><br>
</div>
<div>Sincerely,</div>
<div>Lingnan Shen</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, Feb 9, 2019 at 5:44 PM
Markus Appel <<a
href="mailto:masolomaster3000@googlemail.com"
moz-do-not-send="true">masolomaster3000@googlemail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi,<br>
"it didn't work" is kind of a vague error to work with, but on
first<br>
glance your problem might be that the nbounces variable is not
reset in<br>
the TRACE section, it will just keep counting up through the
simulation.<br>
<br>
Check again the example in the manual, there is an Arm
component before<br>
the guide with an EXTEND that sets nbounces=0 for each
iteration.<br>
<br>
Best,<br>
Markus<br>
<br>
On 09/02/2019 22:56, Lingnan Shen wrote:<br>
> Hi all,<br>
> <br>
> I now have my reflectivity file working and I'm
trying to<br>
> understand how many reflections happened in the guide. I
followed the<br>
> example in the component manual in the end of section
9.8.7. It didn't<br>
> work. I attached the .instr and .rfl file to this email.<br>
> Thanks for all the great help.<br>
> <br>
> Sincerely,<br>
> Lingnan Shen<br>
> <br>
> On Sat, Feb 9, 2019 at 2:42 AM Kim Lefmann <<a
href="mailto:lefmann@nbi.ku.dk" target="_blank"
moz-do-not-send="true">lefmann@nbi.ku.dk</a><br>
> <mailto:<a href="mailto:lefmann@nbi.ku.dk"
target="_blank" moz-do-not-send="true">lefmann@nbi.ku.dk</a>>>
wrote:<br>
> <br>
> Hi Shen,<br>
> <br>
> It is also my understanding that the k value is the
momentum transfer.<br>
> <br>
> Sorry, I do not have the time to look into you
problem now.<br>
> <br>
> best, Kim<br>
> <br>
> <br>
> On 2/7/19 4:53 PM, <a
href="mailto:ls8vm@virginia.edu" target="_blank"
moz-do-not-send="true">ls8vm@virginia.edu</a> <mailto:<a
href="mailto:ls8vm@virginia.edu" target="_blank"
moz-do-not-send="true">ls8vm@virginia.edu</a>> wrote:<br>
>><br>
>> Hi all,____<br>
>><br>
>> __ __<br>
>><br>
>> I checked the supermirror_m3.rfl file
and it ranges<br>
>> from 0 to 0.09 [Angs-1] so I’m really confused
with the k value in<br>
>> the first column of reflectivity file. I thought
it represent the<br>
>> total momentum transferred. Can you explain more
on “better the k<br>
>> values in the reflectivity file to be around e.g.
1.0 Angs-1.”<br>
>> Does the guide_gravity component have a different
definition on<br>
>> reflectivity file? My actual source wavelength
ranges from 0 to 10<br>
>> [Angs].____<br>
>><br>
>> __ __<br>
>><br>
>> And also for Peter, my actual problem is to
optimize a polarizer<br>
>> which is built by stack of supermirror. I’m
trying to find a way<br>
>> to get the most transmission through that setup.
So I want to<br>
>> calculate the ratio neutron_out/neutron_in. Now
it seems that I<br>
>> should just divide the intensity instead of event
numbers?____<br>
>><br>
>> __ __<br>
>><br>
>> __ __<br>
>><br>
>> Happy Lunar New Year,____<br>
>><br>
>> Lingnan Shen____<br>
>><br>
>> __ __<br>
>><br>
>> *From: *Peter Kjær Willendrup <mailto:<a
href="mailto:pkwi@fysik.dtu.dk" target="_blank"
moz-do-not-send="true">pkwi@fysik.dtu.dk</a>><br>
>> *Sent: *Tuesday, February 5, 2019 4:20 AM<br>
>> *To: *Lingnan Shen <mailto:<a
href="mailto:ls8vm@virginia.edu" target="_blank"
moz-do-not-send="true">ls8vm@virginia.edu</a>><br>
>> *Cc: *Emmanuel Farhi <mailto:<a
href="mailto:farhi@ill.fr" target="_blank"
moz-do-not-send="true">farhi@ill.fr</a>><br>
>> *Subject: *Re: [mcstas-users] Guide_gravity
Problem<br>
>><br>
>> __ __<br>
>><br>
>> Hello again, ____<br>
>><br>
>> __ __<br>
>><br>
>> __ __<br>
>><br>
>> A better starting point for understanding
Guide_gravity and<br>
>> reflectivity files may be the instrument file
Test_Guides which is<br>
>> included with your McStas installation, in
combination with one of<br>
>> the example reflectivity files from the data
folder - e.g.<br>
>> supermirror_m3.rdl.____<br>
>><br>
>> __ __<br>
>><br>
>> Also, for a pencil beam with controllable
divergence, an option is<br>
>> to use Source_div.____<br>
>><br>
>> __ __<br>
>><br>
>> Hope this helps - otherwise you are welcome to
write again,<br>
>> preferably with a good description of what exact
problem you are<br>
>> trying to solve. :-)____<br>
>><br>
>> __ __<br>
>><br>
>> Best,____<br>
>><br>
>> __ __<br>
>><br>
>> Peter____<br>
>><br>
>><br>
>><br>
>> ____<br>
>><br>
>> On 5 Feb 2019, at 10.12, Peter Kjær
Willendrup<br>
>> <<a href="mailto:pkwi@fysik.dtu.dk"
target="_blank" moz-do-not-send="true">pkwi@fysik.dtu.dk</a>
<mailto:<a href="mailto:pkwi@fysik.dtu.dk" target="_blank"
moz-do-not-send="true">pkwi@fysik.dtu.dk</a>>>
wrote:____<br>
>><br>
>> __ __<br>
>><br>
>> Hello Lingnan, ____<br>
>><br>
>> __ __<br>
>><br>
>> __ __<br>
>><br>
>> Agree with Emmanuel. ____<br>
>><br>
>> __ __<br>
>><br>
>> Further, the combination of a pencil-beam,
i.e. almost<br>
>> non-divergent source and using 500 channels
in a rotated<br>
>> Guide_gravity means that transport through
the guide becomes<br>
>> close to impossible. ____<br>
>><br>
>> __ __<br>
>><br>
>> With regard to your second question you
should always consider<br>
>> the transported intensity I. The event count
is simply a<br>
>> measure of statistics (of "neutron rays", not
“neutrons”).____<br>
>><br>
>> __ __<br>
>><br>
>> __ __<br>
>><br>
>> Best,____<br>
>><br>
>> __ __<br>
>><br>
>> Peter Willendrup____<br>
>><br>
>> __ __<br>
>><br>
>> __ __<br>
>><br>
>> On 5 Feb 2019, at 10.01, Emmanuel FARHI
<<a href="mailto:farhi@ill.fr" target="_blank"
moz-do-not-send="true">farhi@ill.fr</a><br>
>> <mailto:<a href="mailto:farhi@ill.fr"
target="_blank" moz-do-not-send="true">farhi@ill.fr</a>>>
wrote:____<br>
>><br>
>> __ __<br>
>><br>
>> Hello Lingnan,<br>
>><br>
>> Your reflectivity file is given for k=0
to 0.14 Angs-1.<br>
>> This is very small and covers neutrons
around lambda=60<br>
>> Angs, which are not even created by your
source. Change<br>
>> either the lambda setting at the source,
or better the k<br>
>> values in the reflectivity file to be
around e.g. 1.0 Angs-1.<br>
>><br>
>> Cheers, Emmanuel.<br>
>><br>
>> __ __<br>
>><br>
>> On 2/5/19 7:17 AM, Lingnan Shen
wrote:____<br>
>><br>
>> Hi all, ____<br>
>><br>
>> __ __<br>
>><br>
>> I was trying to learn how to
use the<br>
>> guide_gravity component. I tried to
define the<br>
>> reflectivity curve but I get zero
neutrons at the<br>
>> wavelength monitor in the end of
guide. I have<br>
>> attached my .instr and .rfl file. I
also found that<br>
>> even if the neutron beam just go
through the guide.<br>
>> The detector at the end still see
nothing.____<br>
>><br>
>> Also another question about
transmission of<br>
>> certain setup. To calculate the ratio
of neutron_in /<br>
>> neutron_out. I want to know how much
neutron remained<br>
>> after passing through that setup.
Should I use the<br>
>> flux or the events count?____<br>
>><br>
>> __ __<br>
>><br>
>> Sincerely,____<br>
>><br>
>> Lingnan Shen____<br>
>><br>
>><br>
>><br>
>> ____<br>
>><br>
>>
_______________________________________________<br>
>><br>
>> mcstas-users mailing list<br>
>><br>
>> <a
href="mailto:mcstas-users@mcstas.org" target="_blank"
moz-do-not-send="true">mcstas-users@mcstas.org</a>
<mailto:<a href="mailto:mcstas-users@mcstas.org"
target="_blank" moz-do-not-send="true">mcstas-users@mcstas.org</a>><br>
>><br>
>> <a
href="https://mailman2.mcstas.org/mailman/listinfo/mcstas-users"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://mailman2.mcstas.org/mailman/listinfo/mcstas-users</a><br>
>><br>
>> -- <br>
>><br>
>> Emmanuel
FARHI, \|/ ____ \|/<br>
>><br>
>> Spectroscopy Group Institut Laue-Langevin
(ILL) Grenoble ~@-/ oO \-@~<br>
>><br>
>> 71 av des Martyrs,CS 20156,38042 Grenoble
Cedex 9,France /_( \__/ )_\<br>
>><br>
>> Work :Tel (33/0) 4 76 20 71 35. Fax
(33/0) 4 76 48 39 06 \__U_/ <br>
>><br>
>>
_______________________________________________<br>
>> mcstas-users mailing list<br>
>> <a href="mailto:mcstas-users@mcstas.org"
target="_blank" moz-do-not-send="true">mcstas-users@mcstas.org</a>
<mailto:<a href="mailto:mcstas-users@mcstas.org"
target="_blank" moz-do-not-send="true">mcstas-users@mcstas.org</a>><br>
>> <a
href="https://mailman2.mcstas.org/mailman/listinfo/mcstas-users____"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://mailman2.mcstas.org/mailman/listinfo/mcstas-users____</a><br>
>><br>
>> __ __<br>
>><br>
>><br>
>> Peter Kjær Willendrup<br>
>> Forskningsingeniør, Specialkonsulent<br>
>> Næstformand for DTU Fysik LSU<br>
>><br>
>> DTU Physics____<br>
>><br>
>><br>
>> <image001.gif><br>
>><br>
>><br>
>> Technical University of Denmark<br>
>><br>
>><br>
>> <image002.gif><br>
>><br>
>><br>
>><br>
>> Department of Physics<br>
>> Fysikvej<br>
>> Building 307<br>
>> DK-2800 Kongens Lyngby<br>
>> Direct +45 2125 4612<br>
>> Mobil +45 2125 4612<br>
>> Fax +45 4593 2399<br>
>> <a href="mailto:pkwi@fysik.dtu.dk"
target="_blank" moz-do-not-send="true">pkwi@fysik.dtu.dk</a>
<mailto:<a href="mailto:pkwi@fysik.dtu.dk" target="_blank"
moz-do-not-send="true">pkwi@fysik.dtu.dk</a>> ____<br>
>><br>
>> __ __<br>
>><br>
>> __ __<br>
>><br>
>><br>
>> Peter Kjær Willendrup<br>
>> Forskningsingeniør, Specialkonsulent<br>
>> Næstformand for DTU Fysik LSU<br>
>><br>
>> DTU Physics____<br>
>><br>
>><br>
>> <a
href="mailto:cid%3Ab6339554-7f28-441d-9f31-5944f811397c@win.dtu.dk"
target="_blank" moz-do-not-send="true">cid:b6339554-7f28-441d-9f31-5944f811397c@win.dtu.dk</a><br>
>><br>
>><br>
>> Technical University of Denmark<br>
>><br>
>><br>
>> <a
href="mailto:cid%3Ae108e480-fcab-46e2-9531-b38165079572@win.dtu.dk"
target="_blank" moz-do-not-send="true">cid:e108e480-fcab-46e2-9531-b38165079572@win.dtu.dk</a><br>
>><br>
>><br>
>><br>
>> Department of Physics<br>
>> Fysikvej<br>
>> Building 307<br>
>> DK-2800 Kongens Lyngby<br>
>> Direct +45 2125 4612<br>
>> Mobil +45 2125 4612<br>
>> Fax +45 4593 2399<br>
>> <a href="mailto:pkwi@fysik.dtu.dk"
target="_blank" moz-do-not-send="true">pkwi@fysik.dtu.dk</a>
<mailto:<a href="mailto:pkwi@fysik.dtu.dk" target="_blank"
moz-do-not-send="true">pkwi@fysik.dtu.dk</a>> ____<br>
>><br>
>> __ __<br>
>><br>
>> __ __<br>
>><br>
>><br>
>> _______________________________________________<br>
>> mcstas-users mailing list<br>
>> <a href="mailto:mcstas-users@mcstas.org"
target="_blank" moz-do-not-send="true">mcstas-users@mcstas.org</a>
<mailto:<a href="mailto:mcstas-users@mcstas.org"
target="_blank" moz-do-not-send="true">mcstas-users@mcstas.org</a>><br>
>> <a
href="https://mailman2.mcstas.org/mailman/listinfo/mcstas-users"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://mailman2.mcstas.org/mailman/listinfo/mcstas-users</a><br>
> _______________________________________________<br>
> mcstas-users mailing list<br>
> <a href="mailto:mcstas-users@mcstas.org"
target="_blank" moz-do-not-send="true">mcstas-users@mcstas.org</a>
<mailto:<a href="mailto:mcstas-users@mcstas.org"
target="_blank" moz-do-not-send="true">mcstas-users@mcstas.org</a>><br>
> <a
href="https://mailman2.mcstas.org/mailman/listinfo/mcstas-users"
rel="noreferrer" target="_blank" moz-do-not-send="true">https://mailman2.mcstas.org/mailman/listinfo/mcstas-users</a><br>
> <br>
> <br>
> _______________________________________________<br>
> mcstas-users mailing list<br>
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moz-do-not-send="true">mcstas-users@mcstas.org</a><br>
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rel="noreferrer" target="_blank" moz-do-not-send="true">https://mailman2.mcstas.org/mailman/listinfo/mcstas-users</a><br>
> <br>
<br>
</blockquote>
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<br>
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<pre class="moz-quote-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="https://mailman2.mcstas.org/mailman/listinfo/mcstas-users">https://mailman2.mcstas.org/mailman/listinfo/mcstas-users</a>
</pre>
</blockquote>
<pre class="moz-signature" cols="72">--
Emmanuel FARHI, \|/ ____ \|/
Spectroscopy Group Institut Laue-Langevin (ILL) Grenoble ~@-/ oO \-@~
71 av des Martyrs,CS 20156,38042 Grenoble Cedex 9,France /_( \__/ )_\
Work :Tel (33/0) 4 76 20 71 35. Fax (33/0) 4 76 48 39 06 \__U_/
</pre>
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