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<p>Hello Lingnan,</p>
<p>Your reflectivity file is given for k=0 to 0.14 Angs-1. This is
very small and covers neutrons around lambda=60 Angs, which are
not even created by your source. Change either the lambda setting
at the source, or better the k values in the reflectivity file to
be around e.g. 1.0 Angs-1.<br>
</p>
<p>Cheers, Emmanuel.<br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 2/5/19 7:17 AM, Lingnan Shen wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAFfmUqmA_Nk=p=kuo2Yv1h+GA51H8NqVGNEgQLXZT7NqWMHygg@mail.gmail.com">
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<div dir="ltr">Hi all,
<div><br>
</div>
<div> I was trying to learn how to use the guide_gravity
component. I tried to define the reflectivity curve but I get
zero neutrons at the wavelength monitor in the end of guide. I
have attached my .instr and .rfl file. I also found that even
if the neutron beam just go through the guide. The detector at
the end still see nothing.</div>
<div> Also another question about transmission of certain
setup. To calculate the ratio of neutron_in / neutron_out. I
want to know how much neutron remained after passing through
that setup. Should I use the flux or the events count?</div>
<div><br>
</div>
<div>Sincerely,</div>
<div>Lingnan Shen</div>
</div>
<br>
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</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_/
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