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Hello Lingnan,
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<div>Agree with Emmanuel. </div>
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<div>Further, the combination of a pencil-beam, i.e. almost non-divergent source and using 500 channels in a rotated Guide_gravity means that transport through the guide becomes close to impossible. </div>
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<div>With regard to your second question you should always consider the transported intensity I. The event count is simply a measure of statistics (of "neutron rays", not “neutrons”).</div>
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<div>Best,</div>
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<div>Peter Willendrup</div>
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<div class="">On 5 Feb 2019, at 10.01, Emmanuel FARHI <<a href="mailto:farhi@ill.fr" class="">farhi@ill.fr</a>> wrote:</div>
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<p class="">Hello Lingnan,</p>
<p class="">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 class="">
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<p class="">Cheers, Emmanuel.<br class="">
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<div class="moz-cite-prefix">On 2/5/19 7:17 AM, Lingnan Shen wrote:<br class="">
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<blockquote type="cite" cite="mid:CAFfmUqmA_Nk=p=kuo2Yv1h+GA51H8NqVGNEgQLXZT7NqWMHygg@mail.gmail.com" class="">
<div dir="ltr" class="">Hi all,
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<div class=""> 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 class=""> 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>
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<div class="">Sincerely,</div>
<div class="">Lingnan Shen</div>
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<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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Peter Kjær Willendrup<br class="">
Forskningsingeniør, Specialkonsulent<br class="">
Næstformand for DTU Fysik LSU<br class="">
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