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<div class="moz-cite-prefix">Dear Diego,<br>
<br>
The chopper on a reactor source works a little counter-intuitive.
Could you send me the McStas instrument file, so I can diagnose
better?<br>
<br>
best, Kim<br>
<br>
<br>
On 08/23/2017 05:32 PM, Diego Ferraro wrote:<br>
</div>
<blockquote cite="mid:599D75CA020000F900025947@gw1.invap.com.ar"
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<div>Dear All, </div>
<div> I'm new in McStas modelling and I'm having some
problems understanding the results from Code. I'm using the
2.4.1 version to model a simple TOF example using a reactor
beam as source (thermal) and a disk chopper. My model (se
attached .png) consist of Maxwelian source (using Source_gen),
a non-reflecting beam (using guide with m=0), a Chopper (using
DiskChopper) another ~5m beam after the chopper and finally, a
collimator and an MCA in time mode (modeled using a
TOF_monitor with 1000 Time channels). </div>
<div> I get the results in TOF monitor and several questions
arise: </div>
<div> 1 - The results are per unit time (1/s) as for the flux
? (i.e. the TOF monitor represents the acumulated counts in 1s
with efficiency =1) ?</div>
<div> 2 - I should expect that the transmision of the Chopper
would change with its velocity, but I found no dependency in
TOF monitor (see attached Figure). </div>
<div> Obviously I am missing something, but I cannot figure
which is the problem. </div>
<div> Thanks in advance for any help, </div>
<div> Diego Ferraro</div>
</div>
<div><br>
<br>
<br>
</div>
<br>
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