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<p class=MsoPlainText>Dear Emmanuel<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Thank you very much for the information. Regarding the
divergence output dX and dY, are they the full width half maximum or the c
value in the Gaussian function?<o:p></o:p></p>
<p class=MsoPlainText><img width=280 height=42 id="_x0000_i1025"
src="cid:image003.jpg@01C9FE39.346C3EF0"><o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Many thanks for your reply!!<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Shu<o:p></o:p></p>
<p class=MsoPlainText>-----Original Message-----<br>
From: Emmanuel FARHI [mailto:farhi@ill.fr] <br>
Sent: 03 July 2009 20:23<br>
To: McStas users list at mcstas.org<br>
Subject: Re: [mcstas-users] divergence monitor output<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Hello Shu,<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Any divergence monitor such as the Divergence_monitor()
or the<o:p></o:p></p>
<p class=MsoPlainText>Monitor_nD(options="hdiv vdiv, all auto") will
indeed produce a <o:p></o:p></p>
<p class=MsoPlainText>divergence<o:p></o:p></p>
<p class=MsoPlainText>map.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Then the output files have lines:<o:p></o:p></p>
<p class=MsoPlainText> value: I I_err N<o:p></o:p></p>
<p class=MsoPlainText> statistics: X0 dX Y0 dY<o:p></o:p></p>
<p class=MsoPlainText>where<o:p></o:p></p>
<p class=MsoPlainText>I, I_err and N: are the values of the intensity (usually
integrated <o:p></o:p></p>
<p class=MsoPlainText>flux),<o:p></o:p></p>
<p class=MsoPlainText>the error bar on this value, and the number of
statistical MC events<o:p></o:p></p>
<p class=MsoPlainText>recorded on the detector (which is not the flux, but a
non physical <o:p></o:p></p>
<p class=MsoPlainText>event<o:p></o:p></p>
<p class=MsoPlainText>count, only for computational purpose).<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>X0 dX Y0 dY: are the center (mean value, 1st moment) and
second moment<o:p></o:p></p>
<p class=MsoPlainText>(gaussian width) of the distributions. In your case, dX
and dY will give<o:p></o:p></p>
<p class=MsoPlainText>you a gaussian width of the H and V divergence. X0 and Y0
should in<o:p></o:p></p>
<p class=MsoPlainText>principle be around zero if the monitor is well oriented.<o:p></o:p></p>
<p class=MsoPlainText>just do<o:p></o:p></p>
<p class=MsoPlainText>>> eval(mc_divmon_dat.statistics); [ dX dY ]<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Emmanuel.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>> Dear all<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>> I have question about the results from the
Divergence_monitor <o:p></o:p></p>
<p class=MsoPlainText>> Component.<o:p></o:p></p>
<p class=MsoPlainText>> I want to find out the beam divergence. Is this the
right monitor to<o:p></o:p></p>
<p class=MsoPlainText>> use? If it is, which value in the output file shall
I use as the <o:p></o:p></p>
<p class=MsoPlainText>> maximum<o:p></o:p></p>
<p class=MsoPlainText>> divergence? What do these values X0, dX, Y0 and dY
from<o:p></o:p></p>
<p class=MsoPlainText>> "mc_divmon_dat.statistics" mean? What are
the meaning for the values<o:p></o:p></p>
<p class=MsoPlainText>> from "mc_divmon_dat.values"?<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>> Best regards,<o:p></o:p></p>
<p class=MsoPlainText>> Shu<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>> --<o:p></o:p></p>
<p class=MsoPlainText>> Scanned by iCritical.<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText>> _______________________________________________<o:p></o:p></p>
<p class=MsoPlainText>> mcstas-users mailing list<o:p></o:p></p>
<p class=MsoPlainText>> mcstas-users@mcstas.org<o:p></o:p></p>
<p class=MsoPlainText>>
http://mailman.mcstas.org/cgi-bin/mailman/listinfo/mcstas-users<o:p></o:p></p>
<p class=MsoPlainText>><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>-- <o:p></o:p></p>
<p class=MsoPlainText>FARHI Emmanuel <farhi@ill.fr><o:p></o:p></p>
<p class=MsoPlainText>Groupe DS/CS, ILL4/156, Tel 04 76 20 71 35<o:p></o:p></p>
<p class=MsoPlainText>ILL, Grenoble<o:p></o:p></p>
<p class=MsoPlainText>_______________________________________________<o:p></o:p></p>
<p class=MsoPlainText>mcstas-users mailing list<o:p></o:p></p>
<p class=MsoPlainText>mcstas-users@mcstas.org<o:p></o:p></p>
<p class=MsoPlainText>http://mailman.mcstas.org/cgi-bin/mailman/listinfo/mcstas-users<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
</div>
<br><p>--
<BR>Scanned by iCritical.
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