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<div style="word-wrap:break-word">Hi all,
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<div>This is just to let you know that the McStas team is working hard toward a new McStas release, McStas 2.1.</div>
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<div>Only one bit is missing: An updated ESS moderator component with:</div>
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<div>* Possibility for “pancake” spectra</div>
<div>* Simplified interface with less parameters, brilliance is defined via a simple string like “2001”, “TDR” or “2014”</div>
<div>* Possibility for either</div>
<div><span class="x_Apple-tab-span" style="white-space:pre"></span>- MCNPX-like geometry with cylindrical cold moderator, thermal wings</div>
<div><span class="x_Apple-tab-span" style="white-space:pre"></span>- Simple flat, mono-spectral source</div>
<div>* Fixes the bispectral weighting issue mentioned below</div>
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<div>A tentative list of changes wrt. McStas 2.0 is available as an attachment to this email. The release should be available within apx. 1 week.</div>
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<div>Now for the bispectral weighting issue:</div>
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<div>In the currently available McStas bispectral sources, i.e.</div>
<div><span class="x_Apple-tab-span" style="white-space:pre"></span>- The “standard” McStas 2.0 bispectral source</div>
<div><span class="x_Apple-tab-span" style="white-space:pre"></span>- The “updated” ESS source for 1.12c and 2.0 use, (inside
<a href="http://www.mcstas.org/download/share/ESS_source_20130502.zip">http://www.mcstas.org/download/share/ESS_source_20130502.zip</a>)</div>
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<div>a bug was found, affecting bispectral instruments ONLY, where 0 < cold_frac < 1.</div>
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<div>The “standard”, simple 1.12c mono-spectral source is NOT affected.</div>
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<div>When assigning statistics to the cold part of the spectrum via the cold_frac input parameter, a re-weighting of the spectrum was missing, i.e.:</div>
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<div>if (cold) {<br>
p/=cold_frac; // Divide by cold_frac to renormalise cold moderator intensity<br>
} else {<br>
p/=(1-cold_frac); // Divide by (1-cold_frac) to renormalise thermal moderator intensity<br>
}<br>
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<div>* In the case of a cold_frac of 50%, this means that existing results have been UNDERestimated by a ‘clean’ factor of 2. </div>
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<div>* As you can see from the “equations", a cold_frac = 1 (i.e. cold neutrons only) or cold_frac = 0 (i.e. thermal neutrons only), these cases are NOT affected by the mis-weighting.</div>
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<div>* For non-trivial choices of cold_frac, the re-weighting is not as simple.</div>
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<div>We advice you to install McStas 2.1 to fix the issue. This release should be available within apx. 1 week.</div>
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<div>If you have any questions or concerns regarding this or other issues with McStas, feel free to write me an email.</div>
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<div>Best regards, and sorry for any inconvenience this may have caused!</div>
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<div>Peter Willendrup</div>
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