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<div>Hello all,</div>
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<div>The McStas team is finally ready with McStas 2.1 - packages are released and ready for download via <a href="http://downloads.mcstas.org/mcstas-2.1">http://downloads.mcstas.org/mcstas-2.1</a> !</div>
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<div>A list of selected, important highligts from the release are listed below the email siganture. For the full list of changes, please consult the CHANGES document at <a href="http://www.mcstas.org/CHANGES_McStas">http://www.mcstas.org/CHANGES_McStas</a>.</div>
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<div>The McStas team wish you all the best and happy simulating!</div>
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<div>Peter Willendrup</div>
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Peter Kjζr Willendrup</td>
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Senior Research Engineer, Special Advisor</td>
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DTU Physics</td>
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<b><span style="font-size: 8pt; font-family: Arial, sans-serif; color: black;">Technical University of Denmark<o:p></o:p></span></b></div>
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<span style="font-size: 8pt; font-family: Arial, sans-serif; color: black;">Department o</span><span style="font-size: 8pt; font-family: Arial, sans-serif; color: rgb(31, 73, 125);">f</span><span style="font-size: 8pt; font-family: Arial, sans-serif; color: black;"> Physics<o:p></o:p></span></div>
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<span style="font-size: 8pt; font-family: Arial, sans-serif; color: black;">Direct +45 2125 4612<o:p></o:p></span></div>
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<span style="font-size: 8pt; font-family: Arial, sans-serif; color: black;">Fax +45 4593 2399<o:p></o:p></span></div>
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__________________</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span style="orphans: 2; widows: 2;">__________________</span></div>
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<div style="orphans: auto; widows: auto;">Selected release highlights:</div>
<br style="orphans: auto; widows: auto;">
<div style="orphans: auto; widows: auto;"><span class="Apple-tab-span" style="white-space: pre;"></span> McStas 2.1 is the second release in the 2.x series and fixes various issues with McStas 2.0, plus provide important new developments.<br>
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<div style="orphans: auto; widows: auto;"><span class="Apple-tab-span" style="white-space: pre;"></span> IMPORTANT: Please ensure to use our "migration scripts" for McStas 2.0 and 1.12c if you want these to co-exist with 2.1. Also, please read the platform-specific notes!<br>
</div>
<div style="orphans: auto; widows: auto;"><span class="Apple-tab-span" style="white-space: pre;"></span> General:<br>
<div><span class="Apple-tab-span" style="white-space: pre;"></span> Via NeXus libraries and a new --format=Mantid setting for the mcdisplay tool, we are now able to generate NeXus/HDF files that can be read and treated by Mantid! Mcdisplay generates a Mantid
IDF description for embedding in the NeXus file, including the usual McStas instrument geometry. Please read the specific guide for this method, documented in the McStas manual, Chapter 6.<br>
</div>
<div><span class="Apple-tab-span" style="white-space: pre;"></span> Use of STATE_PARAMETERS and POLARIZATION parameters is no longer supported! If you have home-grown components using these, you will get this type of error with McStas 2.1:<br>
<div> Translating instrument definition 'BNL_H8.instr' into C ...</div>
<div> mcstas -t -o BNL_H8.c BNL_H8.instr</div>
<div> Compiling simulation BNL_H8.instr</div>
<div> Arm.comp is using STATE PARAMETERS</div>
<div> <span class="Apple-tab-span" style="white-space: pre;"> </span> mcstas-2.1 does NOT support this keyword. Please remove line 36</div>
<div> mcstas-2.1: 1 Errors encountered during parse of BNL_H8.instr.</div>
<div> ** Error exit **</div>
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<div><span class="Apple-tab-span" style="white-space: pre;"></span> As the error message suggests, this can be fixed by simply removing/commenting out the STATE and POLARISATION parameter lines in the top of the component, i.e.:<br>
<div> /* STATE PARAMETERS (x,y,z,vx,vy,vz,t,s1,s2,p) */</div>
<div> /* POLARISATION PARAMETERS (sx,sy,sz) */</div>
<div> <span class="Apple-tab-span" style="white-space: pre;"> </span> In case of "negative time" propagation we no longer ABSORB these neutrons but rather restore the incoming neutron state, leaving it untouched for the following components. This avoids
various types of shadowing effects, e.g. when placing parallel monitors that are not in a GROUP. This is furhter in preparation for the forthcoming ASSEMBLY keyword which will work roughly like an "iterative group" that loops on the ASSEMBLY of components
until no furhter scattering is achieved, but always scatters first on the component which is closest (in time) to the neutron.</div>
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<div><span class="Apple-tab-span" style="white-space: pre;"></span> "Scatter logging": With this release we provide this special ensemble of instrument examples<br>
<div><span class="Apple-tab-span" style="white-space: pre;"></span> Test_Scatter_log_losses.instr<br>
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<div><span class="Apple-tab-span" style="white-space: pre;"></span> Test_Scatter_log_mvalues.instr<br>
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<div><span class="Apple-tab-span" style="white-space: pre;"></span> Test_Scatter_log_ssw_mcnp.instr that together with the (misc cathegory) components<br>
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<div><span class="Apple-tab-span" style="white-space: pre;"></span> Scatter_log_iterator.comp<br>
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<div><span class="Apple-tab-span" style="white-space: pre;"></span> Scatter_log_iterator_stop.comp<br>
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<div><span class="Apple-tab-span" style="white-space: pre;"></span> Scatter_logger.comp<br>
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<div><span class="Apple-tab-span" style="white-space: pre;"></span> Scatter_logger_stop.comp<br>
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<div><span class="Apple-tab-span" style="white-space: pre;"></span> provide a powerful post-processing mechanism, mainly for guide systems - that for instance can be used to study the non-propagated, i.e. absorbed neutron flux along the guide. For more information,
a paper by Esben Klinkby et. al. will be available in one of the next issues of Journal of Physics: Conference Series, proceedings of the NOP&D 2013 meeting in Ismaning. Slides from Esbens talk are available here:http://<a href="http://orbit.dtu.dk/files/57025387/prod11375088187360.NO_P_v8.pdf">orbit.dtu.dk/files/57025387/prod11375088187360.NO_P_v8.pdf</a><br>
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<div style="orphans: auto; widows: auto;"><span class="Apple-tab-span" style="white-space: pre;"></span> Another important change is an optimization of the Single_crystal component that results in very large speedups, especially for large unit cells with many
reflections. A speedup of more than a factor of 500 has been observed with the Perdeuterated pyrophosphatase system, for which a very large reflection list (.lau format) is provided.<br>
</div>
<div style="orphans: auto; widows: auto;"><span class="Apple-tab-span" style="white-space: pre;"></span> The release also contains the latest revision of the ESS_moderator component, including updated "pancake" source brilliance calculated by the ESS neutronics
group and parametrized for McStas by Troels Schφnfeldt, DTU Nutech.<br>
</div>
<span style="orphans: auto; widows: auto;">We have also received a nice, long list of contributions and have also developed and improved both components, instruments and core package functionalty. For the full list</span><span style="orphans: auto; widows: auto;"> </span><span style="orphans: auto; widows: auto;">of
changes, please consult the</span><span style="orphans: auto; widows: auto;"> </span><span style="orphans: auto; widows: auto;">CHANGES document.</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></div>
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