<p dir="ltr">The source is definitely a part of the instrument, not something at the top level of the experiment (NXentry). Consider the case of a synchrotron X-ray experiment with a laser pump.  There are two sources to be documented.  They both belong under the description of the pump/probe instrument.</p>
<p dir="ltr">Why should the beam be part of the sample? Makes no sense at all.  The sample has no beam.  The beam does not describe the sample in any useful way.  NXbeam documents the state of the beam at some position along the path from source to detector.  It could go in many places along the optical path.</p>
<p dir="ltr">Pete</p>
<div class="gmail_quote">On May 11, 2016 6:17 AM, "Andreas Förster" <<a href="mailto:andreas.foerster@dectris.com">andreas.foerster@dectris.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra" style="font-size:12.8px">Dear NeXus folks,</div><div class="gmail_extra" style="font-size:12.8px"><br></div><div class="gmail_extra" style="font-size:12.8px">there was a little discussion last week about possible additions to the NeXus standard (and NXmx) to record beam information relevant for the estimation of dose.  Herbert proposed a good solution, but the outcome of this discussion is still pending.</div><div class="gmail_extra" style="font-size:12.8px"><br></div><div class="gmail_extra" style="font-size:12.8px">At DECTRIS, we're keen to tell our customers how to record additional metadata in a NeXus-compliant way.  That's why I'd like to have official word on the fields below:</div><div class="gmail_extra" style="font-size:12.8px"><br></div><div class="gmail_extra" style="font-size:12.8px">Information on the synchrotron should be recorded in an NX_Source group.  Is /entry/source the right place for that?</div><p style="font-size:12.8px"><span style="font-family:Symbol"><span style="font-stretch:normal;font-size:7pt;font-family:'Times New Roman'">     </span></span>/entry/source <a href="http://download.nexusformat.org/sphinx/classes/base_classes/NXsource.html" target="_blank"><i><span style="color:rgb(202,121,0);letter-spacing:-0.1pt">NX_SOURCE</span></i></a></p><p style="font-size:12.8px;margin:9.6pt 0cm 6pt 72pt;line-height:15.75pt;background-image:initial;background-repeat:initial"><span style="font-size:10.5pt;font-family:'Courier New';color:black;letter-spacing:-0.1pt">o<span style="font-stretch:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">   </span></span><b><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">name</span></b><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">: </span><a href="http://download.nexusformat.org/sphinx/nxdl-types.html#nx-char" target="_blank"><i><span style="font-size:10.5pt;font-family:'Lucida Grande';color:rgb(202,121,0);letter-spacing:-0.1pt">NX_CHAR</span></i></a><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt"></span></p><p style="font-size:12.8px;margin:9.6pt 0cm 6pt 108pt;line-height:15.75pt;background-image:initial;background-repeat:initial"><span style="font-size:10.5pt;font-family:Wingdings;color:black;letter-spacing:-0.1pt">§<span style="font-stretch:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">  </span></span><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">Name of synchrotron</span></p><p style="font-size:12.8px;margin:9.6pt 0cm 6pt 72pt;line-height:15.75pt;background-image:initial;background-repeat:initial"><span style="font-size:10.5pt;font-family:'Courier New';color:black;letter-spacing:-0.1pt">o<span style="font-stretch:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">   </span></span><b><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">@short_name</span></b><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">: </span><a href="http://download.nexusformat.org/sphinx/nxdl-types.html#nx-char" target="_blank"><i><span style="font-size:10.5pt;font-family:'Lucida Grande';color:rgb(202,121,0);letter-spacing:-0.1pt">NX_CHAR</span></i></a><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt"></span></p><p style="font-size:12.8px;margin-left:108pt"><span style="font-family:Wingdings">§<span style="font-stretch:normal;font-size:7pt;font-family:'Times New Roman'">  </span></span><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">short name for source, perhaps the acronym</span></p><span style="font-size:12.8px">Data describing the beam as it hits the sample should probably go the NX_Beam group in /entry/sample/beam.  None of the fields below are currently defined.  Could these definitions be adopted?</span><div class="gmail_extra" style="font-size:12.8px"><p><span style="font-family:Symbol">·<span style="font-stretch:normal;font-size:7pt;font-family:'Times New Roman'">      </span></span>/entry/sample/beam <a href="http://download.nexusformat.org/sphinx/classes/base_classes/NXbeam.html" target="_blank"><i><span style="color:rgb(202,121,0);letter-spacing:-0.1pt">NX_BEAM</span></i></a></p><p style="margin:9.6pt 0cm 6pt 72pt;line-height:15.75pt;background-image:initial;background-repeat:initial"><span style="font-size:10.5pt;font-family:'Courier New';color:black;letter-spacing:-0.1pt">o<span style="font-stretch:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">   </span></span><b><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">name</span></b><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">: </span><a href="http://download.nexusformat.org/sphinx/nxdl-types.html#nx-char" target="_blank"><i><span style="font-size:10.5pt;font-family:'Lucida Grande';color:rgb(202,121,0);letter-spacing:-0.1pt">NX_CHAR</span></i></a><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt"></span></p><p style="margin:9.6pt 0cm 6pt 108pt;line-height:15.75pt;background-image:initial;background-repeat:initial"><span style="font-size:10.5pt;font-family:Wingdings;color:black;letter-spacing:-0.1pt">§<span style="font-stretch:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">  </span></span><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">Name of beamline</span></p><p style="margin:9.6pt 0cm 6pt 72pt;line-height:15.75pt;background-image:initial;background-repeat:initial"><span style="font-size:10.5pt;font-family:'Courier New';color:black;letter-spacing:-0.1pt">o<span style="font-stretch:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">   </span></span><b><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">total_flux/xray_flux</span></b><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">: </span><a href="http://download.nexusformat.org/sphinx/nxdl-types.html#nx-float" target="_blank"><i><span style="font-size:10.5pt;font-family:'Lucida Grande';color:rgb(202,121,0);letter-spacing:-0.1pt">NX_FLOAT</span></i></a><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt"> {units=</span><a href="http://download.nexusformat.org/sphinx/nxdl-types.html#nx-rate" target="_blank"><i><span style="font-size:10.5pt;font-family:'Lucida Grande';color:rgb(202,121,0);letter-spacing:-0.1pt">NX_RATE</span></i></a><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">}</span></p><p style="margin:5pt 0cm 5pt 108pt;line-height:15.75pt;background-image:initial;background-repeat:initial"><span style="font-family:Wingdings">§<span style="font-stretch:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">  </span></span><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">Beam intensity (example: s-1)</span></p><p style="margin:5pt 0cm 5pt 72pt;line-height:15.75pt;background-image:initial;background-repeat:initial"><span style="font-family:'Courier New'">o<span style="font-stretch:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">   </span></span><b><span style="color:black;letter-spacing:-0.1pt">incident_beam_size: </span></b><a href="http://download.nexusformat.org/sphinx/nxdl-types.html#nx-float" target="_blank"><i><span style="font-size:10.5pt;font-family:'Lucida Grande';color:rgb(202,121,0);letter-spacing:-0.1pt">NX_FLOAT</span></i></a><i><span style="font-size:10.5pt;font-family:'Lucida Grande';color:black;letter-spacing:-0.1pt">[2]</span></i></p><p style="margin:5pt 0cm 5pt 108pt;line-height:15.75pt;background-image:initial;background-repeat:initial"><span style="font-family:Wingdings">§<span style="font-stretch:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">  </span></span><span style="color:black;letter-spacing:-0.1pt">Two-dimensional array of FWHM (if Gaussian) or diameters (if top hat) of beam</span></p><p style="margin:5pt 0cm 5pt 72pt;line-height:15.75pt;background-image:initial;background-repeat:initial"><span style="font-family:'Courier New'">o<span style="font-stretch:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">   </span></span><b><span style="color:black;letter-spacing:-0.1pt">profile</span></b><span style="color:black;letter-spacing:-0.1pt">: </span><a href="http://download.nexusformat.org/sphinx/nxdl-types.html#nx-char" target="_blank"><i><span style="color:rgb(202,121,0);letter-spacing:-0.1pt">NX_CHAR</span></i></a></p><p style="margin:5pt 0cm 5pt 108pt;line-height:15.75pt;background-image:initial;background-repeat:initial"><span style="font-family:Wingdings">§<span style="font-stretch:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">  </span></span><span style="color:black;letter-spacing:-0.1pt">Gaussian or top hat</span></p><div class="gmail_extra"><br></div><div class="gmail_extra" style="font-size:12.8px"><span style="font-size:12.8px">Should the name of the beamline be recorded in beam or in source?  For the flux (as a rate - in contrast to the already existing flux density field "flux"), either name is fine by me.</span><br></div><div class="gmail_extra" style="font-size:12.8px"><span style="font-size:12.8px"><br></span></div><div class="gmail_extra" style="font-size:12.8px"><span style="font-size:12.8px">I'm happy to discuss these points during the next NeXus meeting.</span></div><div class="gmail_extra" style="font-size:12.8px"><br></div>Thank you and all best</div><div class="gmail_extra" style="font-size:12.8px"><br></div><div class="gmail_extra" style="font-size:12.8px"><br></div><div class="gmail_extra" style="font-size:12.8px">Andreas</div><div class="gmail_extra" style="font-size:12.8px"><br></div><div class="gmail_extra" style="font-size:12.8px"><br></div><div><br></div>-- <br><div><a href="https://www.dectris.com" target="_blank"></a><div><span style="font-family:Verdana;font-size:large">Andreas Förster, Ph.D.</span></div><div><font face="Verdana" size="1"><span style="color:rgb(128,128,128)">MX Application Scientist, Scientific Sales</span></font></div><div><span style="white-space:pre-wrap">   </span></div><div><font color="#808080" size="1"><font face="Verdana">Phone: </font></font><span style="color:rgb(128,128,128);font-family:Verdana;font-size:x-small"><a href="tel:%2B41%2056%20500%202100" value="+41565002100" target="_blank">+41 56 500 2100</a></span><font color="#808080" size="1"><font face="Verdana"> </font><span style="font-family:Arial,Helvetica,sans-serif;line-height:14px">|</span><span style="font-family:Verdana"> Direct</span><span style="font-family:Verdana">:</span><span style="font-family:Verdana"> </span></font><span style="color:rgb(128,128,128);font-family:Verdana;font-size:x-small"><a href="tel:%2B41%2056%20500%202176" value="+41565002176" target="_blank">+41 56 500 2176</a></span><font color="#808080" size="1"><span style="font-family:Verdana"> </span><span style="font-family:Arial,Helvetica,sans-serif;line-height:14px">|</span><span style="font-family:Verdana"> </span><font style="font-family:Verdana">Email:</font><span style="font-family:Verdana"> <a href="mailto:andreas.foerster@dectris.com" target="_blank">andreas.foerster@dectris.com</a></span></font></div><div><span style="font-size:x-small;color:rgb(128,128,128);font-family:Verdana">DECTRIS Ltd. </span><span style="font-size:x-small;color:rgb(128,128,128);font-family:Verdana;line-height:14px">|</span><span style="font-size:x-small;color:rgb(128,128,128);font-family:Verdana;line-height:14px"> Taefernweg 1</span><span style="font-size:x-small;color:rgb(128,128,128);font-family:Verdana;line-height:14px"> </span><span style="font-size:x-small;color:rgb(128,128,128);font-family:Verdana;line-height:14px">| 5405 Baden-Daettwil</span><span style="font-size:x-small;color:rgb(128,128,128);font-family:Verdana;line-height:14px"> </span><font style="font-size:x-small;color:rgb(128,128,128);font-family:Verdana;line-height:14px">| Switz</font><font size="1"><font face="Verdana"><font style="color:rgb(128,128,128);line-height:14px">erland</font><span style="color:rgb(128,128,128);line-height:14px"> </span><font style="color:rgb(128,128,128);line-height:14px">| </font></font><a href="https://www.dectris.com" target="_blank"><font face="Verdana">www.dectris.com</font></a></font></div><div><font size="1"><font style="color:rgb(128,128,128);font-family:Verdana;line-height:14px"><br></font></font></div><div><div><a href="https://www.linkedin.com/company/5067919" target="_blank"><img src="https://www.dectris.com/tl_files/root/signatur/linkein-ico1.png" alt="LinkedIn" style="width:15px;min-height:15px;margin-left:400px;float:left"></a></div></div><div> <a href="https://www.facebook.com/pages/Dectris-Ltd/623855944369304" target="_blank"><img src="https://www.dectris.com/tl_files/root/signatur/facebook-ico1.png" alt="facebook" style="width:15px;min-height:15px"></a> <a href="https://twitter.com/DECTRIS_News" target="_blank"><img src="https://www.dectris.com/tl_files/root/signatur/twitter-ico1.png" style="width:15px;min-height:15px"></a></div><div><br></div><div><br></div><div><img src="https://www.dectris.com/tl_files/root/signatur/dectris_plus%20slogan.png" style="float:left;min-height:30px;width:262px;margin-left:195px"></div><div><font face="Verdana" color="#808080" size="1"><br></font></div><div><font face="Verdana" color="#808080" size="1"><br></font></div><div><font face="Verdana" color="#808080" size="1"><br></font></div><div><font face="Verdana" color="#808080" size="1">Confidentiality Note: This message is intended only for the use of the named </font></div><div><font face="Verdana" color="#808080" size="1">recipient(s) </font><span style="color:rgb(128,128,128);font-family:Verdana;font-size:x-small">and may contain confidential and/or privileged information. </span><span style="color:rgb(128,128,128);font-family:Verdana;font-size:x-small">If you </span></div><div><span style="color:rgb(128,128,128);font-family:Verdana;font-size:x-small">are not the intended </span><span style="color:rgb(128,128,128);font-family:Verdana;font-size:x-small">recipient, please contact the sender and delete </span><span style="color:rgb(128,128,128);font-family:Verdana;font-size:x-small">the message.</span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