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<p class="MsoNormal"><span lang="EN-US">Hello everyone,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I am writing to inquire for advice on the use of the cohomology function in GetDP.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The system I am trying to simulated is a superconducting single-pancake coil. To simplify it, I made an asymmetrical model where the single-pancake (which is in reality a conductor wound in spiral) is replaced by a set
of concentric tori. In this configuration I am looking for a way to enforce current constraints so that the same total current flows through the cross section of each torus. I am planning to do it using the cohomology function one of the following ways (but
as I am not particularly sure I understood perfectly that function, I may be doing something wrong). If someone knows well how it works, I would appreciate some advice on the method and the way to implement it.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l1 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">As my air surface has Nturns (number of turns) holes, I will need Nturns cuts to control the current in each tape. The first way I imagine I can do this is depicted on the enclosed figure with the green cuts.
The first cut goes from one edge of the air enclosure to the first turn, then each subsequent cut goes from turn<sub>n-1</sub> to turn<sub>n</sub>. For constraints, I use for cut i : I<sub>turn</sub> * ( Nturns – i + 1 ).<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l1 level1 lfo1"><![if !supportLists]><span lang="EN-US" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">My other idea is to make each cut to start from the enclosure and finish on one cut (the red dotted lines on the figure). With this solution I think that enforcing current constraints become easier : I just
have to set each current constraints to I<sub>turn</sub>.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Anyway, my problem is that, for both solutions, I need to have precise control on the starting / ending point of each cut and its orientation. So my questions are :<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l2 level1 lfo3"><![if !supportLists]><span lang="EN-US" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b><span lang="EN-US">Is it possible to specify where a cut should start and end ?</span></b><span lang="EN-US"> (maybe thought the second brackets of the Cohomology function ?)
<b>Or is it possible to tell it afterwards once it has been made ?<o:p></o:p></b></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l2 level1 lfo3"><![if !supportLists]><span lang="EN-US" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><b><span lang="EN-US">Can I force the cuts to have the same orientation ? Or, again, deduce the orientation once it has been made ?<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I would really appreciate your help. At least, if someone familiar with the source code could tell me where to look for the implementation of the Cohomology function, that would be an useful start.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Faithfully yours,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#000099;mso-fareast-language:FR">Guillaume DILASSER</span><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#000099;mso-fareast-language:FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099;mso-fareast-language:FR">Doctorant SACM / LEAS<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099;mso-fareast-language:FR">CEA - Centre de Saclay - Bāt.123 - PC 319c</span><span style="color:#000099;mso-fareast-language:FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099;mso-fareast-language:FR">91191 Gif sur Yvette Cedex - France -</span><span style="color:#000099;mso-fareast-language:FR"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099;mso-fareast-language:FR"><o:p> </o:p></span></p>
<p class="MsoNormal"><a href="mailto:guillaume.dilasser@cea.fr"><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:blue;mso-fareast-language:FR">guillaume.dilasser@cea.fr</span></a><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#000099;mso-fareast-language:FR"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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