http://fispact.ukaea.uk/wiki/index.php?title=Keyword:WALL&feed=atom&action=historyKeyword:WALL - Revision history2024-03-28T12:11:31ZRevision history for this page on the wikiMediaWiki 1.26.2http://fispact.ukaea.uk/wiki/index.php?title=Keyword:WALL&diff=942&oldid=prevMark Gilbert at 16:36, 22 April 20202020-04-22T16:36:18Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>This keyword allows the input of the total neutron first wall loading wall in units of MW per square metre for a fusion device. This is converted to a flux value by using data read from the neutron spectrum file. The neutron spectrum file (<tt>fluxes</tt>) contains a value of the first wall loading, e.g. 4.15 MW<del class="diffchange diffchange-inline">*m−2 </del>. The energy integrated flux, e.g. 1.80 × <del class="diffchange diffchange-inline">1015 </del>n<del class="diffchange diffchange-inline">*cm−2*s−1</del>, which is approximated by the sum of neutrons in all the groups, is calculated and equated to the wall loading during library processing.  </div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>This keyword allows the input of the total neutron first wall loading wall in units of MW per square metre for a fusion device. This is converted to a flux value by using data read from the neutron spectrum file. The neutron spectrum file (<tt>fluxes</tt>) contains a value of the first wall loading, e.g. 4.15 MW <ins class="diffchange diffchange-inline">m{{sup|-2}}  </ins>. The energy integrated flux, e.g. 1.80 × <ins class="diffchange diffchange-inline">10{{sup|15}} </ins>n <ins class="diffchange diffchange-inline">cm{{sup|-2}} s{{sup|-1}}</ins>, which is approximated by the sum of neutrons in all the groups, is calculated <ins class="diffchange diffchange-inline">from the entries for each energy group in the fluxes file </ins>and equated to the wall loading during library processing.  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Note that it is the user’s responsibility to ensure that this wall loading is correct when the spectrum file is constructed. If a wall loading of 2.0 MW<del class="diffchange diffchange-inline">*m−2 </del>was input then a flux value of (2.0/4.15) × 1.80 × <del class="diffchange diffchange-inline">1015 </del>n<del class="diffchange diffchange-inline">*cm−2*s−1 </del>would be used in the calculations.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Note that it is the user’s responsibility to ensure that this wall loading is correct when the spectrum file is constructed. If a wall loading of 2.0 MW <ins class="diffchange diffchange-inline">m{{sup|-2}}  </ins>was input then a flux value of (2.0/4.15) × 1.80 × <ins class="diffchange diffchange-inline">10{{sup|15}}  </ins>n <ins class="diffchange diffchange-inline">cm{{sup|-2}}  s{{sup|-1}}  </ins>would be used in the calculations<ins class="diffchange diffchange-inline">. It is also important to ensure that the fluxes file used with the WALL keyword contains actual n cm{{sup|-2}}  s{{sup|-1}} for each energy group; while this is good practice in general it is not essential for standard calculations using [[Keyword:FLUX | '''FLUX''']] because that keyword overrides values in the fluxes file and only the relative distribution of fluxes in the different energy groups matters (e.g. the fluxes file could be normalised to one in that case and the simulation would still be valid). When using WALL, however, it is critical to have accurate absolute flux values in each energy group, which is entirely the responsibility of the user</ins>.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''WALL''' is a convenient alternative to using [[Keyword:FLUX | '''FLUX''']] for the irradiation of first wall materials, but great care must be exercised if it used for irradiations with other than first wall spectra. (In these cases the flux specified for the region must be that which would be present if the first wall loading shown in the file was present on the first wall.) It is recommended that '''FLUX''' is always used in preference to '''WALL''' unless the user has a run that makes its use essential.</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>'''WALL''' is a convenient alternative to using [[Keyword:FLUX | '''FLUX''']] for the irradiation of first wall materials, but great care must be exercised if it used for irradiations with other than first wall spectra. (In these cases the flux specified for the region must be that which would be present if the first wall loading shown in the file was present on the first wall.) It is recommended that '''FLUX''' is always used in preference to '''WALL''' unless the user has a run that makes its use essential.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>It should be noted that the wall loading describes the power that impinges on the first wall, ''not'' what is actually absorbed by it. In this sense the wall loading represents a convenient, but not fundamental, parameter. The power carried by the neutron flux impinging upon the first wall is related to the 14 MeV neutron current not flux. If one works out the heating power of 14 MeV neutrons it is found that a current ''C'', of 4.44 × <del class="diffchange diffchange-inline">1013 </del>n<del class="diffchange diffchange-inline">*cm−2*s−1 </del>is equivalent to 1 MW*<del class="diffchange diffchange-inline">m−2</del>. The relationship between 14 MeV neutron current and flux depends upon the source and first wall geometry and will vary from plant to plant.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>It should be noted that the wall loading describes the power that impinges on the first wall, ''not'' what is actually absorbed by it. In this sense the wall loading represents a convenient, but not fundamental, parameter. The power carried by the neutron flux impinging upon the first wall is related to the 14 MeV neutron current not flux. If one works out the heating power of 14 MeV neutrons it is found that a current ''C'', of 4.44 × <ins class="diffchange diffchange-inline">10{{sup|13}}  </ins>n <ins class="diffchange diffchange-inline">cm{{sup|-2}}  s{{sup|-1}}  </ins>is equivalent to 1 MW*<ins class="diffchange diffchange-inline">m{{sup|-2}} </ins>. The relationship between 14 MeV neutron current and flux depends upon the source and first wall geometry and will vary from plant to plant.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Example usage:</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Example usage:</div></td></tr>
</table>Mark Gilberthttp://fispact.ukaea.uk/wiki/index.php?title=Keyword:WALL&diff=186&oldid=prevMichael Fleming: 1 revision imported2016-09-08T12:41:43Z<p>1 revision imported</p>
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<td colspan='1' style="background-color: white; color:black; text-align: center;">Revision as of 12:41, 8 September 2016</td>
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</td></tr></table>Michael Fleminghttp://fispact.ukaea.uk/wiki/index.php?title=Keyword:WALL&diff=185&oldid=prevMichael Fleming: Created page with " {{big|'''WALL''' ''wall''}} ---- This keyword allows the input of the total neutron first wall loading wall in units of MW per square metre for a fusion device. This is con..."2016-07-14T15:30:28Z<p>Created page with " {{big|'''WALL''' ''wall''}} ---- This keyword allows the input of the total neutron first wall loading wall in units of MW per square metre for a fusion device. This is con..."</p>
<p><b>New page</b></p><div><br />
{{big|'''WALL''' ''wall''}}<br />
<br />
----<br />
<br />
This keyword allows the input of the total neutron first wall loading wall in units of MW per square metre for a fusion device. This is converted to a flux value by using data read from the neutron spectrum file. The neutron spectrum file (<tt>fluxes</tt>) contains a value of the first wall loading, e.g. 4.15 MW*m−2 . The energy integrated flux, e.g. 1.80 × 1015 n*cm−2*s−1, which is approximated by the sum of neutrons in all the groups, is calculated and equated to the wall loading during library processing. <br />
<br />
Note that it is the user’s responsibility to ensure that this wall loading is correct when the spectrum file is constructed. If a wall loading of 2.0 MW*m−2 was input then a flux value of (2.0/4.15) × 1.80 × 1015 n*cm−2*s−1 would be used in the calculations.<br />
<br />
'''WALL''' is a convenient alternative to using [[Keyword:FLUX | '''FLUX''']] for the irradiation of first wall materials, but great care must be exercised if it used for irradiations with other than first wall spectra. (In these cases the flux specified for the region must be that which would be present if the first wall loading shown in the file was present on the first wall.) It is recommended that '''FLUX''' is always used in preference to '''WALL''' unless the user has a run that makes its use essential.<br />
<br />
It should be noted that the wall loading describes the power that impinges on the first wall, ''not'' what is actually absorbed by it. In this sense the wall loading represents a convenient, but not fundamental, parameter. The power carried by the neutron flux impinging upon the first wall is related to the 14 MeV neutron current not flux. If one works out the heating power of 14 MeV neutrons it is found that a current ''C'', of 4.44 × 1013 n*cm−2*s−1 is equivalent to 1 MW*m−2. The relationship between 14 MeV neutron current and flux depends upon the source and first wall geometry and will vary from plant to plant.<br />
<br />
Example usage:<br />
<br />
< -- Control phase -- ><br />
...<br />
FISPACT<br />
* Title of the simulation<br />
< -- Initial phase -- > <br />
...<br />
WALL 3.0<br />
ATOMS<br />
< -- Inventory phase -- > <br />
TIME 1.0 HOURS<br />
WALL 0.0<br />
TIME 1.0 DAYS<br />
WALL 4.0 <br />
TIME 1.0 HOURS<br />
...</div>Michael Fleming