Abstract
The original paper contained a section describing two possible schemes for condensing channel averaged cross-section data from 32 to 3 groups. Each scheme envisaged a two stage process involving a condensation to an intermediate number of groups based on a relatively crude spectrum calculation followed by a second condensation to 3 groups using condensing spectra from a more refined calculation. The original purpose of the intermediate condensation was to remove redundant groups (e.g. groups around the Pu resonance that are of little importance in this analysis) as cheaply as possible. A crude 32 group 1-D or R-Z SNAP calculation would be used to provide spectra for a condensation to about 15 groups. This would be followed by a condensation from 15 to 3 groups using spectra from a refined multi cell WIMS calculation. An alternative, preferred approach enlarges the role of the intermediate condensation by performing a condensation to fewer groups, perhaps 9, using a better spectrum calculation than the SNAP scheme proposed above. The second condensation would then be from 9 to 3 groups. For this approach it is intended that the same type of spectrum calculation be performed at each stage, based on a multi cell WIMS model
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Citation Formats
Lancefield, M J.
A Wims E analysis of the zero energy experiments of Dragon prior to charge IV - Addendum to Part 1: The spectrum calculations. A note for discussion.
NEA: N. p.,
1973.
Web.
Lancefield, M J.
A Wims E analysis of the zero energy experiments of Dragon prior to charge IV - Addendum to Part 1: The spectrum calculations. A note for discussion.
NEA.
Lancefield, M J.
1973.
"A Wims E analysis of the zero energy experiments of Dragon prior to charge IV - Addendum to Part 1: The spectrum calculations. A note for discussion."
NEA.
@misc{etde_21180761,
title = {A Wims E analysis of the zero energy experiments of Dragon prior to charge IV - Addendum to Part 1: The spectrum calculations. A note for discussion}
author = {Lancefield, M J}
abstractNote = {The original paper contained a section describing two possible schemes for condensing channel averaged cross-section data from 32 to 3 groups. Each scheme envisaged a two stage process involving a condensation to an intermediate number of groups based on a relatively crude spectrum calculation followed by a second condensation to 3 groups using condensing spectra from a more refined calculation. The original purpose of the intermediate condensation was to remove redundant groups (e.g. groups around the Pu resonance that are of little importance in this analysis) as cheaply as possible. A crude 32 group 1-D or R-Z SNAP calculation would be used to provide spectra for a condensation to about 15 groups. This would be followed by a condensation from 15 to 3 groups using spectra from a refined multi cell WIMS calculation. An alternative, preferred approach enlarges the role of the intermediate condensation by performing a condensation to fewer groups, perhaps 9, using a better spectrum calculation than the SNAP scheme proposed above. The second condensation would then be from 9 to 3 groups. For this approach it is intended that the same type of spectrum calculation be performed at each stage, based on a multi cell WIMS model and differing only in the coarseness of the mesh. Possible mesh layouts for the multi cell WIMS calculations will be discussed in section 3. There is a consistency in this approach since the first multi cell WIMS mesh layout can be set up as a sub-set of the second multi cell WIMS map; consequently a good flux guess from the first calculation should be easily associated with the second calculation for re-start purposes. The method is also expected to be easier to execute than one based on two different models (i.e. SNAP and multi cell WIMS).}
place = {NEA}
year = {1973}
month = {Sep}
}
title = {A Wims E analysis of the zero energy experiments of Dragon prior to charge IV - Addendum to Part 1: The spectrum calculations. A note for discussion}
author = {Lancefield, M J}
abstractNote = {The original paper contained a section describing two possible schemes for condensing channel averaged cross-section data from 32 to 3 groups. Each scheme envisaged a two stage process involving a condensation to an intermediate number of groups based on a relatively crude spectrum calculation followed by a second condensation to 3 groups using condensing spectra from a more refined calculation. The original purpose of the intermediate condensation was to remove redundant groups (e.g. groups around the Pu resonance that are of little importance in this analysis) as cheaply as possible. A crude 32 group 1-D or R-Z SNAP calculation would be used to provide spectra for a condensation to about 15 groups. This would be followed by a condensation from 15 to 3 groups using spectra from a refined multi cell WIMS calculation. An alternative, preferred approach enlarges the role of the intermediate condensation by performing a condensation to fewer groups, perhaps 9, using a better spectrum calculation than the SNAP scheme proposed above. The second condensation would then be from 9 to 3 groups. For this approach it is intended that the same type of spectrum calculation be performed at each stage, based on a multi cell WIMS model and differing only in the coarseness of the mesh. Possible mesh layouts for the multi cell WIMS calculations will be discussed in section 3. There is a consistency in this approach since the first multi cell WIMS mesh layout can be set up as a sub-set of the second multi cell WIMS map; consequently a good flux guess from the first calculation should be easily associated with the second calculation for re-start purposes. The method is also expected to be easier to execute than one based on two different models (i.e. SNAP and multi cell WIMS).}
place = {NEA}
year = {1973}
month = {Sep}
}