Extracting batch-wise tallies

Bamsdee · November 6, 2023, 5:16pm

Hi,

I want to capture the tally from each batch. I think currently the successive/consecutive batches are cumulative of the previous batches. How can I get the tally mean from a batch that is normalized to the number of neutrons in that batch only and is not combined with tally results of preceding batches?

Regards,
Bamidele

Shimwell · November 6, 2023, 5:56pm

Hi Bamidele

Here is an example that uses openmc.lib to iter the batches and extract a tally each time. Perhaps code block 9 is the most relevant part for you

github.com

fusion-energy/neutronics-workshop/blob/main/tasks/task_13_variance_reduction/4_sphere_iterative_per_batch_ww.ipynb

{
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  {
   "attachments": {},
   "cell_type": "markdown",
   "id": "db6c76be-284f-4355-88aa-b4c89b9bbcea",
   "metadata": {},
   "source": [
    "This example has a sphere of concrete with a second smaller shell of concrete\n",
    "surrounding the sphere.\n",
    "\n",
    "The first simulation is analog with no variance reduction / weight windows.\n",
    "This simulation shows that not many neutrons get to the shell and the \n",
    "consequently the neutron spectra on the shell cell is unresolved. Additional\n",
    "batches improve the neutron spectra but it is clear that it would take many\n",
    "batches to get a reasonable neutron spectra.\n",
    "\n",
    "The second simulation makes use of a variance reduction method called weight\n",
    "windows. The value of the weight windows is assigned using the MAGIC method.\n",
    "https://scientific-publications.ukaea.uk/papers/application-of-novel-global-variance-reduction-methods-to-fusion-radiation-transport-problems/\n",

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Bamsdee · November 6, 2023, 6:14pm

Hi Shimwell,

Thank for you response.
It think (correct me if I’m wrong please) each time the tally is extracted here, the tally has been accumulated over the number of batches. I would like to get the tally mean for each batch (not accumulated over the batches).

Regards,

Shimwell · November 6, 2023, 6:45pm

Hi Bamidele

You are right about that. You could add a lib reset to clear out the existing tally resuts

All the best

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Extracting batch-wise tallies

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