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openmc-dev / openmc / 20470828925

23 Dec 2025 08:24PM UTC coverage: 81.898% (-0.04%) from 81.94%
20470828925

Pull #3550

github

web-flow
Merge b067e7f24 into 3f06a42ab
Pull Request #3550: [Point Detector] Add distribution get_pdf functionality

17078 of 23776 branches covered (71.83%)

Branch coverage included in aggregate %.

48 of 212 new or added lines in 13 files covered. (22.64%)

4 existing lines in 2 files now uncovered.

55208 of 64487 relevant lines covered (85.61%)

43370386.44 hits per line

Source File
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88.43
/src/chain.cpp
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//! \file chain.cpp
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//! \brief Depletion chain and associated information
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#include "openmc/chain.h"
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#include <cstdlib> // for getenv
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#include <memory>  // for make_unique
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#include <string>  // for stod
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#include <fmt/core.h>
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#include <pugixml.hpp>
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#include "openmc/distribution.h" // for distribution_from_xml
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#include "openmc/error.h"
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#include "openmc/reaction.h"
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#include "openmc/xml_interface.h" // for get_node_value
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namespace openmc {
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//==============================================================================
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// ChainNuclide implementation
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//==============================================================================
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ChainNuclide::ChainNuclide(pugi::xml_node node)
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{
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  name_ = get_node_value(node, "name");
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  if (check_for_node(node, "half_life")) {
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    half_life_ = std::stod(get_node_value(node, "half_life"));
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  }
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  if (check_for_node(node, "decay_energy")) {
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    decay_energy_ = std::stod(get_node_value(node, "decay_energy"));
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  }
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  // Read reactions to store MT -> product map
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  for (pugi::xml_node reaction_node : node.children("reaction")) {
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    std::string rx_name = get_node_value(reaction_node, "type");
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    if (!reaction_node.attribute("target"))
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      continue;
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    std::string rx_target = get_node_value(reaction_node, "target");
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    double branching_ratio = 1.0;
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    if (reaction_node.attribute("branching_ratio")) {
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      branching_ratio =
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        std::stod(get_node_value(reaction_node, "branching_ratio"));
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    }
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    int mt = reaction_type(rx_name);
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    reaction_products_[mt].push_back({rx_target, branching_ratio});
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  }
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  for (pugi::xml_node source_node : node.children("source")) {
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    auto particle = get_node_value(source_node, "particle");
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    if (particle == "photon") {
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      photon_energy_ = distribution_from_xml(source_node);
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      break;
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    }
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  }
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  // Set entry in mapping
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  data::chain_nuclide_map[name_] = data::chain_nuclides.size();
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}
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ChainNuclide::~ChainNuclide()
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{
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  data::chain_nuclide_map.erase(name_);
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}
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//==============================================================================
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// DecayPhotonAngleEnergy implementation
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//==============================================================================
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void DecayPhotonAngleEnergy::sample(
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  double E_in, double& E_out, double& mu, uint64_t* seed) const
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{
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  E_out = photon_energy_->sample(seed);
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  mu = Uniform(-1., 1.).sample(seed);
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}
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double DecayPhotonAngleEnergy::sample_energy_and_pdf(
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  double E_in, double mu, double& E_out, uint64_t* seed) const
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{
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  E_out = photon_energy_->sample(seed);
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  return 0.5;
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}
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//==============================================================================
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// Global variables
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//==============================================================================
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namespace data {
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std::unordered_map<std::string, int> chain_nuclide_map;
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vector<unique_ptr<ChainNuclide>> chain_nuclides;
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} // namespace data
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//==============================================================================
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// Non-member functions
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//==============================================================================
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void read_chain_file_xml()
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{
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  char* chain_file_path = std::getenv("OPENMC_CHAIN_FILE");
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  if (!chain_file_path) {
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    return;
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  }
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  write_message(5, "Reading chain file: {}...", chain_file_path);
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  pugi::xml_document doc;
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  auto result = doc.load_file(chain_file_path);
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  if (!result) {
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    fatal_error(
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      fmt::format("Error processing chain file: {}", chain_file_path));
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  }
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  // Get root element
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  pugi::xml_node root = doc.document_element();
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  for (auto node : root.children("nuclide")) {
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    data::chain_nuclides.push_back(std::make_unique<ChainNuclide>(node));
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  }
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}
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} // namespace openmc
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