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Make sure one_group_xs works for threshold reactions

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This commit is contained in:
Paul Romano 2020-07-28 13:59:40 -05:00
parent b615070ad9
commit 0b4075ce8f
1 changed files with 18 additions and 8 deletions
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26
src/reaction.cpp
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@ -87,18 +87,28 @@ Reaction::Reaction(hid_t group, const std::vector<int>& temperatures)
double
Reaction::one_group_xs(gsl::span<const double> energy, gsl::span<const double> flux, const std::vector<double>& grid) const
{
// TODO: deal with threshold index
// TODO: Figure out how to deal with temperature
int i_temp = 0;
// Find index corresponding to first energy
double E_start = energy[0];
// TODO: Figure out how to deal with temperature
const auto& xs = xs_[0].value;
int i_low = lower_bound_index(grid.cbegin(), grid.cend(), energy[0]);
const auto& xs = xs_[i_temp].value;
int i_low = lower_bound_index(grid.cbegin(), grid.cend(), energy.front());
// Check for threshold and adjust starting point if necessary
int j_start = 0;
int i_threshold = xs_[i_temp].threshold;
if (i_low < i_threshold) {
i_low = i_threshold;
while (energy[j_start + 1] < grid[i_low]) {
++j_start;
if (j_start + 1 == energy.size()) return 0.0;
}
}
double xs_flux_sum = 0.0;
double flux_sum = 0.0;
for (int j = 0; j < flux.size(); ++j) {
for (int j = j_start; j < flux.size(); ++j) {
double E_group_low = energy[j];
double E_group_high = energy[j + 1];
@ -110,8 +120,8 @@ Reaction::one_group_xs(gsl::span<const double> energy, gsl::span<const double> f
// Determine bounding grid energies and cross sections
double E_l = grid[i_low];
double E_r = grid[i_low + 1];
double xs_l = xs[i_low];
double xs_r = xs[i_low + 1];
double xs_l = xs[i_low - i_threshold];
double xs_r = xs[i_low + 1 - i_threshold];
// Determine actual energies
double E_low = std::max(E_group_low, E_l);