Module sampling 

Walker/Vose alias-table source sampling.

AliasTable implements Walker’s method with Vose’s construction (Wuttke 2013), including the reverted small/large index ordering and the prob == 1 drain for numerically degenerate leftovers. MeshSourceSampler applies it to MeshTallyData: ANALOG samples the (volume-weighted) tally totals, UNIFORM samples space uniformly, and USER consumes an external density array. Only voxel-level sampling is provided; subvoxel/cell-fraction modes are out of scope.

Structs

AliasTable

Walker/Vose alias table over a discrete PDF.

MeshSourceSampler

Mesh source sampler over MeshTallyData energy-integrated totals.

SampledVoxel

One sampled particle birth site (voxel resolution).

Enums

Mode

Source-sampling bias mode (values 0–2 at voxel level).