What is the difference between FMESH and MESH in MCNP?

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FMESH and MESH serve different purposes in MCNP simulations. FMESH is utilized for tallying within a mesh that overlays the geometry, while MESH is primarily associated with variance reduction techniques. MESH is not necessary for mesh tallies but is involved in weight-window generation. Understanding these distinctions is crucial for effectively using MCNP for simulations. Clarifying these terms enhances comprehension of their respective roles in modeling.
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Difference between MESH card and FMESH card
Hi everyone,

I am struggling to understand the difference between FMESH and MESH.
FMESH is used to create a mesh superimposed with the geometry but...what does MESH? Is it only involved in weight-window generation and not needed for mesh tallies?

Thanks in advance for the clarification.
 
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I had a read and I'm pretty confident you are right. FMESH is a tally mesh, and MESH is a variance reduction mesh.
 
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