- #1
Anisur Rahman
- 11
- 1
- TL;DR Summary
- MCNP Importance
MCNP -- What is meant by 2M and 20R?
- Thread starter Anisur Rahman
- Start date
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- Nuclear physics Radiation
In summary, "MCNP -- What is meant by 2M and 20R?" discusses the notation used in the MCNP (Monte Carlo N-Particle Transport Code) simulation software. The term "2M" refers to a two-dimensional geometry with a mesh, while "20R" denotes a specific type of tally or scoring method used in the software for radiation transport calculations. These notations help users understand the configuration and methodology applied in their simulations for accurate radiation analysis.
- #2
Alex A
Gold Member
- 318
- 211
Welcome to PF!
M I didn't know, but I and R are common. I means interpolate, R means repeat and M turns out to mean multiply.
So in any long list of numbers,
5 20M 20M
Would be the same as,
5 100 2000
and
7 8R
Would be the same as,
7 7 7 7 7 7 7 7 7
and
1 8I 10
Would be the same as,
1 2 3 4 5 6 7 8 9 10
(I think, I make a lot of off by one errors using I, it's not in your question but it saves soooo much effort writing tally bins you should know it)
M I didn't know, but I and R are common. I means interpolate, R means repeat and M turns out to mean multiply.
So in any long list of numbers,
5 20M 20M
Would be the same as,
5 100 2000
and
7 8R
Would be the same as,
7 7 7 7 7 7 7 7 7
and
1 8I 10
Would be the same as,
1 2 3 4 5 6 7 8 9 10
(I think, I make a lot of off by one errors using I, it's not in your question but it saves soooo much effort writing tally bins you should know it)
- #3
Anisur Rahman
- 11
- 1
Thank you so much!
FAQ: MCNP -- What is meant by 2M and 20R?
What does "2M" mean in the context of MCNP?
"2M" in MCNP typically refers to a specific tally multiplier used in the code. It is often used to denote a multiplier for energy depositions or particle fluxes, where "2M" might mean a factor of 2 million, depending on the context of the simulation and the specific units being used.
What does "20R" mean in the context of MCNP?
"20R" in MCNP usually refers to a specific tally result or a region identifier. The "R" could denote a region number in the geometry of the model, and "20" would be the specific region number. This is important for interpreting results and understanding where certain interactions or tallies are taking place.
How are "2M" and "20R" used in an MCNP input file?
In an MCNP input file, "2M" might be used in the context of defining a multiplier for a source or tally, whereas "20R" would be used to specify a region in the geometry section or in tally specifications. These terms help in setting up the simulation parameters accurately.
Can "2M" and "20R" be customized in MCNP simulations?
Yes, both "2M" and "20R" can be customized depending on the needs of the simulation. "2M" can be adjusted to different multipliers as required, and "20R" can refer to any defined region in the model. Users can specify these values in the input file to tailor the simulation to their specific requirements.
Why is it important to understand terms like "2M" and "20R" in MCNP?
Understanding terms like "2M" and "20R" is crucial for accurately setting up and interpreting MCNP simulations. These terms help in defining the parameters and regions within the simulation, ensuring that the results are meaningful and correctly correspond to the physical model being studied. Proper usage of these terms allows for precise control over the simulation environment and the results obtained.