- #1
Anisur Rahman
- 15
- 1
- TL;DR
- Source Specification Details
What is the physical significance of WGT and SBn in MCNP source specifications?
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SUMMARY
The discussion focuses on the physical significance of WGT and SBn in MCNP source specifications, particularly in relation to variance reduction techniques. WGT is integral to the "weight window game," which optimizes particle transport simulations. The parameters SI1 and SP1 define energy distributions for particles, while SBn can be disregarded for beginners. Understanding these concepts is crucial for effectively utilizing MCNP for advanced simulations.
PREREQUISITES- Familiarity with MCNP (Monte Carlo N-Particle Transport Code)
- Understanding of variance reduction techniques in particle transport simulations
- Knowledge of particle energy distribution functions
- Basic grasp of source specification parameters in MCNP
- Research the "weight window game" in MCNP for variance reduction strategies
- Explore the use of energy distribution functions in MCNP simulations
- Learn about defining source points and directions in MCNP
- Study advanced MCNP source specification parameters and their applications
Researchers, physicists, and engineers working with MCNP simulations, particularly those focused on optimizing particle transport and variance reduction techniques.
- #2
Alex A
Gold Member
- 385
- 266
It's sometimes better to look at examples than to read the manual. The full spec often contains a lot of rarely used options. WGT and SBn are closely tied to variance reduction and what is called "The weight window game". If you don't know what the weight window is don't tackle this yet.
That syntax quoted creates a source at a point x,y,z of some kind of particle with energy picked from a distribution D1. The distribution is defined by the parameters in SI1 and SP1 (and SB1 but you can ignore this one for now). The distribution could be a series of bins with the probability of each or a smooth function with a random number as the input.
If a second distribution is needed, D2, that would have SI2 and SP2 etc
Distributions are very powerful and you can also use them to control the source points or direction of the particles. For example if you want the source to be a line or a solid cylinder or sphere feeding the right distributions into the available position variables is usually how that is done.
That syntax quoted creates a source at a point x,y,z of some kind of particle with energy picked from a distribution D1. The distribution is defined by the parameters in SI1 and SP1 (and SB1 but you can ignore this one for now). The distribution could be a series of bins with the probability of each or a smooth function with a random number as the input.
If a second distribution is needed, D2, that would have SI2 and SP2 etc
Distributions are very powerful and you can also use them to control the source points or direction of the particles. For example if you want the source to be a line or a solid cylinder or sphere feeding the right distributions into the available position variables is usually how that is done.
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