MCNP: SRCTP file with KCODE card

[neutrino45]

Hey,

I'm modeling the criticality of a core for a university project using MCNP4C. I've run the core on the appropriate KCODE parameters, specifying the source using the KSRC card, and I was looking to cut down on the computing time using the SRCTP files.

My problem is that I can't find anywhere in the manual or online that describes how you go about using the SRCTP files. I am aware that you can use the RUNTP files in a continue run, however I want to compare similar but not identical cores, so this is not that useful.

Does anyone know the correct format or syntax for replacing the KSRC card with a SRCTP file?

Thanks

 

[MCNPX]

You need to remove KSRC card and provide additional parameter in the execution command:

mcnp4c n=myinput srctp=mysrctp

Some MCNP4C-based codes have SRCTP card which you can use instead of KSRC for the same thing. MCNPX has currently very confusing error messages if you just skip KSRC card and do not use the extra parameter, so if it cannot find the existing srctp file - just add the parameter. One can also specify the parameter in the MESSAGE block of input file if you find it more convenient.

Hey,

I'm modeling the criticality of a core for a university project using MCNP4C. I've run the core on the appropriate KCODE parameters, specifying the source using the KSRC card, and I was looking to cut down on the computing time using the SRCTP files.

My problem is that I can't find anywhere in the manual or online that describes how you go about using the SRCTP files. I am aware that you can use the RUNTP files in a continue run, however I want to compare similar but not identical cores, so this is not that useful.

Does anyone know the correct format or syntax for replacing the KSRC card with a SRCTP file?

Thanks

 

[raining Pete]

Hi there,

I'm not too familiar with MCNP4C, but I did some research and it looks like the SRCTP files are used to specify the source points and their respective intensities in a Monte Carlo simulation. From what I could find, it seems like the format for the SRCTP file is similar to the KSRC card, but with some additional parameters.

Here's an example of what the SRCTP file format might look like:

SDEF POS=0 0 0 PAR=1 ERG=D1 DIR=COS
SP1 1
SP2 2
SP3 3
SP4 4
SP5 5

In this example, the source is defined at the origin (0 0 0) with a particle type of 1 (neutron) and an energy distribution of D1 (continuous energy distribution). The direction of the particles is specified as cosine distribution. The following lines (SP1-SP5) would then list the source points and their respective intensities.

I hope this helps, but I would recommend checking with someone who has more experience with MCNP4C to confirm the correct format for your specific simulation. Best of luck with your project!