MCNP6.2 - SDEF on a RCC surface

[19matthew89]

TL;DR Summary

Error for SDEF source on RCC surface

Hi everyone,

I'm trying to set up a surface neutron source on the surface of a cylinder defined as a macrobody (RCC) and used also to define cell of the system. My aim is setting up a surface source where I'd like to give a specific spectrum (and DIR) at each surface defining the cylinder.

But, before getting so far, I simply tried to set up a monoenergetic source on the surface of the macrobody (see attachment). Unfortunately, the code gives me this fatal error: "fatal error sdef surface not valid surface" and I don't manage to understand why. In fact, the simulation runs smoothly if I simply replace the cylinder surface with a spherical surface. Aren't you allowed to define a surface source on a cylindrical surface? can you spot what the issue could be?Thanks in advance

 

[member38644]

for your help!

Hi there,

It is possible to define a surface source on a cylindrical surface in MCNP6.2. The error you are receiving may be due to an incorrect definition of the surface or a problem with your input file. I suggest double-checking your input file and making sure the surface is correctly defined as an RCC macrobody. You may also want to try running a simple test case with a monoenergetic source on a cylindrical surface to see if the issue persists.

If the problem persists, you can also try reaching out to the MCNP6.2 user community for assistance or contacting the developers for further support. They may be able to provide more specific guidance on troubleshooting this issue.

I hope this helps, and good luck with your simulation!