How can I fix the illegal data signal error in my FMESH tally code in MCNP6?

In summary, to fix the illegal data signal error in your FMESH tally code in MCNP6, ensure that all input parameters are correctly defined, including mesh dimensions, boundaries, and tally types. Check for any typos or incorrect formats in your data. Additionally, verify that the mesh is properly aligned with the geometry and that no overlapping definitions exist. If issues persist, refer to the MCNP6 manual for specific guidelines on FMESH tally implementation and consider running a simpler model to isolate the problem.
  • #1
Marina123456
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0
Hi everyone, I would help in such problem. i have tried to use a fresh card, but it always gives an illegal data signal am using mcnp6. here is my fmesh code. thanks
FMESH44:n GEOM=X Y Z ORIGIN=-10 -10 -10
IMESH=-50 IINTS=5
JMESH=50 JINTS=11
KMESH=50 KINTS=8
EMESH= 1e-7 1 2
 
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  • #2
Hi, welcome to physicsforums,

If you can share your input or output files, renaming to add .txt will let you attach it to a post here. MCNP is very sensitive to formatting. Alternatively you can put the lines in bbcode CODE tags so the formatting is not lost.

A guess but you have "X Y Z" when maybe it should be "XYZ".
 
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FAQ: How can I fix the illegal data signal error in my FMESH tally code in MCNP6?

What causes the illegal data signal error in FMESH tally code in MCNP6?

This error often occurs due to incorrect or incompatible input parameters, such as mesh dimensions, tally specifications, or material definitions. It can also be caused by syntax errors or inconsistencies in the input file.

How can I debug my input file to fix the illegal data signal error?

Start by carefully reviewing the input file for any syntax errors or inconsistencies. Check the mesh dimensions, tally specifications, and material definitions to ensure they are correctly defined. Utilize MCNP6's built-in error messages and warnings to pinpoint the exact location of the issue.

Are there specific sections of the input file I should focus on to resolve this error?

Yes, pay close attention to the FMESH card and its associated parameters. Verify that the mesh grid, tally type, and any related variables are correctly defined. Also, ensure that any referenced materials or cells are properly specified in the input file.

Can software updates or patches help fix the illegal data signal error?

Yes, sometimes software updates or patches can resolve bugs or issues that may cause such errors. Ensure that you are using the latest version of MCNP6 and check for any available patches or updates from the developers.

Is there community or official support available for resolving this error?

Yes, you can seek help from the MCNP6 user community through forums, mailing lists, or official support channels. The MCNP6 documentation and user manuals can also provide valuable guidance. If the issue persists, consider reaching out to the developers or experienced users for assistance.

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