CEA Codes forum

Dear Dr. Didier, sorry about several question in these days.

I did an RFQ error study with TRACEWIN and Toutatis then I got a result.
In the tendency of the error study result, it looks like there is no problem but I'm wondering about the '0 case'.

The first attachment is my error study setup and the second photo is the result of input beam scan for x axis from -2mm to 2mm.
It looks like tendency is okay but I don know why the value at x=0 is not 0.

If I export the data at X=0 case it looks like below.
Step Ɛxx' Ɛyy' Ɛzz' Losses
0.0000000000e+00 -5.8342840000e-01 2.9961060000e-02 1.0375200000e+00 -1.3156540000e-01

I think the simulation result at x=0 is used as reference data so I think it must become '0' because I set the beam reference as output.

Does 'Do stat on 0 case' option affects to this kind of thing?

I suspect that the additional simulation for '0' case run with different random seed for initial distribution.
I use the froze random seed option but I'm not sure what kind of thing is happened inside of simulation.

Best Regards.

SeokHo Moon

Dear SeokHo Moon,

Yes, I can confirm that for this type of analysis, scan, the "Do stat on 0 case" option doesn't matter.
Indeed, I discovered a small problem with the 0 point which was recalculated and compared with the initial simulation, thus causing the eccarts that you are observing because the initial distribution is not the same. I have corrected this in the latest version available online.

Regards,

Didier

Dear Dr.Didier

Thank you very much Dr. Didier, I will waiting for the latest version.

Best Regards
SeokHo Moon

Dear SeokHo Moon,

The corrected version is already available

Regards,

Didier