CEA Codes forum

Dear Lihaipeng,

I don't observe these differences, but I don't have your project files, so I need them to understand what you are doing. So, please, attach your project files (*.ini,*.dat) and your part_dtl1.dst file here, so that I am able to put myself in the same conditions as you.

Regards,

Didier

Didier,

I noticed the same promlem as Lihaipeng described:

"Normalized emittance is really different. In my previous example, Emit Xx is 0.3730797 in partran1.out, but in the dst file,the Emit Xx is 0.3724123".

The emittance is different in .dst file and partran1.out. The difference is quite small.

V2.23.3.4 on Win11.

Kinds,
shliu

Dear Shliu,

Same answer :

I don't observe these differences, but I don't have your project files, so I need them to understand what you are doing. So, please, attach your project files (*.ini,*.dat) and your part_dtl1.dst file here, so that I am able to put myself in the same conditions as you.

Regards,

Didier

I attached the project file.
At the exit of the lattice, Norm. RMS emit_Φ_W is 0.0379 π.deg.MeV in .dst file, while it is 0.03785602 in partran1.out.

Kinds,
shliu

And σ_φ=7.0231 deg in .dst, while it is 7.022882 deg in partran1.out file.

Dear shliu,

Using your example, I didn't get exactly your values!
But on my side, they're the same!
(see picture below)

Regards,

Didier

Dear Didier,

I end it at z=0.1 m before the dipole. After the dipole, it would be different:

DRIFT 0 50
DRIFT 100 50

EDGE 0 500 100 1e-009 1e-009 50 0
BEND 45 500 0 50 0
EDGE 0 500 100 1e-009 1e-009 50 0

DRIFT 200 50
end


Kinds,
shliu

Ok, you send me the wrong dat file.
Now I got like you.
Norm. RMS emit_Φ_W is 0.0379 π.deg.MeV in .dst file, while it is 0.03785602 in partran1.out

But in the end it's the same thing, it's just that in dst the format of the number displayed is limited to 3 digits after the decimal point, it is jsut rounded up!

Regards,

Didier

But σ_φ is different in my case:

σ_φ=7.0231 deg in .dst, while it is 7.022882 deg in partran1.out file.

Dear shliu,

Endeed, there is a difference which can be explained by a non-linear conversion present in the distribution display, which is an option activated by default and hidden.
You can now deactivate it in the page "Main" -> "Simulation options" -> "Non linear conversion"

You need to upgrade your code to access it

Regards,

Didier