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Posted: **Thu 4 May 2023 13:13**

Dear Didier,

When I plot the beam envelope in 'Envelope' mode, it looks like the envelope does not contain the dispersion effect. But in 'Partran' mode, the dispersion effect is shown in the envelope.

So, does the envelope contain the dispersion effect (in "Envelope" mode) ？Or, how to enable it?

Posted: **Thu 4 May 2023 16:19**

Dear Zhao,

The dispersion effect shown in the partran is due to input energy spread you have defined to 0.6 MeV. In envelope mode, your beam iis defined as CW, no spread can be considered.

: spread.png (4.67 KiB) Viewed 6544 times

If you want to have something similar you have to defined beam like following picture. Its not exactly the same input energy spread, but by this way envelope and teacking will be the same.

: spread2.png (4.13 KiB) Viewed 6544 times

: input_twiss.png (11.64 KiB) Viewed 6544 times

Regards,

Didier

Posted: **Fri 5 May 2023 10:21**

So it is. Thank you.

Best regards

CEA Codes forum

Dose the envelope contain the dispersion effect？

Dose the envelope contain the dispersion effect？

Re: Dose the envelope contain the dispersion effect？

Re: Dose the envelope contain the dispersion effect？