Elegant users forum

Hello,
I am simulating a bunched beam with sigma_dp = 0.001, but respect to my data it's not the same.
In fact, I would like to have an asymmetric sigma_dp (an asymmetry on the left side of my gaussian simulation) to have a better agreement with my data.
Is it possible? If yes, how can I modify my elegant file?
Thank you in advance,
Silvia

Silvia,

You can use the program sddssampledist to generate an arbitrary momentum distribution outside of elegant, then load the particles via the sdds_beam command.

Let's assume that your beam is gaussian in (x, xp, y, yp, t), but has a different distribution in momentum. The procedure to generate this beam would be

1. Run elegant to make a nominal distribution of particles.
2. Throw out the unwanted p coordinates.
3. Generate new p coordinates by sampling a desired distribution (sddssampledist).
4. Merge with other coordinates.

The attached archive has a concrete example.

--Michael

Silvia,

There are also several examples in the the elegant examples file, under customBeamDistributions.

--Michael