Elegant users forum

Hi,

This is Chao. Recently, I am trying to do some study on space-charge effect with elegant.
My question is simple: Can the space-charge effect be simulated with ILMATRIX (one-turn map) by elegant?

I tried this method, however, it seems like the results given out are not as I expected.
Looking forward to your reply and many thanks.

Yours Chao

Chao,

I wouldn't expect space-charge simulation to work well with ILMATRIX. The space-charge kicks depend on the beam size, which varies with position in the ring. Also, the kicks from various locations will add or subtract depending on the phase advance.

If you have a large periodic ring, you might get acceptable results by using an ILMATRIX element for each cell. However, the reliability needs to be assessed using element-by-element tracking for these simulations.

--Michael

Dear Michael,

I understand your concerns. For a realistic study in electron rings, it has to be element-by-element tracking.

The reason why I asked is because of the simulation of a linear one-turn map together with the space charge effect
1. perfect case for benchmark purposes.
2. perfect case to show how the space-charge effect changes the dynamics.

Actually, I also put a space charge solver in the code I am developing, unfortunately, it is still linear-optics-based tracking.
However, we still observed that the emittance growth is very different if the number of space charge kicks are applied.
Then, later, I think it would be nice to have at least one case to be benchmared with elegant results, and then one-turn-map tracking method
come up.

Yours Chao