Elegant users forum

Dear all,
I intend to track the electron bunch in storage ring with IBSCATTER element to simulate the IBS effect. I want to know that:How to bring in coupling(emit_y/emit_x) in the lattice ？I found the element SREFFECTS has a Parameter Name：COUPLING
if I set the COUPLING=0.01，is it that during the particle tracking,the parameter of electron bunch from WATCH element emit_y/emit_x keep 0.01? The attached files was the example I used for IBSCATTER.I think I should get the same result as

https://jacowfs.jlab.org/conf/y15/ipac1 ... PMA012.PDF
but the variation of the vertical emittance is strange,Is there any way I could do in the example?


Thanks in advance!
Tiansk

Dear all,

The attached file is the result of particle tracking with IBSCATTER and SREFFECTS(COUPLING=0.01),the emittance of y direction is not growing so much! If using the ibsEmittance command,the final emittance_y/emittance_x will be equal with the coupling factor.Should I add some tilt bends or quads in the lattice？

Thanks in advance!
Tiansk

Dear all,
I am asking a very similar question of Tiansk: the agreement of ibsEmittance and tracking results on the horizontal emittance is fine. Instead, tracking does not reproduce the vertical emittance growth predicted by ibsEmittance. I also tried to include coupling sources in the lattice through quad roll errors, without success.
Any help to fix it? I am attaching elegant files and plots.
Thank you in advance,
Simone

p.s.: in order to enhance the IBS effect, the bunch charge was made huge, but this does not change the situation.

Dear all:

When using IBSCATTER to simulate the IBS effect, there is a parameter called SMOOTH in IBSCATTER. I believe that setting SMOOTH to 1 or 0 may result in different paths for the variation of beam parameters, but the final equilibrium state should be relatively consistent. However, after comparing the results with different SMOOTH settings, I found that the beam equilibrium state parameters differ significantly, as shown in the attached files. How can this be explained?


Thank you in advance,
Tiansk

The change in the vertical emittance is shown in the figure below.