Elegant users forum

I'm wondering exactly how Elegant simulates quads. It looks like it's a thin-lens approximation, since there are no integration steps and the documentation says it's a matrix. If this is the case, how are fringe fields simulated? It seems like there's a reference I should know about, but don't.

Joel,

The QUAD element is a standard thick-lens matrix treatment. See, for example, SLAC-75 Equation 55. You can include linear fringe effects with the FFRINGE parameter, which is described a little bit in the manual at
http://www.aps.anl.gov/Accelerator_Syst ... de150.html

This is also a matrix treatment, assuming a pure quadrupole field ramps linearly from zero to full strength over a defined distance.

The KQUAD element is a canonical thick-lens treatment. If does not include fringe effects, but will in a future release.

--Michael

Oh, that would be a mis-statement, I did mean thick-lens. Thanks, I didn't know about the linear fringe effects. It makes so much more sense now!