Elegant users forum

Takahiro,

I think the source of the confusion is that the output files from CSRCSBEND shows the change in Gamma for the most recent slice of the dipole. Therefore, if you have N_KICKS=100, you'd see DeltaGamma of about 1% of what you might expect.

--Michael

Pete, My guess about the source of the vertical emittance growth is chromatic aberrations from the quadrupoles. The emittance growth scales like sigma_y^2*sigma_delta/f, where f is the focal length. So better control of the vertical beamsize at strong quads will help. Elegant computes emittances as ...

Shancai, I don't think there is anything wrong with your kicker settings. The problem is that you have strong sextupoles inside the bump. As the kickers fire, they kick the stored beam a t=0, t=0.22 us, t=0.44us, etc. However, the bump is matched only for t=0.5 us (full amplitude), because of the se...

If you just want to specify fixed scales, try the -scales option, e.g.,

sddsplot -column=s,betax -scales=0,0,0,30

would plot betax between 0 and 30, but autoscale on y.

Let me know if this isn't why you are trying to do.

--Michael

Pete,

Try this:

sddsplot -column=s,LinearDensity BC2-MAG-DIPOLE-04.CSR -split=pages -graph=line,vary -order=spectral

--Michael

Weiming, You can do this with load_parameters. Just give a file with a string column called ParameterStringValue instead of the usual ParameterValue column. An even easier way is using alter_elements, e.g., &alter_elements name=*, type=KQUAD, item=systematic_multipoles, string_value=<filename> &end ...

James, Just a word on the use of smoothDist6: it is best used for determining the microbunching gain curve of the system. Because of the algorithm used, some of the detailed correlations among various phase space coordinates will get lost. If you just want to increase the number of particles without...

Weiming, This is a somewhat confusing issue. Basically, you shouldn't set ON_PASS to any value for this simulation. Leave it at the default value of -1. Elegant interprets this as meaning, for matrix and twiss parameter computations, that you want to simulate a beam that is permanently displaced to ...

James,

It should be part of the installation. Try typing "smoothDist6s". If not, you can try install the attached script.

--Michael

Chris, This can be done with either an ENERGY or a MALIGN element. Which you use is just a matter of convenience. Using the MALIGN element, you'd set DP equal to the fractional momentum offset of the beam relative to the design momentum. Using the ENERGY element, you can redefine the reference momen...