Elegant users forum

Weijie, You need to use "M2#1.betax" instead of "M2.betax". The reason is that elegant allows multiple instances of the marker M2 in the beamline, so you have to tell it which one to use (even when there is in fact only one). Another problem is here: &optimization_term term = "20 betax betay - sqr +...

I think the problem is just that you set X_DRIVE_EXPONENT=0. That means that the horizontal wake is a monopole wake, so that there is a kick in the x plane regardless of x position. If you want to turn off the horizontal wake, set XFACTOR=0

--Michael

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--Michael

Zhenbiao, I've never used LiTrack, but I think the sign convention for R56 is the opposite of elegant's. Usually in elegant we define the bunch compressors explicitly using bending magnets. However, it is possible to use the EMATRIX element to simulate a matrix defined by the matrix elements. An exa...

Mikhail,

Please see the attached example. It converges in four iterations.

--Michael

Samira, The problem seems to be that your field file does not define a quadrupole magnet. To check this, I computed dBy/dx at y=0 and dBx/dy at x=0 as a function of z. sddssort fieldmap300.sdds -pipe=out -col=z -col=x -col=y | sddsbreak -pipe -change=z | sddsprocess -pipe -filter=col,y,-1e-6,1e-6 -p...

Minghao, Setting fiducialize=1 is recommended if you are performing one-pass momentum aperture in a system with large energy losses or gain. An example is a linac. For storage rings, it should be zero. soft_failure is used to control what happens when the momentum acceptance is not found one or more...

Mikhail,

The ability to perform (delta, x) and (delta, y) aperture finding will appear in the next release.

Thanks for the suggestion.

--Michael

Mikhail, I think the only way you can get what I understand you are looking for is to use something other than line-search mode. By definition, line-search mode searches along lines starting from the origin. The radial spacing along the lines is xmax/nx. You can always reduce nx if you want finer st...

Philippe,

The reason that happens in Pelegant is that the master processor is "non-working." It handles coordination among the slave processors, but (usually), doesn't do anything related to particle generation or tracking.

I'll add a check to the code for this problem.

--Michael