Elegant users forum

Hi Michael and everybody, I am simulating orbit correction in a new lattice with strong quad and dipole gradients. I find that the orbit correction does not converge at all already for minuscule errors (5-10 micron rms). I have one BPM in each quad, and steerers in each sextupole. The set of element...

Hello everybody. Few basic questions about the inclusion of RF in a ring: 1) I am including "RFCA" elements in my lattice file (.lte), and I also turned on synchrotron radiation (and ISR=0). Is this enough to take into account synchrotron oscillations during particle tracking? Or, shall I use the "r...

Many thanks Michael. Cheers,
S.

And this is the lattice.

elettra_run1.ele Dear Michael, maybe I found the problem. Anyway, please find files in attachment. First I run elettra_run0.ele, then elettra_run1.ele. To my understanding, I am producing N-perturbed lattices (run0). Then I upload each of them in sequence and correct tunes, chromaticity, orbit. Fin...

Hello everybody, I have a ring (Elettra) including errors. I am able to correct trajectory, tunes and chromaticities. I am also able to optimize some coupling parameters (e.g., emittanceRatio). And I do this for a given set of error seeds (one random generator and, say, 100 runs). In order to make s...

You are right Michael, now it works and I have al positive elements on the diagonal of the sigmamatrix. Many thanks,
S.

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And here attached is my printout.
S.

OK Michael, I am attaching concise versions of my files, *.ele, *.lte, input settings file and printout of sigma matrix (*.rtf) for two cases, one for the bare lattice and below that, for the lattice perturbed by errors. The latter case is depicted by the Elegant files as they are. If you want to ru...

Hi Michael, still working with moments_output, now for optimization. First question. For the bare lattice, in which I use RF cavities, the moments_output command works well. For a perturbed lattice with errors, orbit and tune correction, Elegant says that the third mode is unstable (but the RF cavit...