Elegant users forum

Hi, I have a lattice file with a collimator defined as VS: rcol, XMAX=0.0001 in my .ele file I try to change XMAX via the alter command &alter_elements name = VS, item = "xmax" value = 0.001 &end and got the error message "Error: element VS does not have parameter xmax". I have vainly tried various ...

Michael,
Thank you. The signs are fixed but I am still just confused by the meaning of Sz0 and Sdelta0 are these the expected equilibrium bunch length and relative energy spread? Thank you, -- Philippe.

Hello, I was wondering what is the meaning of Ss0 and Sdelta0 and how they are computed in rf_setup. For the example attached I am puzzled as the rf_setup returns negative values for these two variables. Also, I am surprised by the magnitude of Sdelta [O(10**-10)] assuming there is just an issue wit...

Hello, In a CSRDRIFT located just downstream of the four )last) bend of a standard chicane, I noticed that the energy spread continuously increases with the stupackov=1 option (i.e. it does not seem to taper off). In fact, arbitrarily increasing the drift length results in a larger energy spread (if...

Hello Michael,
Actually, I was a bit too fast in my earlier reply. Inside a bunch compressor, the method does not work. because of the dispersion (then setting MX=0 mess up the compression) but I think it is OK as far as my problem is concerned. Best, -- Philippe.

Hello Michael, Thank you, this seems to do the job for now. I have one more favor would it be possible to have the longitudinal emittance in the sigmas files so to see its evolution along the beamline? This would be convenient. Right now I use sddsprocess $1.sig -define=column,ez,"Ss Ss * Sdelta * S...

Hello, Is there a way to run ELEGANT in a "LiTracK" fashion only looking at longitudinal dynamics? I naively thought imposing extremely low transverse emittance would do the trick. I basically want to force the transverse phase space to keep its zero emittance along the linac and only look at the lo...

Hi Michael, Thank you very much. It does work fine now. Out of curiosity how did you set up the phase and amplitude? Your number seems to be obtained from rf_setup Do you have already a version where rf_setup can handle alphac<0? If so would you be able to provide a patch so I could recompile ELEGAN...

Hi Michael, Indeed fixing the error your pointed out fixed my issues (sorry for missing these ones!). I can now track with canonical kick but still if I use a modified version of the synchrotron tune example I always observe some energy loss (for instance the attached plot show the evolution of the ...

Michael, All, I have converted some file from madx into elegant to simulate an electron ring in elegant and I encounter two problems I seems to no be able to solve. First I track particle through the ring (see tracking1.ele) and it works fine when I use the matrix elements. If I convert this lattice...