Elegant users forum

Dear Michael, By going through the source file of kicker.c. If I understand the logic correctly, it is lines from 104 to 223 that update the xp or yp from the kicker. From line 104 onward in the code, all particles' coordinates will be updated; Elegnat does not identify which bunch the particle is i...

The problem is related to the way the BUMPER element aligns the time coordinates of the beam to the time coordinates of the waveform. In particular, it computes <t> for the particles and aligns that to t=0 in the waveform file. If you center your waveform t data about t=0, you should get the result...

Hi Michael, Thanks a lot for you quick reply. Following your suggestion, I set up a new bumper as shown in the attached file. To clearly show how bumper kick different bunches. I set 2 watch element before and after the bumper and calculated the delta_Px and compare with the kicker strength set up i...

Hi, I am trying to simulate a fan-out kicker model by bumper. In the attached file. I set up a bunch train uniformly occupying the ring. 1. The initial bunch distribution is 80b_1MP_even.sdds 2. The Bumper file is set up as fan_kick.wf following a sine function, and inserted in the lattice. When the...

Hi Michael
Thanks a lot. I got it.

Chao

Hi, I am using touschek_scatter element to study the loss map as shown in the attached files. In the Pelegant*.out file, there is a message given as *------------------------------------- Program trace-back: error: It appears that the Touschek lifetime is extremely wrong and there is no need to perf...

Dear Michael, I am currently testing the bin-method in elegant to evaluate the space-charge forces. For benchmarking, I continue to use an unphysical model based solely on a one-turn matrix. In the simulation, only ILMATRIX + RF + SR + SC are included. To study the impact of bunch length, I set up t...

Dear Michael. Thanks for your explanation. I did a further comparison of tune-spared from elegant and CETASim. In elegant, still, it is a one-turn map and the space charge is set as 'nonlinear' The particle_tunes namelist is set as: &particle_tunes filename="<root>.nup", start_pid=1, end_pid=10000, ...

Dear Michael. I have checked the results from the new version of elegant, the results are shown here elegant_cetasim_para.png particle coordinates at the 5K turn. elegant_cetasim_cord.png After enough damping time, these two solvers show good agreement. Although there still exist discrepancies in th...

Dear Michael, Thank you for your quick reply. I understand now that when space-charge effects are included in the simulation, and one is interested in the emittance evolution over the tracking turns before reaching the final equilibrium state, it is essential that the initial beam be matched to the ...