Elegant users forum

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 ...

Dear Michael, Many thanks for your reply. I checked the data of transmission in this simulation, and there is no particle loss. Meanwhile, I did a simple scan on beam current from 0.1 mA to 1mA, the results is shown below elegant_currScan.png There are two groups of curves, each including 10 (0.1 mA...

Dear Michael, I am studying space-charge effects in rings and would appreciate your advice on a surprising result from an element-by-element tracking test. I attached the input file that shows how I set up the simulation. In the run I apply a space-charge kick at every quadrupole (element-by-element...

Dear Michael, Thanks for your quick reply. What I am trying to simulate is the rf-noise and rf-feedbacks in the mode element. The purpose is to know if the feedback can follow the rf-noise and maintain the cavity voltage. In the simulation, the filling pattern is set as 3840=80*(1bunch+47gap), which...

Hi,

I would like to simulate the influence on beam from the generator current (Ig) noise, together with the rf-feedbacks.
Is there any example showing how to set the generator current noise in rf mode element?

yours Chao

Hi Michael, Recently, I am trying to ramp the beam current from a certain value to zero to check the cavity response. In the simulation, I set 80 bunches, given in train_80b_1KPerBunch_even.sdds and each bunch has 7.6nC charge initially In the output of ramp_element, ramp.sdds, the total charge is r...

Hi, This is Chao. Recently, I am trying to do some study on space-charge effect with elegant. My question is simple: Can the space-charge effect be simulated with ILMATRIX (one-turn map) by elegant? I tried this method, however, it seems like the results given out are not as I expected. Looking forw...