Elegant users forum

Dear Michael,

Many thanks for your reply. Now it is clear to me!

Kind regards,
Siwei

Dear Michael, Many thanks for your help regarding setting the MRFDF element to simulate the time-variant quadrupole. It works well for me. During the simulation, I met another question, i.e., the unit of B2 in MRFDF is V/m2, I'm a bit curious how it is connected with the K value of the quadrupole. M...

Hi Michael,

Many thanks for your reply. MRFDF works for me!

Best regards,
Siwei

Dear Michael, Recently I'm trying to do a simulation of the coupled-bunch effects with a time-variant quadrupole in the lattice. The quadrupole strength varies in a harmonic of the revolution frequency to introduce a bunch-by-bunch tune spread that aims to cure coupled-bunch instability. My first id...

Hi Joe, Thanks for your reply. My previous result was already using 100 macro_particle, and 128 poisson bins for both horizontal and vertical. That filling pattern was a hybrid filling pattern with 1 train, 100 half bucket gap. Following your advice, I tried another hybrid filling pattern case ( 2 t...

Dear Joe, I did some benchmarking of different 'poisson' setup parameters with my previous result using 'bilorentzian'. It seems with different filling patterns, sometimes the ion effects from 'poisson' method is more stable and sometimes 'bilorentzian' is more stable. But I observed some interestin...

Hi Joe,

Many thanks for your reply. I'll try more cases with different number of bins. It's a good thing that 'poisson' method is closer to measurement result, it will save more execution time for ion simulation for future studies.

Regards,
Siwei

Hi there, Recently I noticed that the newest elegant 2023.2 has the new ‘poisson’ method in ‘ion-effects’. I did several tests with different settings of ion_span and ion_poisson_bins. When I set the ion_span to 10 times the beam sigma and ion_poisson_bins to 128, the simulation goes much faster tha...

Dear Soliday, I seems to find a way of overcoming this problem. Currently in my pressure file, I have only two lines of data corresponding the start and end of the lattice. After I duplicate the pressure data in some middle points, making 11 lines of the total data, it seems the problem is gone. I c...

Dear all, When I run ion-effects simulation, sometimes I encounter the following errors: *** Error in `/dls/physics/wsw/ELEGANT2022/2022/bin/Pelegant': realloc(): invalid old size: 0x0000000001c48870 *** ======= Backtrace: ========= /lib64/libc.so.6(+0x7f474)[0x2ac4b92f6474] /lib64/libc.so.6(+0x8486...