Search found 21 matches

by Siwei_Wang
28 Jun 2023, 07:56
Forum: Ring Tracking
Topic: Settings of new 'poisson' method in 'ion-effects'
Replies: 6
Views: 863

Re: Settings of new 'poisson' method in 'ion-effects'

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...
by Siwei_Wang
15 Jun 2023, 04:48
Forum: Ring Tracking
Topic: Settings of new 'poisson' method in 'ion-effects'
Replies: 6
Views: 863

Re: Settings of new 'poisson' method in 'ion-effects'

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...
by Siwei_Wang
06 Jun 2023, 02:30
Forum: Ring Tracking
Topic: Settings of new 'poisson' method in 'ion-effects'
Replies: 6
Views: 863

Re: Settings of new 'poisson' method in 'ion-effects'

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
by Siwei_Wang
05 Jun 2023, 10:58
Forum: Ring Tracking
Topic: Settings of new 'poisson' method in 'ion-effects'
Replies: 6
Views: 863

Settings of new 'poisson' method in 'ion-effects'

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...
by Siwei_Wang
19 Dec 2022, 11:46
Forum: General
Topic: Occasional errors while simulating ion-effects
Replies: 2
Views: 2411

Re: Occasional errors while simulating ion-effects

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...
by Siwei_Wang
07 Dec 2022, 06:25
Forum: General
Topic: Occasional errors while simulating ion-effects
Replies: 2
Views: 2411

Occasional errors while simulating ion-effects

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...
by Siwei_Wang
27 Oct 2022, 05:38
Forum: Ring Tracking
Topic: bigaussian method in ion-effects
Replies: 4
Views: 2419

Re: bigaussian method in ion-effects

Hi Joe, It seems for my case, the bi-lorentzian fit gives a result that looks a little better than bi-gaussian. The charge distribution looks more like a concave curve but the bigaussian gives a more convex curve. And the gaussian fit feels underestimated the charge distribution. Here are the three ...
by Siwei_Wang
21 Oct 2022, 04:16
Forum: Ring Tracking
Topic: bigaussian method in ion-effects
Replies: 4
Views: 2419

Re: bigaussian method in ion-effects

Hi Joe, Many thanks for the reply. This is also what I observed in my simulation, I did a case with a strong vacuum pressure which leads to strong ion instability. I tested the same case with both 'gaussian' and 'bigaussian', and the 'gaussian' gives a stable result while 'bigaussian' gives an obvio...
by Siwei_Wang
18 Oct 2022, 10:14
Forum: Ring Tracking
Topic: bigaussian method in ion-effects
Replies: 4
Views: 2419

bigaussian method in ion-effects

Hi, Recently I'm trying to simulate ion effects. When I changed the field_calculation_method from 'gaussian' to 'bigaussian', I encountered a huge increase in execution time, maybe 10 times slower. I'm using ILMATRIX and only one interaction point per turn, and macro_ions=1, it is already very slow....
by Siwei_Wang
02 Sep 2022, 03:44
Forum: General
Topic: Arbitary charge per bunch with arbitary macro-particles per bunch?
Replies: 3
Views: 3625

Re: Arbitary charge per bunch with arbitary macro-particles per bunch?

I'm facing the same problem. Recently I'm doing hybrid mode filling patterns and charge variation where each bunch have different charges. Now I have to use different number of particles to distinguish the charge difference, this is fine for a standard filling pattern where the charges of different ...