Search found 18 matches

by A.V.Bogomyagkov
16 Feb 2022, 22:27
Forum: Momentum Aperture
Topic: Discrepancy between momentum aperture and Touschek
Replies: 3
Views: 3104

Re: Discrepancy between momentum aperture and Touschek

Thank you, Michael, It is puzzling. I read sdds files into python pandas and plot them. The difference is obvious. I also converted sdds files into ascii (both files are in the new attachment) sddsconvert -ascii results/ct_ring.tlife results/ct_ting.tlife.ascii sddsconvert -ascii results/ct_ring.mma...
by A.V.Bogomyagkov
14 Feb 2022, 00:42
Forum: Momentum Aperture
Topic: Discrepancy between momentum aperture and Touschek
Replies: 3
Views: 3104

Discrepancy between momentum aperture and Touschek

Hello, I calculated momentum aperture, ibs emittances with ibsEmittance and Touschek lifetime with touschekLifetime. Then I plotted momentum aperture and square root of tmP and tmN, which look different from momentum aperture on attached figure. The difference is clearly visible while comparing the ...
by A.V.Bogomyagkov
07 Feb 2022, 01:53
Forum: General
Topic: lattice file conversion from MAD-X to ELEGANT?
Replies: 6
Views: 4062

Re: lattice file conversion from MAD-X to ELEGANT?

Gunn Tae, I convert MAD-X sequences into ELEGANT by using mad8 key in save command of MAD-X seqedit, sequence=ct_ring; flatten; endedit; set,format="28.15g"; select,flag=save,clear; use,sequence=ct_ring; save,sequence=ct_ring,file="ctau_tmp.madx",noexpr; call,file="ctau_tmp.madx"; //Needed to have a...
by A.V.Bogomyagkov
31 Mar 2021, 22:55
Forum: Parallel Elegant
Topic: An error with parallel optimization
Replies: 11
Views: 16327

Re: An error with parallel optimization

Michael, could it be that during optimization stability was completely lost, i.e. DaArea=0, and optimization algorithm (simplex) just could not make a step back where aperture existed or makes a step back and the next step again takes it to the same bad point. Therefore, optimization algorithm is st...
by A.V.Bogomyagkov
17 Mar 2021, 22:41
Forum: Parallel Elegant
Topic: An error with parallel optimization
Replies: 11
Views: 16327

Re: An error with parallel optimization

Hello, I tried to run Pelegant on ОС: Scientific Linux 7.9 Linux en002.binp.gcf 3.10.0-1160.15.2.el7.x86_64 #1 SMP Tue Feb 2 08:13:55 CST 2021 x86_64 x86_64 x86_64 GNU/Linux MPI: openmpi-1.10.7-5.el7.x86_64 openmpi-devel-1.10.7-5.el7.x86_64 The result is same. elegant run-da-opt-4d.ele > results/run...
by A.V.Bogomyagkov
02 Mar 2021, 23:14
Forum: Parallel Elegant
Topic: An error with parallel optimization
Replies: 11
Views: 16327

Re: An error with parallel optimization

Michael,

I tried on linux ubuntu.
Here is a screenshot of the error message image.png
and the log and output files

Anton
by A.V.Bogomyagkov
02 Mar 2021, 01:36
Forum: Ring Tracking
Topic: Tune versus delta
Replies: 5
Views: 5060

Re: Tune versus delta

Thank you Michael.

Anton
by A.V.Bogomyagkov
01 Mar 2021, 22:24
Forum: Ring Tracking
Topic: Tune versus delta
Replies: 5
Views: 5060

Re: Tune versus delta

Michael, The linear dispersion is zero, but nonlinear is not. I am a newbie with elegant and trying to understand. And I was wondering if my conclusion is valid. The coordinate shift from tracking corresponds to x=d1*delta^2. Can you advise on how to optimize 5d or 6d DA? Optimization of tunes varia...
by A.V.Bogomyagkov
26 Feb 2021, 04:33
Forum: Parallel Elegant
Topic: An error with parallel optimization
Replies: 11
Views: 16327

Re: An error with parallel optimization

Michael, I tried what you explained and pelegant started with 16 processes, found initial DA, and just froze during optimization as it seen in resource monitor (Screenshot 2021-02-26 162353.png) and results/run-da-opt-4d.log mpiexec -n 16 pelegant run-da-opt-4d.ele > results/run-da-opt-4d.log with &...
by A.V.Bogomyagkov
25 Feb 2021, 23:32
Forum: Parallel Elegant
Topic: An error with parallel optimization
Replies: 11
Views: 16327

Re: An error with parallel optimization

Thank you Michael, now it is clear. What can you advise about following. I want to optimize 5d dynamic aperture, which is transverse DA at fixed energy deviations. Can you advise how to do it, because "find_aperture" only finds DA for on momentum particle. The other way is to find the aperture in x ...