Search found 18 matches
- 16 Feb 2022, 22:27
- Forum: Momentum Aperture
- Topic: Discrepancy between momentum aperture and Touschek
- Replies: 3
- Views: 9321
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...
- 14 Feb 2022, 00:42
- Forum: Momentum Aperture
- Topic: Discrepancy between momentum aperture and Touschek
- Replies: 3
- Views: 9321
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 ...
- 07 Feb 2022, 01:53
- Forum: General
- Topic: lattice file conversion from MAD-X to ELEGANT?
- Replies: 6
- Views: 7780
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...
- 31 Mar 2021, 22:55
- Forum: Parallel Elegant
- Topic: An error with parallel optimization
- Replies: 11
- Views: 26467
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...
- 17 Mar 2021, 22:41
- Forum: Parallel Elegant
- Topic: An error with parallel optimization
- Replies: 11
- Views: 26467
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...
- 02 Mar 2021, 23:14
- Forum: Parallel Elegant
- Topic: An error with parallel optimization
- Replies: 11
- Views: 26467
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
I tried on linux ubuntu.
Here is a screenshot of the error message image.png
and the log and output files
Anton
- 02 Mar 2021, 01:36
- Forum: Ring Tracking
- Topic: Tune versus delta
- Replies: 5
- Views: 6038
Re: Tune versus delta
Thank you Michael.
Anton
Anton
- 01 Mar 2021, 22:24
- Forum: Ring Tracking
- Topic: Tune versus delta
- Replies: 5
- Views: 6038
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...
- 26 Feb 2021, 04:33
- Forum: Parallel Elegant
- Topic: An error with parallel optimization
- Replies: 11
- Views: 26467
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 &...
- 25 Feb 2021, 23:32
- Forum: Parallel Elegant
- Topic: An error with parallel optimization
- Replies: 11
- Views: 26467
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 ...