Search found 54 matches

by marlibgin
19 May 2021, 18:53
Forum: General
Topic: duplicating a mmap file
Replies: 6
Views: 13308

duplicating a mmap file

Hi, it is probably already answered somewhere, and I may think there is an sdds command doing that. Anyway the problem is the following I calculate the mmap for a cell and I want then to create a mmap file by duplicating this cell Ntimes, so in the end I have the enre, symmetric lattice. Sorry for t...
by marlibgin
01 Dec 2020, 09:34
Forum: Parallel Elegant
Topic: Pelegant different method
Replies: 7
Views: 8853

Re: Pelegant different method

Hi, some time ago I posted about the use (and few issues) I had when using the parallel (swarm) optimizer. Thanks to the indications of the forum I had managed to make it run. In the meanwhile our cluster have been changed and ... I can't run it properly anymore. I am not sure whether this is a clus...
by marlibgin
13 Oct 2020, 05:57
Forum: Optimization and Matching
Topic: MOGA optimizer for rings
Replies: 24
Views: 44962

Re: MOGA optimizer for rings

A general question on MOGA in its common use, a set of machine parameters (typically harmonic sextupole families) can be utilized to target two objectives: lifetime and injection efficiency, for example. Has someone developed a way to use functions of machine parameters? e.g. my parameter is the bet...
by marlibgin
26 Jun 2020, 09:21
Forum: General
Topic: tuneshift with amplitude
Replies: 1
Views: 4104

tuneshift with amplitude

I have a general and trivial question I am trying to activate the calculation of the higher oder thune shifts with amplitude (dnux/daX2, dnuy/dAy2 etc) using a combination of tune_shift_with_amplitude and twiss_output commands. However while the linear terms are calculated, there all the higher orde...
by marlibgin
26 May 2020, 22:08
Forum: Parallel Elegant
Topic: Pelegant different method
Replies: 7
Views: 8853

Re: Pelegant different method

I have another question on this topics, which is a bit urgent in a way I am optimizing a lattice using the swarm optimizer in parallel mode In the case under study I do change gradients K1 and bending angles In the optimisation I can check mpipelegant.o<run_number> and see changes of ANGLEs happen ....
by marlibgin
10 May 2020, 21:16
Forum: Parallel Elegant
Topic: Pelegant different method
Replies: 7
Views: 8853

Re: Pelegant different method

Hi Michael sorry too for my belated answer. Only few days ago I went back to this, The example you sent me was very helpful, if only to check against a working case. From there I was able to understand why my code was "wrong": it was slow because I was demanding a large subdivision of element and al...
by marlibgin
02 Mar 2020, 05:32
Forum: Parallel Elegant
Topic: Pelegant different method
Replies: 7
Views: 8853

Pelegant different method

Hi all I used to use pelegant swarm methid with good perfromance, then I did not use it for quite a while. Recently I tried to re-vamp its use and discover is does not seem to perform "well". First it seems slow, though I am not sure why. While tryin gto understand this I I have checked what happene...
by marlibgin
20 Jan 2020, 14:09
Forum: General
Topic: Injection Efficiency
Replies: 4
Views: 5147

Injection Efficiency

Hi all I am trying something really simple ... on paper. Calculating the injection efficiency (IE) by counting the number of particles tracked after a certain number of turns This is part of a MOGA optimization where errors are introduced/propagated through different calculations The fragment where ...
by marlibgin
16 Jan 2020, 20:14
Forum: Optimization and Matching
Topic: MOGA optimizer for rings
Replies: 24
Views: 44962

Re: MOGA optimizer for rings

Hi all a general question on MOGA-elegant. Can someone remind me the relationship between nParents and childMultiplier parameters used in a typical sdds deck for an optimisation? I take a standard Example where these parameters are set to 4 and 4. Thanks SDDS1 ¶meter name=NumberCombined, descrip...
by marlibgin
27 Sep 2019, 04:49
Forum: General
Topic: modify global beam parameters
Replies: 1
Views: 2262

modify global beam parameters

Hi all
I have a very trivial question and I am a bit lost in the topics.
I would like to take a twiss ouptut file (.twi), modify (scan) the energy spread and save the new file
Is there a quick way to do this?

Thanks
Marco