Search found 38 matches

by SDastan
04 Aug 2022, 09:09
Forum: General
Topic: Implementation of bunch lengthning and transverse impedance
Replies: 10
Views: 10730

Re: Implementation of bunch lengthning and transverse impedance

Dear Michael, Thanks for the help. I increase the number of particles from 150,000 to 1,500,000 and it worked:) as below: 10000turn.jpg Based on the result can I announce 0.5 mA as the threshold current? Also, I try to know how the beam behaves in MWI. For this, I plotted t,p from the watch file for...
by SDastan
02 Aug 2022, 11:01
Forum: General
Topic: Implementation of bunch lengthning and transverse impedance
Replies: 10
Views: 10730

Re: Implementation of bunch lengthning and transverse impedance

Thanks Michael. I will try your suggestion. I have another question, I have some kind of handle in the bunch length during tracking. Can we consider them as microwave instability and is it usual that they disappear after some turns? 1000 Turns with 2 mA currents 2_1000.png 4000 Turns with 2 mA curre...
by SDastan
02 Aug 2022, 07:53
Forum: General
Topic: Implementation of bunch lengthning and transverse impedance
Replies: 10
Views: 10730

Re: Implementation of bunch lengthning and transverse impedance

Dear Michael, Thanks for your help. Finally, I increased the impedance budget and the resistive wall effect to achieve the logical behavior. But there is a question based on the result as I don't have the continuous increase in the energy spread, can I say that 2(mA) is a threshold current? increase...
by SDastan
27 Jul 2022, 08:35
Forum: General
Topic: Implementation of bunch lengthning and transverse impedance
Replies: 10
Views: 10730

Re: Implementation of bunch lengthning and transverse impedance

Dear Michael and all, I try to simulate the microwave instability by tracking in Elegant but I can't find any logical result by changing the current from 0 to 6 mA. I used ZLONG by these parameters: Rs=0.8 (ohm), f=7MGH and Q=1. It seems that the tracking doesn't see any instability or I made a mist...
by SDastan
30 Jun 2022, 06:19
Forum: Optimization and Matching
Topic: Beta Beating Correction in presence of errors
Replies: 7
Views: 6869

Beta Beating Correction in presence of errors

Dear all, I am doing optimization for the Elettra 2.0 lattice with MOGA in Elegant. I need to do beta beating correction after optimization and apply errors to compare the result with AT. I know there is a simplex method that matches the ref twiss function of bare lattice to perturbed ones, but it d...
by SDastan
31 May 2022, 01:53
Forum: Dynamic Aperture
Topic: km2sdds
Replies: 2
Views: 7453

Re: km2sdds

Dear Simona, Make sure that you are using the Radia and the the Mathematica notebook “RadiaToTrack” which is originally developed by the ESRF. The output .dat file of the programe easily convert to SDDS and you can use it in Elegant. See this page: https://www.esrf.fr/Accelerators/Groups/InsertionDe...
by SDastan
06 Apr 2019, 07:02
Forum: Optimization and Matching
Topic: MOGA optimizer for rings
Replies: 24
Views: 50933

Re: MOGA optimizer for rings

Hello every body,
Do you have any idea about the algorithm which is used for sorting results in this MOGA example? Is it NSGA-II?

regards,
Sara
by SDastan
03 Feb 2019, 03:55
Forum: Dynamic Aperture
Topic: Off-momentum DA
Replies: 3
Views: 14890

Re: Off-momentum DA

The example which is provided for off-momentum DA is fantastic and the Notebook file is really helpful. I just want to add a point that if you want to run the last step in the Notebook file, I mean postProcDA you should run the initial steps, I mean prepCase run4dDA run6dDA for more than two differe...
by SDastan
26 Jan 2019, 04:45
Forum: Dynamic Aperture
Topic: Off-momentum DA
Replies: 3
Views: 14890

Re: Off-momentum DA

Dear Michael,
The example that you made is fantastic and solve the problem.
Thank you so much.
Sara
by SDastan
21 Jan 2019, 08:49
Forum: Dynamic Aperture
Topic: Off-momentum DA
Replies: 3
Views: 14890

Off-momentum DA

Hello Michael and all, I want to track DA for off-momentum particles. I used the elegant example which is for off-momentum DA but I want to add some magnet errors, then I want to correct the orbit and close-orbit and finally track DA. I want to know should I increase the values like closed_orbit_acc...