Search found 43 matches

by tiansk
09 Jun 2025, 04:31
Forum: Ring Tracking
Topic: intrabeam scattering with IBSCATTER
Replies: 4
Views: 8407

Re: intrabeam scattering with IBSCATTER

The change in the vertical emittance is shown in the figure below.
by tiansk
09 Jun 2025, 04:29
Forum: Ring Tracking
Topic: intrabeam scattering with IBSCATTER
Replies: 4
Views: 8407

Re: intrabeam scattering with IBSCATTER

Dear all: When using IBSCATTER to simulate the IBS effect, there is a parameter called SMOOTH in IBSCATTER. I believe that setting SMOOTH to 1 or 0 may result in different paths for the variation of beam parameters, but the final equilibrium state should be relatively consistent. However, after comp...
by tiansk
28 Apr 2025, 19:03
Forum: Ring Tracking
Topic: Calculation of Sliced Beam Parameters
Replies: 2
Views: 2989

Re: Calculation of Sliced Beam Parameters

Thank you for your detailed explanation. I understand the origin of the sqrt(4*PI) factor.
by tiansk
24 Apr 2025, 20:55
Forum: Ring Tracking
Topic: Calculation of Sliced Beam Parameters
Replies: 2
Views: 2989

Calculation of Sliced Beam Parameters

Hi, When using the IBSCATTER element for IBS simulation, under the condition of longitudinal slicing of the beam, how is the sliced bunch length statistically calculated? I checked the elegant source code and found that the sliced bunch length is given by “bLength = c_mks * tLength / sqrt(4 * PI)”. ...
by tiansk
09 Dec 2021, 21:25
Forum: Ring Tracking
Topic: Beam ion interaction using IONEFFECTS element
Replies: 17
Views: 167482

Re: Beam ion interaction using IONEFFECTS element

When I use multi-bunch train beam fillings, the column Sy & Sx in the ebeam file are 1 for NULL bucket, so : I'm not sure why you are getting any NULL/zero values here. Can you post the exact command you are using for makeBunchTrainWF, and your fill file? Hi,Joe: I may not have articulated my probl...
by tiansk
06 Dec 2021, 02:18
Forum: Ring Tracking
Topic: Beam ion interaction using IONEFFECTS element
Replies: 17
Views: 167482

Re: Beam ion interaction using IONEFFECTS element

Hi,Joe: Thank you for your explanation .I have another question about data processing, When I use multi-bunch train beam fillings, the column Sy & Sx in the ebeam file are 1 for NULL bucket, so : sddsprocess ion1.ebeam ion1.ebeam.break -redefine=col,ampy,"Cy abs Sy /" -redefine=col,ampx,"Cx abs Sx /...
by tiansk
19 Nov 2021, 01:13
Forum: Ring Tracking
Topic: Beam ion interaction using IONEFFECTS element
Replies: 17
Views: 167482

Re: Beam ion interaction using IONEFFECTS element

Hello Saroj, This series of commands will plot the average ion density of the APS ring: sddsprocess ion1.ionDens -pipe=out -process=qIons,last,qLast | sddscollapse -pipe | sddsbreak -pipe=in ion1.ionDens.break -decreaseOf=s sddsprocess ion1.ionDens.break -process=qLast,sum,qTot -process=Pass,first,...
by tiansk
03 Nov 2021, 10:12
Forum: Ring Tracking
Topic: Placement of IONEFFECTS elements
Replies: 7
Views: 16313

Re: Placement of IONEFFECTS elements

Hi Joe, Thank you. Then I guess I need to do some tests and see which positions I need to get convergence of the results. I also have another question now. I am trying to use the bigaussian fit and I haven't given any other values than the default. It seems to kind of work (I get histograms and fit...
by tiansk
18 Oct 2021, 02:38
Forum: Ring Tracking
Topic: Coupled motion between ions & e-beam simulation using ion_effects
Replies: 5
Views: 7763

Re: Coupled motion between ions & e-beam simulation using ion_effects

Hi Joe, Thank you for your replies. I have not yet catch on the simulation of the ion_effect. I now see the example 'ionEffects1' is an old version, the ion_effect has been updated several versions. Could you upload an ion_effect example of the new version? I still have a few questions: 1.Do I have ...
by tiansk
25 Sep 2021, 21:08
Forum: Ring Tracking
Topic: Coupled motion between ions & e-beam simulation using ion_effects
Replies: 5
Views: 7763

Re: Coupled motion between ions & e-beam simulation using ion_effects

Hi, Teresia: Thank you for your replies. I couldn't agree more with what you said: the trapping condition depends on beam size(beta function) that changed over the lattice, so the interaction points for simulation must be chosen carefully. But in my case, the beta function at the 10 and 1 interactio...