The OPAL Discussion Forum

[jjyang <jianjun.yang AT psi.ch>]

Hi Andreas,

I think what John ask for is RK integrator in OPAL-T. But OPAL-CYCL has R-K time integrator. But one also need to set the time step manually.

Hi John, could you please clarify this ?

Jianjun Yang

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Post-doctoral
Massachusetts Institute of Technology

Work Address:
Paul Scherrer Institut   WBGB/125 
CH-5232 Villigen PSI Switzerland
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在 2012-5-4，下午9:21， Andreas Adelmann 写道：

Hello John, we are working on the adaptive scheme, a prototype is working fine. 

In the case of RF photo gun simulations we got very good improvements w.r.t. time

to solution, a paper is on the way on that. 

I can not yet tell you when this will be available in a released version, however I am 

confident that this will be a matter of weeks only.

With the possibility to use several tracks in one input file you can, without pain, 

switch to different time steps:

// Simulation of the gun with step size DT=1.0e-12

TRACK, LINE= Injector, BEAM=beam1, MAXSTEPS=100, DT=1.0e-12, ZSTOP=0.14;  

 RUN, METHOD = "PARALLEL-T", BEAM = beam1, FIELDSOLVER = Fs1, DISTRIBUTION = Dist1;

ENDTRACK;

// Simulation of the beam with step size DT=1.0e-11 

TRACK,LINE= Injector, BEAM=beam1, MAXSTEPS=50, DT=1.0e-11, ZSTOP=0.20;

 RUN, METHOD = "PARALLEL-T", BEAM=beam1, FIELDSOLVER=Fs1;

ENDTRACK;

Of course this is not adaptive!

Thanks for considering OPAL!

Cheers Andreas 

On May 4, 2012, at 5:55 PM, Power, John wrote:

Dear All,

 

I am looking for an alternative to PARMELA so I am lurking on your list. J

 

I see in the user’s manual that the Runge-Kutta time integrator is only available in OPAL-CYCL.  Since I work mostly with RF photoinjectors, and I would rather not have to set the time step manually as is done in PARMELA, I wonder if there are any near term plans to add this to OPAL-T since.

 

cheers,

John

------
Dr. sc. math. Andreas (Andy) Adelmann
Staff Scientist
Paul Scherrer Institut WBBA/219 CH-5232 Villigen PSI
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