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Re: [Opal] Fwd: Issue with Backtracking in OPAL

Chronological Thread 
  • From: Christof Metzger-Kraus <christof.j.kraus AT>
  • To: Youna Park <ypark137 AT>
  • Cc: opal <opal AT>
  • Subject: Re: [Opal] Fwd: Issue with Backtracking in OPAL
  • Date: Thu, 26 Mar 2020 09:17:32 +0100
  • Authentication-results: localhost; iprev=pass ( smtp.remote-ip=; spf=pass; dkim=pass header.s=20161025 header.a=rsa-sha256; dmarc=pass

Hi Youna,

did you try to set ZSTART=5.5 in the TRACK command? 


Youna Park <ypark137 AT> schrieb am Do., 26. März 2020, 09:12:
Hello Andreas,

I forward the OPAL mailing list this inquiry about backtracking. 
I don't have a figure to show since the output was not produced, but 
this is the output log (opal.o3447132 in the zip file):
The log says my version is 2.2.0. 
I don't know if my input was in the way that is supposed to be, what I wrote was the following: 

Thank you, 


---------- Forwarded message ---------
From: Stephen Webb <swebb AT>
Date: Tue, Mar 24, 2020 at 6:41 PM
Subject: Re: Issue with Backtracking in OPAL
Cc: Youna Park <ypark137 AT>

Hi Youna,

Could you email the OPAL mailing list with this?



Stephen Webb, PhD
Senior Research Scientist | RadiaSoft
720-502-3928 x 705 | swebb AT

On Tue, Mar 24, 2020 at 2:16 PM Adelmann Andreas (PSI) <andreas.adelmann AT> wrote:
Hi Stephen, please send the problems to  opal AT Besides the input files it 
would also be important to have the OPAl version together with some plots of the 
results/problems. This ensures that you get the fastest response. 

Cheers A
Dr. sc. math. Andreas (Andy) Adelmann
Head a.i. Labor for Scientific Computing and Modelling 
Paul Scherrer Institut OHSA/ CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Zoom ID: 470-582-4086
Friday: ETH HPK G 28   +41 44 633 3076
The more exotic, the more abstract the knowledge, 
the more profound will be its consequences.
Leon Lederman 

On 24 Mar 2020, at 17:59, Stephen Webb <swebb AT> wrote:

Hi Andreas,

I hope you're staying well during all this.

I passed along the OPAL examples for Sirepo to our development team, so they should end up in the Examples directory soon.

Chris Hall and I have been working with Youna Park (UCLA grad student, cc'd) for modeling an injector + APS linac for an experiment. Youna has been doing backtracking work, but ran into a hitch with OPAL where we are not seeing files dumped after backtracking from the end of the gun to the beginning. I have attached the simulation files.

Any idea what the trouble might be? If you have any detailed questions about the simulation, it's probably best to ask Youna.

Thanks for your help.


Stephen Webb, PhD
Senior Research Scientist | RadiaSoft
720-502-3928 x 705 | swebb AT

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