The OPAL Discussion Forum

[Christof Metzger-Kraus <christof.j.kraus AT gmail.com>]

Hi Youna,

backtracking currently doesn't work with traveling wave structures. When I implemented it I only tested it with standing wave cavities. The fix in the code is easy, but I don't know when there will be a new version including this fix. I'm sorry.

Best regards,

Christof

On Thu, Mar 26, 2020 at 7:08 PM Youna <ypark137 AT gmail.com> wrote:

Here are the input files.

 

Youna Park

 

From: Christof Metzger-Kraus
Sent: Thursday, March 26, 2020 12:59 PM
To: Youna
Cc: opal
Subject: Re: Re: [Opal] Fwd: Issue with Backtracking in OPAL

 

Hi Youna,

 

could you send me the input file and field maps?

 

Christof 

 

Youna <ypark137 AT gmail.com> schrieb am Do., 26. März 2020, 18:44:

If I switch ZSTART and ZSTOP, zstart still stays 0. What was your TRACK command  that worked?

 

 

 

Thanks,

 

Youna Park

 

From: Christof Metzger-Kraus
Sent: Thursday, March 26, 2020 3:17 AM
To: Youna Park
Cc: opal
Subject: Re: [Opal] Fwd: Issue with Backtracking in OPAL

 

Hi Youna,

 

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

 

Cheers, 

Christof 

 

Youna Park <ypark137 AT gmail.com> 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, 

 

Youna 

 

 

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

 

Hi Youna,

 

Could you email the OPAL mailing list with this?

 

Thanks,

 

--

Stephen Webb, PhD

Senior Research Scientist | RadiaSoft

720-502-3928 x 705 | swebb AT radiasoft.net

radiasoft.net | sirepo.com

 

 

On Tue, Mar 24, 2020 at 2:16 PM Adelmann Andreas (PSI) <andreas.adelmann AT psi.ch> wrote:

Hi Stephen, please send the problems to  opal AT lists.psi.ch. 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 radiasoft.net> 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.

 

Cheers,

--

Stephen Webb, PhD

Senior Research Scientist | RadiaSoft

720-502-3928 x 705 | swebb AT radiasoft.net

radiasoft.net | sirepo.com

<opal_backtracking.zip>