opal AT lists.psi.ch

Subject: The OPAL Discussion Forum

List archive

Re: [Opal] exception when runing optimizer

From: "Adelmann Andreas (PSI)" <andreas.adelmann AT psi.ch>
To: Philippe Piot <philippe.piot AT gmail.com>
Cc: "opal AT lists.psi.ch" <opal AT lists.psi.ch>, Christof Metzger-Kraus <christof.j.kraus AT gmail.com>
Subject: Re: [Opal] exception when runing optimizer
Date: Sun, 16 May 2021 20:25:38 +0000
Accept-language: en-US, de-CH
Authentication-results: localhost; iprev=pass (psi-seppmail1.ethz.ch) smtp.remote-ip=129.132.93.141; spf=pass smtp.mailfrom=psi.ch; dmarc=skipped

This sometimes happens when for example all particles are lost OR the beam is running backwards. In both

cases, as Christoph explained, the beam can not reach the s-pos where an objective value should be evaluated.

Cheers A

On 14 May 2021, at 16:11, Christof Metzger-Kraus <christof.j.kraus AT gmail.com> wrote:

Hi Philippe,

I think this means that the optimization doesn't reach the position of an objective when trying to interpolate the value from the SDDS file.

Christof

On Fri, May 14, 2021 at 1:32 PM Philippe Piot <philippe.piot AT gmail.com> wrote:

Dear All,

Could somebody tell me what is the meaning of the error message "Exception while getting value from SDDS file: all values < specified reference value" while running the optimizer.

I tried to grep this from the source but cannot locate it. I am especially wondering if this is just a warning I can ignore (and handled by the optimizer) or an error that has some consequence on my optimization.

Thank you, -- Philippe.

[Opal] exception when runing optimizer, Philippe Piot, 05/14/2021
- Re: [Opal] exception when runing optimizer, Christof Metzger-Kraus, 05/14/2021
  - Re: [Opal] exception when runing optimizer, Adelmann Andreas (PSI), 05/16/2021