opal AT lists.psi.ch
Subject: The OPAL Discussion Forum
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- From: Adelmann Andreas <andreas.adelmann AT psi.ch>
- To: Christopher Pierce <cmpierce AT uchicago.edu>
- Cc: "opal AT lists.psi.ch" <opal AT lists.psi.ch>
- Subject: Re: [Opal] quaternion isn't unit quaternion. Norm: -nan
- Date: Tue, 4 Apr 2023 10:44:08 +0000
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Hi Chris great that OPAL is of help to your research!
And yes your original field map is special :), indeed.
I can reproduce and confirm that with a small Ez component OPAL is
running well. I do not see however, the error you encountering. What version of OPAL
are you using?
Cheers A
------
Dr. sc. math. Andreas (Andy) Adelmann
Head a.i. Labor for Scientific Computing and Modelling
Paul Scherrer Institut OHSA/D09 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Zoom ID: 470-582-4086 Password: AdA
Zoom Link: https://ethz.zoom.us/j/4705824086?pwd=dFcvT1pMMGY0bHg0dTNncUNZZTJkZz09
-------------------------------------------------------
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
============================================
------
Dr. sc. math. Andreas (Andy) Adelmann
Head a.i. Labor for Scientific Computing and Modelling
Paul Scherrer Institut OHSA/D09 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Zoom ID: 470-582-4086 Password: AdA
Zoom Link: https://ethz.zoom.us/j/4705824086?pwd=dFcvT1pMMGY0bHg0dTNncUNZZTJkZz09
-------------------------------------------------------
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 4 Apr 2023, at 05:53, Christopher Pierce <cmpierce AT uchicago.edu> wrote:
Hey folks,
First, I have recently started using opal and wanted to thank you for it. It looks like it will be very useful for my research.
I am emailing because I am running into a problem with the attached input file. It is supposed to represent a beam in a artificial electrostatic focusing channel. I do this by loading a fieldmap into the simulation with a constant negative radially pointing E-field and no Ez component.
The problem I encounter is that after loading the input file, the program returns the error "quaternion isn't unit quaternion. Norm: -nan".
I found out that I can make the error go away by setting a single element of the fieldmap to have finite Ez (also attaching the file as "e-lens-fixed.T7". This fieldmap seems to give me the results I expect. Is there something that I am doing wrong here?
Cheers,
Chris Pierce<20230403-opal-focusing-channel.txt><e-lens.T7><e-lens-fixed.T7>
-
[Opal] quaternion isn't unit quaternion. Norm: -nan,
Christopher Pierce, 04/04/2023
-
Re: [Opal] quaternion isn't unit quaternion. Norm: -nan,
Adelmann Andreas, 04/04/2023
-
Re: [Opal] quaternion isn't unit quaternion. Norm: -nan,
Christopher Pierce, 04/04/2023
-
Re: [Opal] quaternion isn't unit quaternion. Norm: -nan,
Adelmann Andreas, 04/06/2023
-
Re: [Opal] quaternion isn't unit quaternion. Norm: -nan,
Christopher Pierce, 04/06/2023
-
Re: [Opal] quaternion isn't unit quaternion. Norm: -nan,
Adelmann Andreas, 04/07/2023
- Re: [Opal] quaternion isn't unit quaternion. Norm: -nan, Christopher Pierce, 04/11/2023
-
Re: [Opal] quaternion isn't unit quaternion. Norm: -nan,
Adelmann Andreas, 04/07/2023
-
Re: [Opal] quaternion isn't unit quaternion. Norm: -nan,
Christopher Pierce, 04/06/2023
-
Re: [Opal] quaternion isn't unit quaternion. Norm: -nan,
Adelmann Andreas, 04/06/2023
-
Re: [Opal] quaternion isn't unit quaternion. Norm: -nan,
Christopher Pierce, 04/04/2023
-
Re: [Opal] quaternion isn't unit quaternion. Norm: -nan,
Adelmann Andreas, 04/04/2023
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