The OPAL Discussion Forum

["Adelmann Andreas (PSI)" <andreas.adelmann AT psi.ch>]

Dear Huiwen yes at the moment we are doing maintenance.

@Chris: you correct me, but I think to remember that you are not free

in defining the fast changing dimension when writing the field map. If so

this could maybe be the problem?

Cheers Andreas 

------
Dr. sc. math. Andreas (Andy) Adelmann
Head a.i. Labor for Scientific Computing and Modelling 
Paul Scherrer Institut OHSA/D17 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Phone Home: xx41 62 891 91 44
-------------------------------------------------------
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 5 Jan 2019, at 10:32, Huiwen Koay <koay AT rcnp.osaka-u.ac.jp> wrote:

Dear Chris,

Please find attached with the fieldmap from tosca. (I updated the latest fieldmap)

For your information, gitlab.psi.ch/OPAL is currently running very slow here. Not sure if the site is having maintenance or upgrade. 

But I think I should have seen most of the SBEND3D examples given in the OPAL/wiki, none of them reflects my current problem.

"This error turns up when OPAL can't turn the field map into a regular grid. It can occur, for example, because of rounding errors when converting to a polar coordinate system (so the grid spacing looks irregular)."

In this case, do you have any suggestion to solve this problem?

Thank you very much.

Best regards,

Huiwen

On Sat, Jan 5, 2019 at 1:26 AM Adelmann Andreas (PSI) <andreas.adelmann AT psi.ch> wrote:

Hi Chris and Huiwen 

maybe the fast changing column in the field map is the wrong one. 

I guess the manual is not consistent with that. 

@Chris: the update I send you hopefully fix that.

Cheers Andreas 

------
Dr. sc. math. Andreas (Andy) Adelmann
Head a.i. Labor for Scientific Computing and Modelling 
Paul Scherrer Institut OHSA/D17 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Phone Home: xx41 62 891 91 44
-------------------------------------------------------
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 2 Jan 2019, at 11:30, Chris Rogers <chris.rogers AT stfc.ac.uk> wrote:

Hi Huiwen,
This error turns up when OPAL can't turn the field map into a regular grid. It can occur, for example, because of rounding errors when converting to a polar coordinate system (so the grid spacing looks irregular).

Could you please send me a copy of the field map file if it isn't too big (or put in on a drop box/equivalent if it is huge).

In case you didn't spot it, I would also like to draw your attention to the SBEND3D-based example lattice here:

https://gitlab.psi.ch/OPAL/src/wikis/FFA#tracking-through-an-3d-field-map

Regards,
Chris

On 02/01/2019 08:20, Adelmann Andreas (PSI) wrote:

to me this looks like a unit problem. what are the units of your
field map?
cheers A
------
Dr. sc. math. Andreas (Andy) Adelmann
Head a.i. Labor for Scientific Computing and Modelling
Paul Scherrer Institut OHSA/D17 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Phone Home: xx41 62 891 91 44
-------------------------------------------------------
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 2 Jan 2019, at 04:10, Huiwen Koay <koay AT rcnp.osaka-u.ac.jp<mailto:koay AT rcnp.osaka-u.ac.jp>> wrote:
Dear Andreas,
This is the error appeared in my shell.
<image.png>
Thank you again.
Best regards,
Huiwen
On Wed, Jan 2, 2019 at 5:41 AM Adelmann Andreas (PSI) <andreas.adelmann AT psi.ch<mailto:andreas.adelmann AT psi.ch>> wrote:
Hi Huiwen please add also the std-output so we see how OPAL
read your field map file.
Thanks Andreas
------
Dr. sc. math. Andreas (Andy) Adelmann
Head a.i. Labor for Scientific Computing and Modelling
Paul Scherrer Institut OHSA/D17 CH-5232 Villigen PSI
Phone Office: xx41 56 310 42 33 Fax: xx41 56 310 31 91
Phone Home: xx41 62 891 91 44
-------------------------------------------------------
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 31 Dec 2018, at 09:48, Snuverink Jochem (PSI) <jochem.snuverink AT psi.ch<mailto:jochem.snuverink AT psi.ch>> wrote:
Hi Huiwen,
I am forwarding your question to the OPAL mailing list. Can you add your input file?
Best regards,
Jochem
Begin forwarded message:
From: Huiwen Koay <koay AT rcnp.osaka-u.ac.jp<mailto:koay AT rcnp.osaka-u.ac.jp>>
Subject: Fieldmap error using OPAL-CYCL
Date: 30 December 2018 14:07:24 CET
To: <jochem.snuverink AT psi.ch<mailto:jochem.snuverink AT psi.ch>>
Dear  Jochem Snuverink,
Hi.
I am a new phd in beam physics trying to use OPAL for my AVF-cyclotron design.
I did my magnetic field study using OPERA3D, and would like to investigate the AEO and tune results. However, when I try to execute the input with parameters set using ringdefinition and sbend3d to read in the fmap file, I received error message as follow:
Error> *** User error detected by function "SectorMagneticFieldMap::IO::getInterpolator"
Error>     Ran out of field points during read operation; check bounds and ordering
It seems like the data size expected from the TOSCA file is different from the real input. According to the manual, we do not have to input anything else than the length and flux unit, so I thought the grid size of the input is defined as given by the header of the tosca output file. However, my prediction seem to be wrong.
Although I can convert the fmap format into other type, but this is the most convenient way. I would greatly appreciate if you have any suggestions to solve this problem.
Your soon reply is greatly appreciated.
Thank you very much.
Best regards,
Huiwen

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